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fix(studio): preserve alpha proxy playback (#2625)

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* fix(studio): preserve alpha proxy playback

* test(cli): pin VP8 alpha proxy pre-resolution

* fix(studio): emit textarea field-sizing CSS

* test(studio): verify textarea CSS generation
This commit is contained in:
Miguel Ángel
2026-07-17 21:56:27 -04:00
committed by GitHub
parent bcdb90a45f
commit e64a22893a
15 changed files with 125 additions and 88 deletions
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packages/studio-server/src/helpers/proxyTranscoder.ts
+8 -10
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@@ -32,7 +32,7 @@ import { PROXY_VARIANT_CONFIG, type ProxyVariant } from "./mediaCodecMap.js";
* entry still lands for the next request.
*/
export const PROXY_PARAMS_VERSION = "v3";
export const PROXY_PARAMS_VERSION = "v4";
const CACHE_DIR_NAME = ".transcode-cache";
@@ -314,13 +314,13 @@ async function runFfmpeg(
if (!ffmpegPath) {
throw new FfmpegUnavailableError();
}
// The HDR tonemap filters discard alpha. VP9 is the alpha-preserving proxy
// The HDR tonemap filters discard alpha. VP8 is the alpha-preserving proxy
// variant, so retain its source color values instead of making it opaque.
if (metadata.color.isHdr && variant !== "vp9") await ensureHdrFilters(ffmpegPath);
if (metadata.color.isHdr && variant !== "vp8") await ensureHdrFilters(ffmpegPath);
const evenScale = "scale=trunc(iw/2)*2:trunc(ih/2)*2";
const pixelFormat = variant === "vp9" ? "yuva420p" : "yuv420p";
const pixelFormat = variant === "vp8" ? "yuva420p" : "yuv420p";
const videoFilter =
metadata.color.isHdr && variant !== "vp9"
metadata.color.isHdr && variant !== "vp8"
? [
"zscale=t=linear:npl=100",
"tonemap=hable:desat=0",
@@ -354,9 +354,9 @@ async function runFfmpeg(
"-movflags",
"+faststart",
];
const vp9Args = [
const vp8Args = [
"-c:v",
"libvpx-vp9",
"libvpx",
"-b:v",
"0",
"-crf",
@@ -371,8 +371,6 @@ async function runFfmpeg(
"bt709",
"-color_trc",
"bt709",
"-row-mt",
"1",
"-cpu-used",
"4",
"-auto-alt-ref",
@@ -384,7 +382,7 @@ async function runFfmpeg(
"-c:a",
"libopus",
];
const args = [...commonArgs, ...(variant === "vp9" ? vp9Args : h264Args), outputPath];
const args = [...commonArgs, ...(variant === "vp8" ? vp8Args : h264Args), outputPath];
// Hard ceiling so a hung ffmpeg can never permanently occupy one of the
// global transcode slots: the child is killed and the slot released via