mirror of
https://github.com/heygen-com/hyperframes.git
synced 2026-09-03 04:38:33 +00:00
Miguel Ángel
48f158a0c2
* perf(engine): one-pass SDR-to-HDR extraction with cache-key transform Mixed-HDR compositions converted each SDR source with a full libx264 re-encode (convertSdrToHdr) before extraction. The BT.709 to BT.2020 colorspace remap now runs as a filter inside the extraction pass itself; convertSdrToHdr and the _hdr_normalized intermediate are deleted. Same shape as the earlier one-pass VFR change. Also fixes a cache-poisoning bug this exposed: the HDR preflight rewrote entry.videoPath AFTER the cache-key snapshot, so a mixed-HDR render cached converted frames under the plain source key and a later SDR render of the same trim would have served HDR-tinted frames. The cache key now carries an optional transform discriminator; keys without a transform stay byte-compatible with existing entries. * fix(engine): attribute SDR-to-HDR extract failures, pin filter-order intent Review hardening for one-pass SDR-to-HDR: - ffmpeg failures now carry an 'SDR→HDR conversion failed (colorspace filter in extract pass)' prefix when the remap is in the chain, so a filter-less ffmpeg build fails loudly with attribution instead of a generic extract error. - Comments pin the fps-before-colorspace ordering intent and mark sdrToHdrTransfers as the canonical read for both the cache key and extraction options. - Cross-render cache-poisoning regression test now compares frame BYTES across the cache boundary: mixed-HDR render then plain-SDR render of the same trim must produce different pixels, and a repeat plain render must hit the plain entry with byte-identical frames.
1156 lines
42 KiB
TypeScript
1156 lines
42 KiB
TypeScript
// fallow-ignore-file unused-class-member code-duplication complexity
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/**
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* Video Frame Extractor Service
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*
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* Pre-extracts video frames using FFmpeg for frame-accurate rendering.
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* Videos are replaced with <img> elements during capture.
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*/
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import { spawn } from "child_process";
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import { existsSync, mkdirSync, readdirSync, rmSync } from "fs";
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import { isAbsolute, join, posix, resolve, sep } from "path";
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import { parseHTML } from "linkedom";
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import { decodeUrlPathVariants, MEDIA_DURATION_CLAMP_EPSILON_SECONDS } from "@hyperframes/core";
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import { trackChildProcess } from "../utils/processTracker.js";
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import { extractMediaMetadata, type VideoMetadata } from "../utils/ffprobe.js";
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import {
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analyzeCompositionHdr,
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isHdrColorSpace as isHdrColorSpaceUtil,
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type HdrTransfer,
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} from "../utils/hdr.js";
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import { downloadToTemp, isHttpUrl } from "../utils/urlDownloader.js";
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import { getFfmpegBinary } from "../utils/ffmpegBinaries.js";
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import { DEFAULT_CONFIG, type EngineConfig } from "../config.js";
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import { unwrapTemplate } from "../utils/htmlTemplate.js";
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import {
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FRAME_FILENAME_PREFIX,
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gcExtractionCache,
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lookupCacheEntry,
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partialCacheEntryDir,
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publishCacheEntry,
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readKeyStat,
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rehydrateCacheEntry,
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touchCacheEntry,
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type CacheFrameFormat,
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} from "./extractionCache.js";
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export interface VideoElement {
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id: string;
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src: string;
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start: number;
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end: number;
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mediaStart: number;
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loop: boolean;
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hasAudio: boolean;
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}
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export interface ExtractedFrames {
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videoId: string;
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srcPath: string;
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outputDir: string;
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framePattern: string;
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fps: number;
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totalFrames: number;
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metadata: VideoMetadata;
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framePaths: Map<number, string>;
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/**
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* True when the extractor owns `outputDir` and cleanup should rm it when
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* the render ends. Cache hits set this to false so the shared entry isn't
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* deleted by a single render's cleanup — the cache dir is owned by the
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* caller's gc policy, not any one render.
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*/
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ownedByLookup?: boolean;
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}
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/**
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* The single source of truth for the source-video frame-extraction allow-list.
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* The CLI flag parser, the producer HTTP server, and the distributed-config
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* validator all validate against this same set via {@link isVideoFrameFormat}
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* so the boundaries can't drift when a new format is added.
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*/
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export const VIDEO_FRAME_FORMATS = ["auto", "jpg", "png"] as const;
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export type VideoFrameFormat = (typeof VIDEO_FRAME_FORMATS)[number];
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/** Runtime guard for {@link VideoFrameFormat} over an untrusted value. */
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export function isVideoFrameFormat(value: unknown): value is VideoFrameFormat {
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return typeof value === "string" && (VIDEO_FRAME_FORMATS as readonly string[]).includes(value);
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}
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export interface ExtractionOptions {
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fps: number;
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outputDir: string;
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quality?: number;
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format?: VideoFrameFormat;
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sdrToHdrTransfer?: HdrTransfer;
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}
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const EXTRACT_CACHE_MIN_AGE_MS = 60 * 60 * 1000;
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const SDR_TO_HDR_COLORSPACE_FILTER = "colorspace=all=bt2020:iall=bt709:range=tv";
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function sdrToHdrTransformKey(transfer: HdrTransfer): string {
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return `sdr2hdr-${transfer}`;
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}
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/**
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* Per-phase timings and counters emitted by `extractAllVideoFrames`.
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*
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* Used by the producer to surface `perfSummary.videoExtractBreakdown` — without
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* this breakdown, a single `videoExtractMs` stage timing hides where cost lives
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* (HDR preflight, VFR classification, per-video ffmpeg extract) when tuning renders.
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*
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* Field semantics:
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* - *Ms fields are wall-clock durations inside each phase.
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* - *Count fields report how many sources triggered that phase.
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* - extractMs wraps the parallel `extractVideoFramesRange` calls; it
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* reflects max-across-parallel-workers, not sum.
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* - hdrPreflightMs includes its probe-time sibling (hdrProbeMs); the
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* probe-only field is a finer decomposition, not a separate carve-out.
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* - vfrPreflightCount reports sources classified as VFR and routed through
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* the one-pass `-fps_mode cfr -r` extraction path. DEFINITION CHANGE:
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* before the one-pass refactor, vfrPreflightMs timed a per-source
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* VFR-to-CFR re-encode and could reach seconds; it now times only the
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* (promise-cached) classification probe and is expected to be ~0.
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* Dashboards alerting on vfrPreflightMs thresholds should key on
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* vfrPreflightCount or extractMs instead.
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*/
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export interface ExtractionPhaseBreakdown {
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resolveMs: number;
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/** Publishes that could not land atomically — the render still succeeded
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* from the partial dir, but future renders re-extract. A rising rate is
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* the first signal that warm renders are silently going cold. */
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cachePublishFailures: number;
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/** Entries evicted by the post-extraction LRU sweep. */
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cacheGcEvictions: number;
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/** Bytes reclaimed by the LRU sweep. */
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cacheGcBytesFreed: number;
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/** Aged .partial-* dirs (crashed writers) removed by the sweep. */
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cacheAgedPartialsCleared: number;
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hdrProbeMs: number;
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hdrPreflightMs: number;
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hdrPreflightCount: number;
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vfrProbeMs: number;
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vfrPreflightMs: number;
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vfrPreflightCount: number;
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extractMs: number;
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cacheHits: number;
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cacheMisses: number;
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}
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export interface ExtractionResult {
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success: boolean;
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extracted: ExtractedFrames[];
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errors: Array<{ videoId: string; error: string }>;
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totalFramesExtracted: number;
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durationMs: number;
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phaseBreakdown: ExtractionPhaseBreakdown;
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}
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export function parseVideoElements(html: string): VideoElement[] {
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const videos: VideoElement[] = [];
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const { document } = parseHTML(unwrapTemplate(html));
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const videoEls = document.querySelectorAll("video[src]");
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let autoIdCounter = 0;
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for (const el of videoEls) {
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const src = el.getAttribute("src");
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if (!src) continue;
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// Generate a stable ID for videos without one — the producer needs IDs
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// to track extracted frames and composite them during encoding.
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const id = el.getAttribute("id") || `hf-video-${autoIdCounter++}`;
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if (!el.getAttribute("id")) {
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el.setAttribute("id", id);
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}
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const startAttr = el.getAttribute("data-start");
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const endAttr = el.getAttribute("data-end");
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const durationAttr = el.getAttribute("data-duration");
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const mediaStartAttr = el.getAttribute("data-media-start");
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const hasAudioAttr = el.getAttribute("data-has-audio");
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const start = startAttr ? parseFloat(startAttr) : 0;
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// Derive end from data-end → data-start+data-duration → Infinity (natural duration).
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// The caller (htmlCompiler) clamps Infinity to the composition's absoluteEnd.
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let end = 0;
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if (endAttr) {
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end = parseFloat(endAttr);
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} else if (durationAttr) {
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end = start + parseFloat(durationAttr);
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} else {
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end = Infinity; // no explicit bounds — play for the full natural video duration
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}
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videos.push({
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id,
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src,
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start,
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end,
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mediaStart: mediaStartAttr ? parseFloat(mediaStartAttr) : 0,
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loop: el.hasAttribute("loop"),
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hasAudio: hasAudioAttr === "true",
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});
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}
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return videos;
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}
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export interface ImageElement {
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id: string;
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src: string;
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start: number;
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end: number;
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}
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export function parseImageElements(html: string): ImageElement[] {
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const images: ImageElement[] = [];
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const { document } = parseHTML(unwrapTemplate(html));
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const imgEls = document.querySelectorAll("img[src]");
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let autoIdCounter = 0;
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for (const el of imgEls) {
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const src = el.getAttribute("src");
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if (!src) continue;
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const id = el.getAttribute("id") || `hf-img-${autoIdCounter++}`;
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if (!el.getAttribute("id")) {
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el.setAttribute("id", id);
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}
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const startAttr = el.getAttribute("data-start");
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const endAttr = el.getAttribute("data-end");
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const durationAttr = el.getAttribute("data-duration");
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const start = startAttr ? parseFloat(startAttr) : 0;
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let end = 0;
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if (endAttr) {
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end = parseFloat(endAttr);
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} else if (durationAttr) {
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end = start + parseFloat(durationAttr);
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} else {
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end = Infinity;
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}
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images.push({ id, src, start, end });
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}
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return images;
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}
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export async function extractVideoFramesRange(
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videoPath: string,
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videoId: string,
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startTime: number,
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duration: number,
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options: ExtractionOptions,
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signal?: AbortSignal,
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config?: Partial<Pick<EngineConfig, "ffmpegProcessTimeout">>,
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/**
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* Override the output directory for this extraction. When provided, frames
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* are written directly into `outputDirOverride` (no per-videoId subdir).
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* Used by the cache layer to materialize frames straight into the keyed
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* cache entry directory.
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*/
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outputDirOverride?: string,
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): Promise<ExtractedFrames> {
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const ffmpegProcessTimeout = config?.ffmpegProcessTimeout ?? DEFAULT_CONFIG.ffmpegProcessTimeout;
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const { fps, outputDir, quality = 95 } = options;
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const videoOutputDir = outputDirOverride ?? join(outputDir, videoId);
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if (!existsSync(videoOutputDir)) mkdirSync(videoOutputDir, { recursive: true });
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const metadata = await extractMediaMetadata(videoPath);
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const format = resolveFrameFormat(metadata, options.format);
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const framePattern = `${FRAME_FILENAME_PREFIX}%05d.${format}`;
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const outputPattern = join(videoOutputDir, framePattern);
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// When extracting from HDR source, tone-map to SDR in FFmpeg rather than
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// letting Chrome's uncontrollable tone-mapper handle it (which washes out).
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// macOS: VideoToolbox hardware decoder does HDR→SDR natively on Apple Silicon.
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// Linux: zscale filter (when available) or colorspace filter as fallback.
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const isHdr = isHdrColorSpaceUtil(metadata.colorSpace);
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const isMacOS = process.platform === "darwin";
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const args: string[] = [];
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if (isHdr && isMacOS) {
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args.push("-hwaccel", "videotoolbox");
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}
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// Always force the alpha-aware decoder on codecs that can carry alpha. The
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// alternative — gating on `metadata.hasAlpha` — relies on tag detection that
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// has at least three known failure modes: case-sensitivity across ffmpeg
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// versions (`alpha_mode` vs `ALPHA_MODE`), missing tags from older muxers,
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// and mp4-as-webm rewraps that drop the sidecar. A wrong negative there
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// silently strips alpha during decode and the bug doesn't surface until
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// the rendered video is missing layers. Codec-based default has no such
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// ambiguity: libvpx-vp9 reads the alpha sidecar when present and decodes
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// normally when it isn't.
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if (codecMayHaveAlpha(metadata.videoCodec)) {
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args.push("-c:v", decoderForCodec(metadata.videoCodec));
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}
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args.push("-ss", String(startTime), "-i", videoPath, "-t", String(duration));
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const vfFilters: string[] = [];
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if (isHdr && isMacOS) {
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// VideoToolbox tone-maps during decode; force output to bt709 SDR format
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vfFilters.push("format=nv12");
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}
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if (!metadata.isVFR) {
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vfFilters.push(`fps=${fps}`);
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}
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if (options.sdrToHdrTransfer) {
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// Ordering intent: fps sampling runs BEFORE the colorspace remap so only
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// kept frames are converted. The remap is pointwise per-frame, so the
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// output is identical either way for the SDR (BT.709, 8-bit) inputs this
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// flag is set for. If format=nv12 (macOS HDR-source decode) ever combines
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// with this flag, revisit: nv12 subsampling before a BT.2020 remap is an
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// untested interaction (today the flags are mutually exclusive — the
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// remap only applies to SDR sources, nv12 only to HDR sources).
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vfFilters.push(SDR_TO_HDR_COLORSPACE_FILTER);
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}
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if (vfFilters.length > 0) args.push("-vf", vfFilters.join(","));
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if (metadata.isVFR) args.push("-fps_mode", "cfr", "-r", String(fps));
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args.push("-q:v", format === "jpg" ? String(Math.ceil((100 - quality) / 3)) : "0");
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// Render-scoped temp frames are read once; level 1 measured 3-5x faster for ~14% larger files.
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if (format === "png") args.push("-compression_level", "1");
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args.push("-y", outputPattern);
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return new Promise((resolve, reject) => {
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const ffmpeg = spawn(getFfmpegBinary(), args);
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trackChildProcess(ffmpeg);
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let stderr = "";
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const onAbort = () => {
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ffmpeg.kill("SIGTERM");
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};
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if (signal) {
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if (signal.aborted) {
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ffmpeg.kill("SIGTERM");
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} else {
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signal.addEventListener("abort", onAbort, { once: true });
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}
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}
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const timer = setTimeout(() => {
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ffmpeg.kill("SIGTERM");
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}, ffmpegProcessTimeout);
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ffmpeg.stderr.on("data", (data) => {
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stderr += data.toString();
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});
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ffmpeg.on("close", (code) => {
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clearTimeout(timer);
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if (signal) signal.removeEventListener("abort", onAbort);
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if (signal?.aborted) {
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reject(new Error("Video frame extraction cancelled"));
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return;
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}
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if (code !== 0) {
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// With the SDR-to-HDR remap folded into this pass, a filter failure
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// (e.g. an ffmpeg built without the colorspace filter) would otherwise
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// surface as a generic extract error and the operator has to grep the
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// filter chain to learn it was the HDR conversion. Attribute it.
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const hdrPrefix = options.sdrToHdrTransfer
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? `SDR→HDR conversion failed (colorspace filter in extract pass, target ${options.sdrToHdrTransfer}): `
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: "";
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reject(new Error(`${hdrPrefix}FFmpeg exited with code ${code}: ${stderr.slice(-500)}`));
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return;
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}
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const framePaths = new Map<number, string>();
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const files = readdirSync(videoOutputDir)
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.filter((f) => f.startsWith(FRAME_FILENAME_PREFIX) && f.endsWith(`.${format}`))
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.sort();
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files.forEach((file, index) => {
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framePaths.set(index, join(videoOutputDir, file));
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});
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resolve({
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videoId,
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srcPath: videoPath,
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outputDir: videoOutputDir,
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framePattern,
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fps,
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totalFrames: framePaths.size,
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metadata,
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framePaths,
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});
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});
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ffmpeg.on("error", (err) => {
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clearTimeout(timer);
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if (signal) signal.removeEventListener("abort", onAbort);
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if ((err as NodeJS.ErrnoException).code === "ENOENT") {
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reject(new Error("[FFmpeg] ffmpeg not found"));
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} else {
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reject(err);
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}
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});
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});
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}
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/**
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* Resolve the used-segment duration for a video, falling back to the source's
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* natural duration when the caller hasn't specified bounds (end=Infinity) or
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* the bounds are nonsensical (end<=start).
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*/
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function resolveSegmentDuration(
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requested: number,
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mediaStart: number,
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metadata: VideoMetadata,
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): number {
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if (Number.isFinite(requested) && requested > 0) return requested;
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const sourceRemaining = metadata.durationSeconds - mediaStart;
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return sourceRemaining > 0 ? sourceRemaining : metadata.durationSeconds;
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}
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/**
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* Codecs whose bitstream is allowed to carry an alpha channel. Default the
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* extraction path to PNG output for these regardless of `metadata.hasAlpha`
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* so a missed sidecar tag doesn't silently strip transparency. Opaque content
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* encoded in one of these codecs pays a small file-size cost on the cached
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* frames but stays correct on the rare case where alpha IS present and the
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* tag was missed.
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*/
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const ALPHA_CAPABLE_CODECS = new Set(["vp9", "vp8", "prores"]);
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export function codecMayHaveAlpha(codec: string | undefined): boolean {
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return ALPHA_CAPABLE_CODECS.has((codec ?? "").toLowerCase());
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}
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export function decoderForCodec(codec: string | undefined): string {
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const c = (codec ?? "").toLowerCase();
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if (c === "vp9") return "libvpx-vp9";
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if (c === "vp8") return "libvpx";
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return c;
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}
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export function resolveFrameFormat(
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metadata: VideoMetadata,
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requested?: VideoFrameFormat,
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): CacheFrameFormat {
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if (metadata.hasAlpha || codecMayHaveAlpha(metadata.videoCodec)) return "png";
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if (requested === "png" || requested === "jpg") return requested;
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return "jpg";
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}
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/**
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* Resolve a relative `<video src>` to a filesystem path the way the browser
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* resolves it as a URL. Browsers clamp `..` segments at the served origin's
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* root; `path.join(projectDir, "../assets/foo")` does not. So a sub-comp
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|
* `<video src="../assets/foo">` loads in the page (browser clamps to
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* `<projectDir>/assets/foo`) but the filesystem-side resolver lands at
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* `<parentOfProjectDir>/assets/foo` — file missing, extraction skipped,
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* the rendered output shows the video's first frame for the whole clip.
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*
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* The clamp covers two escape patterns: leading `..` (`../assets/foo`) AND
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* mid-path escapes (`assets/../../foo`) that `path.join` collapses past the
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* project root silently. Both fall back to a project-rooted candidate that
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* strips traversal from the resolved path.
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*
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* Returns the first existing candidate, or the base-dir join on miss so
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* the caller's `existsSync` check produces a stable error path.
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*/
|
|
export function resolveProjectRelativeSrc(
|
|
src: string,
|
|
baseDir: string,
|
|
compiledDir?: string,
|
|
): string {
|
|
const qIdx = src.indexOf("?");
|
|
const cleanSrc = qIdx >= 0 ? src.slice(0, qIdx) : src;
|
|
const candidates: string[] = [];
|
|
|
|
const addCandidate = (candidate: string): void => {
|
|
if (!candidates.includes(candidate)) candidates.push(candidate);
|
|
};
|
|
|
|
for (const variant of decodeUrlPathVariants(cleanSrc)) {
|
|
const fromCompiled = compiledDir ? join(compiledDir, variant) : null;
|
|
const fromBase = join(baseDir, variant);
|
|
|
|
// If the joined result escapes the project root (either via leading `..`
|
|
// or mid-path traversal that path.join collapsed past baseDir), retry
|
|
// with the basename re-anchored at the project root. This mirrors the
|
|
// browser URL clamp without relying on a particular `..` shape.
|
|
const baseAbs = resolve(baseDir);
|
|
const fromBaseAbs = resolve(fromBase);
|
|
if (!fromBaseAbs.startsWith(baseAbs + sep) && fromBaseAbs !== baseAbs) {
|
|
// Normalize first (`assets/../../assets/foo.mp4` → `../assets/foo.mp4`)
|
|
// then strip any remaining leading `..` segments. Stripping `..` from the
|
|
// raw input would leave dangling siblings (`assets/../../assets/foo`
|
|
// would become `assets/assets/foo` instead of `assets/foo`).
|
|
const normalized = posix.normalize(variant.replace(/\\/g, "/"));
|
|
const stripped = normalized.replace(/^(\.\.\/)+/, "");
|
|
if (stripped && stripped !== variant && !stripped.startsWith("..")) {
|
|
if (compiledDir) addCandidate(join(compiledDir, stripped));
|
|
addCandidate(join(baseDir, stripped));
|
|
}
|
|
}
|
|
|
|
if (fromCompiled) addCandidate(fromCompiled);
|
|
addCandidate(fromBase);
|
|
}
|
|
return candidates.find(existsSync) ?? join(baseDir, cleanSrc);
|
|
}
|
|
|
|
export async function extractAllVideoFrames(
|
|
videos: VideoElement[],
|
|
baseDir: string,
|
|
options: ExtractionOptions,
|
|
signal?: AbortSignal,
|
|
config?: Partial<
|
|
Pick<EngineConfig, "ffmpegProcessTimeout" | "extractCacheDir" | "extractCacheMaxBytes">
|
|
>,
|
|
compiledDir?: string,
|
|
): Promise<ExtractionResult> {
|
|
const startTime = Date.now();
|
|
const extracted: ExtractedFrames[] = [];
|
|
const errors: Array<{ videoId: string; error: string }> = [];
|
|
let totalFramesExtracted = 0;
|
|
const breakdown: ExtractionPhaseBreakdown = {
|
|
resolveMs: 0,
|
|
cachePublishFailures: 0,
|
|
cacheGcEvictions: 0,
|
|
cacheGcBytesFreed: 0,
|
|
cacheAgedPartialsCleared: 0,
|
|
hdrProbeMs: 0,
|
|
hdrPreflightMs: 0,
|
|
hdrPreflightCount: 0,
|
|
vfrProbeMs: 0,
|
|
vfrPreflightMs: 0,
|
|
vfrPreflightCount: 0,
|
|
extractMs: 0,
|
|
cacheHits: 0,
|
|
cacheMisses: 0,
|
|
};
|
|
|
|
// Phase 1: Resolve paths and download remote videos
|
|
const phase1Start = Date.now();
|
|
const resolvedVideos: Array<{ video: VideoElement; videoPath: string }> = [];
|
|
// Dedupe missing-src warnings: a composition with N <video> elements all
|
|
// pointing at the same broken src should only print one warning, not N.
|
|
const warnedSrcs = new Set<string>();
|
|
for (const video of videos) {
|
|
if (signal?.aborted) break;
|
|
try {
|
|
let videoPath = video.src;
|
|
// Use isAbsolute() rather than startsWith("/"). On Windows, absolute paths
|
|
// like "C:\…" are not detected by the latter, so we'd re-join them under
|
|
// baseDir and produce duplicated, nonexistent paths
|
|
// (e.g. C:\tmp\hf-vfr-test-X\C:\tmp\hf-vfr-test-X\vfr_screen.mp4).
|
|
if (!isAbsolute(videoPath) && !isHttpUrl(videoPath)) {
|
|
videoPath = resolveProjectRelativeSrc(video.src, baseDir, compiledDir);
|
|
}
|
|
|
|
if (isHttpUrl(videoPath)) {
|
|
const downloadDir = join(options.outputDir, "_downloads");
|
|
mkdirSync(downloadDir, { recursive: true });
|
|
videoPath = await downloadToTemp(videoPath, downloadDir);
|
|
}
|
|
|
|
if (!existsSync(videoPath)) {
|
|
// Loud: silent miss leaves the rendered video frozen at frame 0 with
|
|
// no error in stdout — extremely confusing for authors. Dedupe by
|
|
// src so 50 broken videos pointing at the same path don't spam.
|
|
if (!warnedSrcs.has(video.src)) {
|
|
warnedSrcs.add(video.src);
|
|
process.stderr.write(
|
|
`[hyperframes:render] WARNING: video src="${video.src}" ` +
|
|
`could not be resolved on disk (looked for ${videoPath}). ` +
|
|
`The rendered output will show this video's first frame for the entire clip duration. ` +
|
|
`If your <video> lives inside a sub-composition, prefer project-root-relative paths ` +
|
|
`(e.g. src="assets/foo.mp4") over "../assets/foo.mp4".\n`,
|
|
);
|
|
}
|
|
errors.push({ videoId: video.id, error: `Video file not found: ${videoPath}` });
|
|
continue;
|
|
}
|
|
resolvedVideos.push({ video, videoPath });
|
|
} catch (err) {
|
|
errors.push({ videoId: video.id, error: err instanceof Error ? err.message : String(err) });
|
|
}
|
|
}
|
|
|
|
breakdown.resolveMs = Date.now() - phase1Start;
|
|
|
|
// Snapshot the pre-preflight key inputs so the extraction cache keys on the
|
|
// user-visible source (original path, original mediaStart, original segment
|
|
// bounds) rather than the workDir-local normalized file produced by the
|
|
// HDR preflight. Without this, every render would write a new
|
|
// normalized file with a fresh mtime → fresh cache key → perpetual misses.
|
|
const cacheKeyInputs = resolvedVideos.map(({ video, videoPath }) => {
|
|
const stat = readKeyStat(videoPath);
|
|
// Missing files return null — skip the cache path for that entry. The
|
|
// extractor will surface the real file-not-found error downstream, and we
|
|
// avoid polluting the cache with a `(mtimeMs: 0, size: 0)` tuple that two
|
|
// unrelated missing paths would otherwise share.
|
|
if (!stat) return null;
|
|
return {
|
|
videoPath,
|
|
mtimeMs: stat.mtimeMs,
|
|
size: stat.size,
|
|
mediaStart: video.mediaStart,
|
|
start: video.start,
|
|
end: video.end,
|
|
};
|
|
});
|
|
|
|
// Phase 2: Probe color spaces and normalize if mixed HDR/SDR
|
|
const phase2ProbeStart = Date.now();
|
|
const videoMetadata = await Promise.all(
|
|
resolvedVideos.map(({ videoPath }) => extractMediaMetadata(videoPath)),
|
|
);
|
|
const videoColorSpaces = videoMetadata.map((m) => m.colorSpace);
|
|
// Canonical per-index record of the SDR-to-HDR transform decision. BOTH the
|
|
// cache key (transform discriminator) and the extraction options read from
|
|
// this array via the prepared work items — never set one side independently
|
|
// or cache lookups and written frames drift apart (the poisoning bug this
|
|
// field exists to fix).
|
|
const sdrToHdrTransfers: Array<HdrTransfer | undefined> = resolvedVideos.map(() => undefined);
|
|
breakdown.hdrProbeMs = Date.now() - phase2ProbeStart;
|
|
|
|
const hdrPreflightStart = Date.now();
|
|
const hdrInfo = analyzeCompositionHdr(videoColorSpaces);
|
|
// Track entries the HDR preflight validated as non-extractable so they can
|
|
// be removed from every parallel array before Phase 2b and Phase 3 see them.
|
|
// Without this, `errors.push({...}); continue;` only short-circuits the
|
|
// normalization step — the invalid entry stays in `resolvedVideos` and
|
|
// Phase 3 still calls `extractVideoFramesRange` on the same past-EOF
|
|
// mediaStart, surfacing a second raw FFmpeg error for the same clip.
|
|
const hdrSkippedIndices = new Set<number>();
|
|
if (hdrInfo.hasHdr && hdrInfo.dominantTransfer) {
|
|
// dominantTransfer is "majority wins" — if a composition mixes PQ and HLG
|
|
// sources (rare but legal), the minority transfer's videos get converted
|
|
// with the wrong curve. We treat this as caller-error: a single composition
|
|
// should not mix PQ and HLG sources, the orchestrator picks one transfer
|
|
// for the whole render, and any source not on that curve is normalized to
|
|
// it. If you need both transfers, render two separate compositions.
|
|
const targetTransfer = hdrInfo.dominantTransfer;
|
|
|
|
for (let i = 0; i < resolvedVideos.length; i++) {
|
|
if (signal?.aborted) break;
|
|
const cs = videoColorSpaces[i] ?? null;
|
|
if (!isHdrColorSpaceUtil(cs)) {
|
|
// SDR video in a mixed timeline — extract through a BT.709→BT.2020
|
|
// colorspace filter so the encoder tags the final video correctly
|
|
// (PQ vs HLG) without a separate normalized intermediate.
|
|
const entry = resolvedVideos[i];
|
|
const metadata = videoMetadata[i];
|
|
if (!entry || !metadata) continue;
|
|
|
|
// Guard against mediaStart past EOF — FFmpeg's `-ss` silently produces
|
|
// a 0-byte file when seeking beyond the source duration, and the
|
|
// downstream extractor then points at a broken input.
|
|
if (entry.video.mediaStart >= metadata.durationSeconds) {
|
|
errors.push({
|
|
videoId: entry.video.id,
|
|
error: `SDR→HDR conversion skipped: mediaStart (${entry.video.mediaStart}s) ≥ source duration (${metadata.durationSeconds}s)`,
|
|
});
|
|
hdrSkippedIndices.add(i);
|
|
continue;
|
|
}
|
|
|
|
sdrToHdrTransfers[i] = targetTransfer;
|
|
breakdown.hdrPreflightCount += 1;
|
|
}
|
|
}
|
|
}
|
|
breakdown.hdrPreflightMs = Date.now() - hdrPreflightStart;
|
|
|
|
// Remove HDR-preflight-skipped entries from every parallel array so Phase 2b
|
|
// (VFR classification) and Phase 3 (extract) don't re-process them. Iterate
|
|
// backwards to keep indices stable while splicing.
|
|
if (hdrSkippedIndices.size > 0) {
|
|
for (let i = resolvedVideos.length - 1; i >= 0; i--) {
|
|
if (hdrSkippedIndices.has(i)) {
|
|
resolvedVideos.splice(i, 1);
|
|
videoMetadata.splice(i, 1);
|
|
videoColorSpaces.splice(i, 1);
|
|
// Added by the extraction-cache commit: keep cacheKeyInputs aligned
|
|
// with the other parallel arrays so Phase 3's `cacheKeyInputs[i]`
|
|
// lookup doesn't point at a stale slot after the splice.
|
|
cacheKeyInputs.splice(i, 1);
|
|
sdrToHdrTransfers.splice(i, 1);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Phase 2b: Keep VFR observability while routing VFR inputs through the
|
|
// one-pass CFR extraction path in Phase 3.
|
|
const vfrPreflightStart = Date.now();
|
|
for (let i = 0; i < resolvedVideos.length; i++) {
|
|
if (signal?.aborted) break;
|
|
const entry = resolvedVideos[i];
|
|
if (!entry) continue;
|
|
const vfrProbeStart = Date.now();
|
|
const metadata = await extractMediaMetadata(entry.videoPath);
|
|
breakdown.vfrProbeMs += Date.now() - vfrProbeStart;
|
|
if (metadata.isVFR) breakdown.vfrPreflightCount += 1;
|
|
}
|
|
breakdown.vfrPreflightMs = Date.now() - vfrPreflightStart;
|
|
|
|
const phase3Start = Date.now();
|
|
const configuredCacheRootDir = config?.extractCacheDir;
|
|
let cacheRootDir: string | undefined;
|
|
if (configuredCacheRootDir) {
|
|
try {
|
|
mkdirSync(configuredCacheRootDir, { recursive: true });
|
|
cacheRootDir = configuredCacheRootDir;
|
|
} catch {
|
|
process.stderr.write(
|
|
`[hyperframes:render] WARNING: extraction cache dir ${configuredCacheRootDir} is not writable; caching disabled for this render\n`,
|
|
);
|
|
}
|
|
}
|
|
|
|
async function tryCachedExtract(
|
|
video: VideoElement,
|
|
videoPath: string,
|
|
videoDuration: number,
|
|
i: number,
|
|
metadata: VideoMetadata,
|
|
cacheFormat: CacheFrameFormat,
|
|
sdrToHdrTransfer?: HdrTransfer,
|
|
): Promise<ExtractedFrames | null> {
|
|
if (!cacheRootDir) return null;
|
|
const keyInput = cacheKeyInputs[i];
|
|
if (!keyInput) return null;
|
|
|
|
const keyDuration = resolveSegmentDuration(
|
|
keyInput.end - keyInput.start,
|
|
keyInput.mediaStart,
|
|
metadata,
|
|
);
|
|
const lookup = lookupCacheEntry(cacheRootDir, {
|
|
videoPath: keyInput.videoPath,
|
|
mtimeMs: keyInput.mtimeMs,
|
|
size: keyInput.size,
|
|
mediaStart: keyInput.mediaStart,
|
|
duration: keyDuration,
|
|
fps: options.fps,
|
|
format: cacheFormat,
|
|
transform: sdrToHdrTransfer ? sdrToHdrTransformKey(sdrToHdrTransfer) : undefined,
|
|
});
|
|
|
|
if (lookup.hit) {
|
|
breakdown.cacheHits += 1;
|
|
touchCacheEntry(lookup.entry);
|
|
const rehydrated = rehydrateCacheEntry(lookup.entry, {
|
|
videoId: video.id,
|
|
srcPath: keyInput.videoPath,
|
|
fps: options.fps,
|
|
format: cacheFormat,
|
|
metadata,
|
|
});
|
|
return { ...rehydrated, ownedByLookup: true };
|
|
}
|
|
|
|
breakdown.cacheMisses += 1;
|
|
const partialDir = partialCacheEntryDir(lookup.entry);
|
|
mkdirSync(partialDir, { recursive: true });
|
|
const result = await extractVideoFramesRange(
|
|
videoPath,
|
|
video.id,
|
|
video.mediaStart,
|
|
videoDuration,
|
|
{ ...options, format: cacheFormat, sdrToHdrTransfer },
|
|
signal,
|
|
config,
|
|
partialDir,
|
|
);
|
|
const published = publishCacheEntry(lookup.entry, partialDir);
|
|
if (!published.published) {
|
|
breakdown.cachePublishFailures += 1;
|
|
return { ...result, ownedByLookup: false };
|
|
}
|
|
|
|
const rehydrated = rehydrateCacheEntry(lookup.entry, {
|
|
videoId: video.id,
|
|
srcPath: keyInput.videoPath,
|
|
fps: options.fps,
|
|
format: cacheFormat,
|
|
metadata,
|
|
});
|
|
return { ...rehydrated, ownedByLookup: true };
|
|
}
|
|
|
|
function extractionError(videoId: string, err: unknown): { videoId: string; error: string } {
|
|
return { videoId, error: err instanceof Error ? err.message : String(err) };
|
|
}
|
|
|
|
type PreparedExtraction = {
|
|
video: VideoElement;
|
|
videoPath: string;
|
|
index: number;
|
|
metadata: VideoMetadata;
|
|
videoDuration: number;
|
|
format: CacheFrameFormat;
|
|
sdrToHdrTransfer?: HdrTransfer;
|
|
dedupeKey: string;
|
|
};
|
|
|
|
type PreparedExtractionResult =
|
|
| { work: PreparedExtraction }
|
|
| { error: { videoId: string; error: string } };
|
|
|
|
const preparedExtractions: PreparedExtractionResult[] = await Promise.all(
|
|
resolvedVideos.map(async ({ video, videoPath }, index) => {
|
|
if (signal?.aborted) {
|
|
throw new Error("Video frame extraction cancelled");
|
|
}
|
|
try {
|
|
const metadata = videoMetadata[index] ?? (await extractMediaMetadata(videoPath));
|
|
const videoDuration = resolveSegmentDuration(
|
|
video.end - video.start,
|
|
video.mediaStart,
|
|
metadata,
|
|
);
|
|
if (video.end - video.start !== videoDuration) {
|
|
video.end = video.start + videoDuration;
|
|
}
|
|
|
|
const format = resolveFrameFormat(metadata, options.format);
|
|
const sdrToHdrTransfer = sdrToHdrTransfers[index];
|
|
const dedupeKey = `${videoPath}\0${video.mediaStart}\0${videoDuration}\0${options.fps}\0${format}\0${sdrToHdrTransfer ?? ""}`;
|
|
|
|
return {
|
|
work: {
|
|
video,
|
|
videoPath,
|
|
index,
|
|
metadata,
|
|
videoDuration,
|
|
format,
|
|
sdrToHdrTransfer,
|
|
dedupeKey,
|
|
},
|
|
};
|
|
} catch (err) {
|
|
return { error: extractionError(video.id, err) };
|
|
}
|
|
}),
|
|
);
|
|
|
|
// Value carries the leader's videoId so a shared-extraction failure can be
|
|
// attributed: N deduped elements otherwise report the same root error under
|
|
// N different videoIds, which reads as N independent failures in traces.
|
|
const inFlightExtractions = new Map<
|
|
string,
|
|
{ leaderVideoId: string; promise: Promise<ExtractedFrames> }
|
|
>();
|
|
const results = await Promise.all(
|
|
preparedExtractions.map(async (prepared) => {
|
|
if ("error" in prepared) return prepared;
|
|
const { work } = prepared;
|
|
|
|
try {
|
|
const existing = inFlightExtractions.get(work.dedupeKey);
|
|
if (existing) {
|
|
try {
|
|
const shared = await existing.promise;
|
|
return { result: { ...shared, videoId: work.video.id } };
|
|
} catch (err) {
|
|
const message = err instanceof Error ? err.message : String(err);
|
|
return {
|
|
error: {
|
|
videoId: work.video.id,
|
|
error: `[shared extraction, leader ${existing.leaderVideoId}] ${message}`,
|
|
},
|
|
};
|
|
}
|
|
}
|
|
|
|
const extraction = (async () => {
|
|
const cached = await tryCachedExtract(
|
|
work.video,
|
|
work.videoPath,
|
|
work.videoDuration,
|
|
work.index,
|
|
work.metadata,
|
|
work.format,
|
|
work.sdrToHdrTransfer,
|
|
);
|
|
if (cached) return cached;
|
|
|
|
return extractVideoFramesRange(
|
|
work.videoPath,
|
|
work.video.id,
|
|
work.video.mediaStart,
|
|
work.videoDuration,
|
|
{ ...options, format: work.format, sdrToHdrTransfer: work.sdrToHdrTransfer },
|
|
signal,
|
|
config,
|
|
);
|
|
})();
|
|
|
|
inFlightExtractions.set(work.dedupeKey, {
|
|
leaderVideoId: work.video.id,
|
|
promise: extraction,
|
|
});
|
|
return { result: await extraction };
|
|
} catch (err) {
|
|
return { error: extractionError(work.video.id, err) };
|
|
}
|
|
}),
|
|
);
|
|
|
|
breakdown.extractMs = Date.now() - phase3Start;
|
|
|
|
// Collect results and errors
|
|
for (const item of results) {
|
|
if ("error" in item && item.error) {
|
|
errors.push(item.error);
|
|
} else if ("result" in item) {
|
|
extracted.push(item.result);
|
|
totalFramesExtracted += item.result.totalFrames;
|
|
}
|
|
}
|
|
|
|
if (cacheRootDir) {
|
|
const gcStats = gcExtractionCache(cacheRootDir, {
|
|
maxBytes: config?.extractCacheMaxBytes ?? DEFAULT_CONFIG.extractCacheMaxBytes,
|
|
minAgeMs: EXTRACT_CACHE_MIN_AGE_MS,
|
|
});
|
|
breakdown.cacheGcEvictions = gcStats.evictedEntries;
|
|
breakdown.cacheGcBytesFreed = gcStats.evictedBytes;
|
|
breakdown.cacheAgedPartialsCleared = gcStats.agedPartialsRemoved;
|
|
}
|
|
|
|
return {
|
|
success: errors.length === 0,
|
|
extracted,
|
|
errors,
|
|
totalFramesExtracted,
|
|
durationMs: Date.now() - startTime,
|
|
phaseBreakdown: breakdown,
|
|
};
|
|
}
|
|
|
|
export function getFrameAtTime(
|
|
extracted: ExtractedFrames,
|
|
globalTime: number,
|
|
videoStart: number,
|
|
loop = false,
|
|
mediaStart = 0,
|
|
): string | null {
|
|
let localTime = globalTime - videoStart;
|
|
if (localTime < 0) return null;
|
|
const loopDuration = Math.max(0, extracted.metadata.durationSeconds - mediaStart);
|
|
if (loop && loopDuration > 0 && localTime >= loopDuration) {
|
|
localTime %= loopDuration;
|
|
}
|
|
// Add epsilon before flooring to avoid IEEE 754 boundary errors where
|
|
// e.g. 0.28 * 25 === 6.999999999999999 instead of 7.
|
|
const frameIndex = Math.floor(localTime * extracted.fps + 1e-9);
|
|
if (loop && frameIndex >= extracted.totalFrames && extracted.totalFrames > 0) {
|
|
return extracted.framePaths.get(extracted.totalFrames - 1) || null;
|
|
}
|
|
if (frameIndex < 0 || frameIndex >= extracted.totalFrames) return null;
|
|
return extracted.framePaths.get(frameIndex) || null;
|
|
}
|
|
|
|
const HOLD_LAST_FRAME_TOLERANCE_FRAMES = 2;
|
|
|
|
/**
|
|
* Whether a clip's source is shorter than its `data-duration` slot by more than
|
|
* the compiler tolerates before clamping the slot to the media
|
|
* (MEDIA_DURATION_CLAMP_EPSILON_SECONDS) — the case worth warning about. Shared
|
|
* by the render and `validate` warnings. `null` when the media covers the slot,
|
|
* the clip loops, or inputs are unusable.
|
|
*/
|
|
export function analyzeClipMediaFit(params: {
|
|
/** Timeline slot length in seconds — `end - start` (a.k.a. data-duration). */
|
|
slotSeconds: number;
|
|
/** Playable source media after the trim offset — `duration - mediaStart`. */
|
|
mediaSeconds: number;
|
|
/** Looping clips repeat to fill the slot, so they never fall short. */
|
|
loop?: boolean;
|
|
}): { shortfallSeconds: number; toleranceSeconds: number } | null {
|
|
const { slotSeconds, mediaSeconds, loop } = params;
|
|
if (loop) return null;
|
|
if (!(slotSeconds > 0) || !Number.isFinite(mediaSeconds) || mediaSeconds < 0) return null;
|
|
const toleranceSeconds = MEDIA_DURATION_CLAMP_EPSILON_SECONDS;
|
|
const shortfallSeconds = slotSeconds - mediaSeconds;
|
|
if (shortfallSeconds <= toleranceSeconds) return null;
|
|
return { shortfallSeconds, toleranceSeconds };
|
|
}
|
|
|
|
export class FrameLookupTable {
|
|
private videos: Map<
|
|
string,
|
|
{
|
|
extracted: ExtractedFrames;
|
|
start: number;
|
|
end: number;
|
|
mediaStart: number;
|
|
loop: boolean;
|
|
}
|
|
> = new Map();
|
|
private orderedVideos: Array<{
|
|
videoId: string;
|
|
extracted: ExtractedFrames;
|
|
start: number;
|
|
end: number;
|
|
mediaStart: number;
|
|
loop: boolean;
|
|
}> = [];
|
|
private activeVideoIds: Set<string> = new Set();
|
|
private startCursor = 0;
|
|
private lastTime: number | null = null;
|
|
|
|
addVideo(
|
|
extracted: ExtractedFrames,
|
|
start: number,
|
|
end: number,
|
|
mediaStart: number,
|
|
loop = false,
|
|
): void {
|
|
this.videos.set(extracted.videoId, { extracted, start, end, mediaStart, loop });
|
|
this.orderedVideos = Array.from(this.videos.entries())
|
|
.map(([videoId, video]) => ({ videoId, ...video }))
|
|
.sort((a, b) => a.start - b.start);
|
|
this.resetActiveState();
|
|
}
|
|
|
|
getFrame(videoId: string, globalTime: number): string | null {
|
|
const video = this.videos.get(videoId);
|
|
if (!video) return null;
|
|
if (globalTime < video.start || globalTime > video.end) return null;
|
|
return getFrameAtTime(video.extracted, globalTime, video.start, video.loop, video.mediaStart);
|
|
}
|
|
|
|
private resetActiveState(): void {
|
|
this.activeVideoIds.clear();
|
|
this.startCursor = 0;
|
|
this.lastTime = null;
|
|
}
|
|
|
|
private refreshActiveSet(globalTime: number): void {
|
|
// The active window is [start, end] INCLUSIVE of the end, mirroring the
|
|
// runtime's element-visibility contract (core/runtime init.ts keeps an
|
|
// element visible through `currentTime <= end`). An exclusive end-bound
|
|
// here deactivated the video one frame early, so the frame landing exactly
|
|
// on a clip's end rendered blank while the runtime still showed it.
|
|
if (this.lastTime == null || globalTime < this.lastTime) {
|
|
this.activeVideoIds.clear();
|
|
this.startCursor = 0;
|
|
for (const entry of this.orderedVideos) {
|
|
if (entry.start <= globalTime && globalTime <= entry.end) {
|
|
this.activeVideoIds.add(entry.videoId);
|
|
}
|
|
if (entry.start <= globalTime) {
|
|
this.startCursor += 1;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
this.lastTime = globalTime;
|
|
return;
|
|
}
|
|
|
|
while (this.startCursor < this.orderedVideos.length) {
|
|
const candidate = this.orderedVideos[this.startCursor];
|
|
if (!candidate) break;
|
|
if (candidate.start > globalTime) {
|
|
break;
|
|
}
|
|
if (globalTime <= candidate.end) {
|
|
this.activeVideoIds.add(candidate.videoId);
|
|
}
|
|
this.startCursor += 1;
|
|
}
|
|
|
|
for (const videoId of Array.from(this.activeVideoIds)) {
|
|
const video = this.videos.get(videoId);
|
|
if (!video || globalTime < video.start || globalTime > video.end) {
|
|
this.activeVideoIds.delete(videoId);
|
|
}
|
|
}
|
|
this.lastTime = globalTime;
|
|
}
|
|
|
|
getActiveFramePayloads(
|
|
globalTime: number,
|
|
): Map<string, { framePath: string; frameIndex: number }> {
|
|
const frames = new Map<string, { framePath: string; frameIndex: number }>();
|
|
this.refreshActiveSet(globalTime);
|
|
for (const videoId of this.activeVideoIds) {
|
|
const video = this.videos.get(videoId);
|
|
if (!video) continue;
|
|
let localTime = globalTime - video.start;
|
|
const loopDuration = Math.max(0, video.extracted.metadata.durationSeconds - video.mediaStart);
|
|
if (video.loop && loopDuration > 0 && localTime >= loopDuration) {
|
|
localTime %= loopDuration;
|
|
}
|
|
const frameIndex = Math.floor(localTime * video.extracted.fps + 1e-9);
|
|
if (video.loop && frameIndex >= video.extracted.totalFrames) {
|
|
const framePath = video.extracted.framePaths.get(video.extracted.totalFrames - 1);
|
|
if (framePath) {
|
|
frames.set(videoId, { framePath, frameIndex: video.extracted.totalFrames - 1 });
|
|
}
|
|
continue;
|
|
}
|
|
if (frameIndex < 0 || frameIndex >= video.extracted.totalFrames) {
|
|
// Source exhausted. Hold the last frame near the clip end so a media that
|
|
// falls a hair short of its slot (e.g. `ffmpeg -t 1.45` → 1.433s at 30fps)
|
|
// doesn't flash the background for one frame. A clip that's substantially
|
|
// shorter than its slot still blanks for the tail. Tolerance floored at
|
|
// the clamp epsilon so the seam is covered at any fps (see that const).
|
|
const fps = video.extracted.fps;
|
|
const holdTolerance = Math.max(
|
|
fps > 0 ? HOLD_LAST_FRAME_TOLERANCE_FRAMES / fps : 0,
|
|
MEDIA_DURATION_CLAMP_EPSILON_SECONDS,
|
|
);
|
|
if (globalTime >= video.end - holdTolerance && video.extracted.totalFrames > 0) {
|
|
const lastIndex = video.extracted.totalFrames - 1;
|
|
const lastPath = video.extracted.framePaths.get(lastIndex);
|
|
if (lastPath) frames.set(videoId, { framePath: lastPath, frameIndex: lastIndex });
|
|
}
|
|
continue;
|
|
}
|
|
const framePath = video.extracted.framePaths.get(frameIndex);
|
|
if (!framePath) continue;
|
|
frames.set(videoId, { framePath, frameIndex });
|
|
}
|
|
return frames;
|
|
}
|
|
|
|
getActiveFrames(globalTime: number): Map<string, string> {
|
|
const payloads = this.getActiveFramePayloads(globalTime);
|
|
const frames = new Map<string, string>();
|
|
for (const [videoId, payload] of payloads) {
|
|
frames.set(videoId, payload.framePath);
|
|
}
|
|
return frames;
|
|
}
|
|
|
|
cleanup(): void {
|
|
for (const video of this.videos.values()) {
|
|
// Cache-hit / cache-write entries are owned by the extraction cache —
|
|
// a single render must not delete them, or the next render's lookup
|
|
// would miss and re-extract unnecessarily.
|
|
if (video.extracted.ownedByLookup) continue;
|
|
if (existsSync(video.extracted.outputDir)) {
|
|
rmSync(video.extracted.outputDir, { recursive: true, force: true });
|
|
}
|
|
}
|
|
this.videos.clear();
|
|
this.orderedVideos = [];
|
|
this.resetActiveState();
|
|
}
|
|
}
|
|
|
|
export function createFrameLookupTable(
|
|
videos: VideoElement[],
|
|
extracted: ExtractedFrames[],
|
|
): FrameLookupTable {
|
|
const table = new FrameLookupTable();
|
|
const extractedMap = new Map<string, ExtractedFrames>();
|
|
for (const ext of extracted) extractedMap.set(ext.videoId, ext);
|
|
|
|
for (const video of videos) {
|
|
const ext = extractedMap.get(video.id);
|
|
if (ext) table.addVideo(ext, video.start, video.end, video.mediaStart, video.loop);
|
|
}
|
|
|
|
return table;
|
|
}
|