From 664c39db9e604a504bd1336c7b2ba3368cf1379d Mon Sep 17 00:00:00 2001
From: Miguel Angel Simon Sierra <miguel.sierra@heygen.com>
Date: Tue, 14 Jul 2026 19:26:50 -0400
Subject: [PATCH] feat(lint): flag HEVC video assets with info-level preview
 note

---
 packages/lint/src/assetResolution.ts |  75 ++++++++++
 packages/lint/src/hevcPreviewLint.ts | 202 +++++++++++++++++++++++++++
 packages/lint/src/project.test.ts    | 169 +++++++++++++++++++++-
 packages/lint/src/project.ts         |  75 ++--------
 4 files changed, 456 insertions(+), 65 deletions(-)
 create mode 100644 packages/lint/src/assetResolution.ts
 create mode 100644 packages/lint/src/hevcPreviewLint.ts

diff --git a/packages/lint/src/assetResolution.ts b/packages/lint/src/assetResolution.ts
new file mode 100644
index 000000000..4ff76a141
--- /dev/null
+++ b/packages/lint/src/assetResolution.ts
@@ -0,0 +1,75 @@
+import { existsSync } from "node:fs";
+import { isAbsolute, posix, relative, resolve } from "node:path";
+import { decodeUrlPathVariants } from "@hyperframes/parsers/composition";
+
+/**
+ * Shared local-asset resolution helpers used by both the project-level lint
+ * rules (`project.ts`) and the HEVC preview-codec check
+ * (`hevcPreviewLint.ts`). Split out so the latter doesn't need to import from
+ * `project.ts` (which imports it back to run the rule) — that would be a
+ * circular import within the package.
+ */
+
+export function isRemoteOrInlineUrl(url: string): boolean {
+  return /^(https?:|data:|blob:|\/\/|#)/i.test(url);
+}
+
+export function cleanAssetUrl(url: string): string {
+  return url.trim().split(/[?#]/, 1)[0] ?? "";
+}
+
+export function isWithinProjectRoot(projectDir: string, candidate: string): boolean {
+  const projectRoot = resolve(projectDir);
+  const relativePath = relative(projectRoot, candidate);
+  return relativePath === "" || (!relativePath.startsWith("..") && !isAbsolute(relativePath));
+}
+
+function addCandidate(candidates: string[], candidate: string): void {
+  if (!candidates.includes(candidate)) candidates.push(candidate);
+}
+
+export function resolveLocalAssetCandidates(projectDir: string, url: string): string[] {
+  const cleanUrl = cleanAssetUrl(url);
+  const projectRoot = resolve(projectDir);
+  const candidates: string[] = [];
+
+  for (const variant of decodeUrlPathVariants(cleanUrl)) {
+    const projectRelative = variant.startsWith("/") ? variant.slice(1) : variant;
+    const resolved = resolve(projectRoot, projectRelative);
+    if (isWithinProjectRoot(projectRoot, resolved)) {
+      addCandidate(candidates, resolved);
+      continue;
+    }
+
+    const normalized = posix.normalize(projectRelative.replace(/\\/g, "/"));
+    const clamped = normalized.replace(/^(\.\.\/)+/, "");
+    if (clamped && !clamped.startsWith("..")) {
+      addCandidate(candidates, resolve(projectRoot, clamped));
+    }
+  }
+
+  return candidates;
+}
+
+export function resolveExistingLocalAsset(
+  projectDir: string,
+  url: string,
+): { resolved: string; rootRelativePath: string } | null {
+  const projectRoot = resolve(projectDir);
+  const resolved = resolveLocalAssetCandidates(projectRoot, url).find(existsSync);
+  if (!resolved) return null;
+  return { resolved, rootRelativePath: relative(projectRoot, resolved) };
+}
+
+function maskRange(src: string, pattern: RegExp): string {
+  return src.replace(pattern, (m) => " ".repeat(m.length));
+}
+
+/** Blanks out comments, `<style>`, and `<script>` bodies so tag-scanning
+ * regexes don't false-positive on commented-out or scripted markup. */
+export function maskNonScannableRanges(html: string): string {
+  let out = maskRange(html, /<!--[\s\S]*?-->/g);
+  out = maskRange(out, /<style\b[^>]*>[\s\S]*?<\/style\b[^>]*>/gi);
+  out = maskRange(out, /<script\b[^>]*>[\s\S]*?<\/script\b[^>]*>/gi);
+  return out;
+}
diff --git a/packages/lint/src/hevcPreviewLint.ts b/packages/lint/src/hevcPreviewLint.ts
new file mode 100644
index 000000000..d8759101d
--- /dev/null
+++ b/packages/lint/src/hevcPreviewLint.ts
@@ -0,0 +1,202 @@
+// fallow-ignore-file code-duplication
+import { execFile, execSync } from "node:child_process";
+import { existsSync } from "node:fs";
+import { resolve } from "node:path";
+import { rewriteAssetPath } from "@hyperframes/parsers/asset-paths";
+import {
+  cleanAssetUrl,
+  isRemoteOrInlineUrl,
+  maskNonScannableRanges,
+  resolveExistingLocalAsset,
+} from "./assetResolution.js";
+import type { HyperframeLintFinding } from "./types.js";
+
+/** Structurally compatible with `project.ts`'s (unexported) `HtmlSource` —
+ * duplicated as a shape, not imported, to avoid a circular import between
+ * this file and `project.ts` (which imports `lintHevcPreviewCodec` below). */
+interface HtmlSourceLike {
+  html: string;
+  compSrcPath?: string;
+}
+
+const FFPROBE_PATH_ENV = "HYPERFRAMES_FFPROBE_PATH";
+const PROBE_TIMEOUT_MS = 4000;
+
+// Minimal PATH/env-based ffprobe resolution, duplicated from
+// packages/cli/src/browser/ffmpeg.ts (findFFprobe). packages/lint must not
+// depend on packages/cli (the CLI depends on @hyperframes/lint, which would
+// create an import cycle) or packages/engine (too heavy for a lint check),
+// so only the ffprobe-lookup half is re-implemented here — no ffmpeg lookup,
+// no install-hint text, no Linux-distro detection.
+
+function chooseBestFfprobeCandidate(candidates: string[]): string | undefined {
+  const normalized = candidates.map((s) => s.trim()).filter(Boolean);
+  if (normalized.length === 0) return undefined;
+  const preferredExe = normalized.find((c) => c.toLowerCase().endsWith("ffprobe.exe"));
+  if (preferredExe) return preferredExe;
+  const exact = normalized.find((c) => c.toLowerCase().endsWith("ffprobe"));
+  if (exact) return exact;
+  const nonShellShim = normalized.find((c) => {
+    const lower = c.toLowerCase();
+    return !lower.endsWith(".cmd") && !lower.endsWith(".bat");
+  });
+  return nonShellShim ?? normalized[0];
+}
+
+function findFFprobeOnPath(): string | undefined {
+  try {
+    const cmd = process.platform === "win32" ? "where ffprobe" : "which ffprobe";
+    const output = execSync(cmd, {
+      encoding: "utf-8",
+      stdio: ["pipe", "pipe", "pipe"],
+      timeout: 5000,
+    });
+    const candidate = chooseBestFfprobeCandidate(output.split(/\r?\n/));
+    return candidate ? resolve(candidate) : undefined;
+  } catch {
+    return undefined;
+  }
+}
+
+const COMMON_BIN_DIRS =
+  process.platform === "win32"
+    ? []
+    : ["/opt/homebrew/bin", "/usr/local/bin", "/usr/bin", "/bin", "/snap/bin"];
+
+function findFFprobeInCommonDirs(): string | undefined {
+  for (const dir of COMMON_BIN_DIRS) {
+    const candidate = `${dir}/ffprobe`;
+    if (existsSync(candidate)) return candidate;
+  }
+  return undefined;
+}
+
+function findFFprobe(): string | undefined {
+  const configured = process.env[FFPROBE_PATH_ENV]?.trim();
+  if (configured) return existsSync(configured) ? resolve(configured) : undefined;
+  return findFFprobeOnPath() ?? findFFprobeInCommonDirs();
+}
+
+function execFileAsync(file: string, args: string[]): Promise<string> {
+  return new Promise((resolvePromise, reject) => {
+    execFile(file, args, { timeout: PROBE_TIMEOUT_MS }, (error, stdout) => {
+      if (error) reject(error);
+      else resolvePromise(stdout.toString());
+    });
+  });
+}
+
+function hasHevcStream(json: unknown): boolean {
+  if (typeof json !== "object" || json === null) return false;
+  const streams = Reflect.get(json, "streams");
+  if (!Array.isArray(streams)) return false;
+  return streams.some((stream) => {
+    if (typeof stream !== "object" || stream === null) return false;
+    return Reflect.get(stream, "codec_name") === "hevc";
+  });
+}
+
+// Best-effort: any failure (ffprobe missing, times out, non-video file,
+// unparsable output) resolves to "not HEVC" rather than throwing. This rule
+// must never fail lint/check just because ffprobe isn't installed.
+async function probeIsHevc(ffprobePath: string, filePath: string): Promise<boolean> {
+  try {
+    const stdout = await execFileAsync(ffprobePath, [
+      "-v",
+      "error",
+      "-select_streams",
+      "v:0",
+      "-show_entries",
+      "stream=codec_name",
+      "-of",
+      "json",
+      filePath,
+    ]);
+    return hasHevcStream(JSON.parse(stdout));
+  } catch {
+    return false;
+  }
+}
+
+/**
+ * Collects local `<video src>` references, resolved to their absolute path
+ * and deduped by that path — this is both the candidate set AND the in-run
+ * probe cache for `lintHevcPreviewCodec` below: the same file referenced
+ * twice only ends up as one map entry, so it's only probed once.
+ *
+ * Files that don't resolve to an existing local asset are skipped here —
+ * `missing_local_asset` already reports those, and hevc_preview_codec never
+ * probes a file that doesn't exist.
+ */
+// fallow-ignore-next-line complexity
+export function collectLocalVideoCandidates(
+  projectDir: string,
+  htmlSources: HtmlSourceLike[],
+): Map<string, string> {
+  const candidates = new Map<string, string>();
+  const videoSrcRe = /<video\b[^>]*\bsrc\s*=\s*["']([^"']+)["'][^>]*>/gi;
+
+  for (const { html, compSrcPath } of htmlSources) {
+    const scannable = maskNonScannableRanges(html);
+    const re = new RegExp(videoSrcRe.source, videoSrcRe.flags);
+    let match: RegExpExecArray | null;
+    while ((match = re.exec(scannable)) !== null) {
+      const src = cleanAssetUrl(match[1] ?? "");
+      if (!src) continue;
+      if (isRemoteOrInlineUrl(src)) continue;
+      if (/^__[A-Z_]+__$/.test(src)) continue;
+      const rootRelative = compSrcPath ? rewriteAssetPath(compSrcPath, src) : src;
+      const resolvedAsset = resolveExistingLocalAsset(projectDir, rootRelative);
+      if (!resolvedAsset) continue;
+      if (!candidates.has(resolvedAsset.resolved)) candidates.set(resolvedAsset.resolved, src);
+    }
+  }
+
+  return candidates;
+}
+
+/**
+ * INFO-only finding: a locally referenced `<video>` file is encoded as
+ * HEVC/H.265. The render pipeline pre-decodes video with FFmpeg (never the
+ * browser decoder) so rendering is unaffected, but live preview and the
+ * embeddable player play the file directly in-browser, where HEVC support
+ * varies. Never escalated beyond "info" — this must not fail lint or check.
+ *
+ * `candidates` maps each unique resolved file path to a display src string
+ * (already deduped by the caller, so each file is probed exactly once here);
+ * files missing from disk are the caller's responsibility to have excluded —
+ * `missing_local_asset` covers those and this rule never probes them.
+ */
+export async function lintHevcPreviewCodec(
+  candidates: Map<string, string>,
+): Promise<HyperframeLintFinding[]> {
+  if (candidates.size === 0) return [];
+
+  const ffprobePath = findFFprobe();
+  if (!ffprobePath) return [];
+
+  const entries = [...candidates.entries()];
+  const isHevc = await Promise.all(
+    entries.map(([resolvedPath]) => probeIsHevc(ffprobePath, resolvedPath)),
+  );
+
+  const hevcSrcs = entries.filter((_, i) => isHevc[i]).map(([, src]) => src);
+  if (hevcSrcs.length === 0) return [];
+
+  const unique = [...new Set(hevcSrcs)];
+  return [
+    {
+      code: "hevc_preview_codec",
+      severity: "info",
+      message:
+        `Video file(s) use the HEVC/H.265 codec: ${unique.join(", ")}. ` +
+        "The render pipeline pre-decodes video with FFmpeg and never uses the browser's video decoder, so these render correctly. " +
+        "Live preview/player playback requires a browser with HEVC support. " +
+        "If preview playback fails, generate an H.264 proxy (e.g. via the media-use skill) and reference that instead.",
+      fixHint:
+        unique.length === 1
+          ? `Generate an H.264 proxy for "${unique[0]}" (e.g. via the media-use skill) if it fails to play in preview.`
+          : "Generate H.264 proxies for these files (e.g. via the media-use skill) if they fail to play in preview.",
+    },
+  ];
+}
diff --git a/packages/lint/src/project.test.ts b/packages/lint/src/project.test.ts
index a2705d4ce..ca20318f1 100644
--- a/packages/lint/src/project.test.ts
+++ b/packages/lint/src/project.test.ts
@@ -1,10 +1,17 @@
-import { describe, it, expect, afterEach } from "vitest";
+import { describe, it, expect, afterEach, beforeEach, vi } from "vitest";
+import { ChildProcess, execFile } from "node:child_process";
 import { mkdirSync, mkdtempSync, writeFileSync, rmSync } from "node:fs";
 import { join } from "node:path";
 import { tmpdir } from "node:os";
 import type { HyperframeLintFinding } from "./types.js";
 import { lintProject } from "./project.js";
 
+// Keep project lint tests independent of the host's ffprobe installation.
+vi.mock("node:child_process", () => {
+  const mocked = { ChildProcess: class {}, execFile: vi.fn(), execSync: vi.fn() };
+  return { ...mocked, default: mocked };
+});
+
 function tmpProject(name: string): string {
   return mkdtempSync(join(tmpdir(), `hf-lint-test-${name}-`));
 }
@@ -235,3 +242,163 @@ describe("template shell style sources", () => {
     expect(findings.some((finding) => finding.code === "texture_mask_asset_not_found")).toBe(true);
   });
 });
+
+describe("hevc_preview_codec", () => {
+  interface ProbeStream {
+    codec_name: string;
+    codec_tag_string: string;
+  }
+
+  const mockExecFile = vi.mocked(execFile);
+
+  // Any real file works as a stand-in "ffprobe" path — execFile itself is
+  // mocked below, so it's never actually spawned.
+  const FAKE_FFPROBE_PATH = process.execPath;
+
+  function mockFfprobeStreams(streamsByFile: Record<string, ProbeStream[]>): void {
+    mockExecFile.mockImplementation((_file, args, _options, callback) => {
+      const filePath = args[args.length - 1] ?? "";
+      callback(
+        null,
+        Buffer.from(JSON.stringify({ streams: streamsByFile[filePath] ?? [] })),
+        Buffer.alloc(0),
+      );
+      return new ChildProcess();
+    });
+  }
+
+  function videoHtml(...videoSrcs: string[]): string {
+    const videoTags = videoSrcs
+      .map(
+        (src, i) =>
+          `<video id="v${i}" class="clip" src="${src}" muted data-start="${i * 5}" data-duration="5"></video>`,
+      )
+      .join("\n    ");
+    return `<html><body>
+  <div data-composition-id="main" data-width="1920" data-height="1080" data-start="0" data-duration="10">
+    ${videoTags}
+  </div>
+  <script src="https://cdn.jsdelivr.net/npm/gsap@3/dist/gsap.min.js"></script>
+  <script>window.__timelines = window.__timelines || {}; window.__timelines["main"] = gsap.timeline({ paused: true });</script>
+</body></html>`;
+  }
+
+  function makeVideoProject(
+    videoSrc: string,
+    writeVideoFile = true,
+  ): { project: string; videoAbsPath: string } {
+    const project = makeProject(videoHtml(videoSrc));
+    const videoAbsPath = join(project, videoSrc);
+    if (writeVideoFile) writeFileSync(videoAbsPath, "fake video bytes");
+    return { project, videoAbsPath };
+  }
+
+  async function hevcFindings(project: string): Promise<HyperframeLintFinding[]> {
+    const { results } = await lintProject(project);
+    return results.flatMap((r) => r.result.findings).filter((f) => f.code === "hevc_preview_codec");
+  }
+
+  beforeEach(() => {
+    process.env.HYPERFRAMES_FFPROBE_PATH = FAKE_FFPROBE_PATH;
+    mockExecFile.mockReset();
+  });
+
+  afterEach(() => {
+    delete process.env.HYPERFRAMES_FFPROBE_PATH;
+    mockExecFile.mockReset();
+  });
+
+  it("flags an HEVC video with exactly one info finding naming the file", async () => {
+    const { project, videoAbsPath } = makeVideoProject("clip.mp4");
+    mockFfprobeStreams({
+      [videoAbsPath]: [{ codec_name: "hevc", codec_tag_string: "hvc1" }],
+    });
+
+    const result = await lintProject(project);
+    const findings = result.results
+      .flatMap((entry) => entry.result.findings)
+      .filter((finding) => finding.code === "hevc_preview_codec");
+
+    expect(findings).toHaveLength(1);
+    expect(findings[0]?.severity).toBe("info");
+    expect(findings[0]?.code).toBe("hevc_preview_codec");
+    expect(findings[0]?.message).toContain("clip.mp4");
+    expect(findings[0]?.message).toContain("requires a browser with HEVC support");
+    expect(result.totalErrors).toBe(0);
+    expect(result.results[0]?.result.ok).toBe(true);
+  });
+
+  it('flags an hev1-tagged HEVC video the same way (ffprobe reports codec_name "hevc" regardless of the container fourcc)', async () => {
+    const { project, videoAbsPath } = makeVideoProject("clip-hev1.mp4");
+    mockFfprobeStreams({
+      [videoAbsPath]: [{ codec_name: "hevc", codec_tag_string: "hev1" }],
+    });
+
+    const findings = await hevcFindings(project);
+
+    expect(findings).toHaveLength(1);
+    expect(findings[0]?.message).toContain("clip-hev1.mp4");
+  });
+
+  it("does not flag an H.264 video", async () => {
+    const { project, videoAbsPath } = makeVideoProject("clip.mp4");
+    mockFfprobeStreams({
+      [videoAbsPath]: [{ codec_name: "h264", codec_tag_string: "avc1" }],
+    });
+
+    const findings = await hevcFindings(project);
+
+    expect(findings).toHaveLength(0);
+  });
+
+  it("does not flag anything, and lint completes normally, when ffprobe cannot be resolved", async () => {
+    const { project } = makeVideoProject("clip.mp4");
+    process.env.HYPERFRAMES_FFPROBE_PATH = join(project, "missing-ffprobe");
+
+    const { results, totalErrors } = await lintProject(project);
+
+    const findings = results.flatMap((r) => r.result.findings);
+    expect(findings.some((f) => f.code === "hevc_preview_codec")).toBe(false);
+    expect(mockExecFile).not.toHaveBeenCalled();
+    expect(totalErrors).toBe(0);
+  });
+
+  it("silently skips the finding when ffprobe errors or times out", async () => {
+    const { project } = makeVideoProject("clip.mp4");
+    mockExecFile.mockImplementation((_file, _args, _options, callback) => {
+      callback(new Error("ffprobe timed out"), Buffer.alloc(0), Buffer.alloc(0));
+      return new ChildProcess();
+    });
+
+    const { results, totalErrors } = await lintProject(project);
+
+    const findings = results.flatMap((entry) => entry.result.findings);
+    expect(findings.some((finding) => finding.code === "hevc_preview_codec")).toBe(false);
+    expect(totalErrors).toBe(0);
+  });
+
+  it("does not probe or flag a missing video file — missing_local_asset covers it instead", async () => {
+    const { project } = makeVideoProject("missing.mp4", false);
+
+    const { results } = await lintProject(project);
+
+    const findings = results.flatMap((r) => r.result.findings);
+    expect(findings.some((f) => f.code === "hevc_preview_codec")).toBe(false);
+    expect(findings.some((f) => f.code === "missing_local_asset")).toBe(true);
+    expect(mockExecFile).not.toHaveBeenCalled();
+  });
+
+  it("probes the same HEVC file once when referenced twice (per-run cache)", async () => {
+    const project = makeProject(videoHtml("clip.mp4", "clip.mp4"));
+    const videoAbsPath = join(project, "clip.mp4");
+    writeFileSync(videoAbsPath, "fake video bytes");
+    mockFfprobeStreams({
+      [videoAbsPath]: [{ codec_name: "hevc", codec_tag_string: "hvc1" }],
+    });
+
+    const findings = await hevcFindings(project);
+
+    expect(findings).toHaveLength(1);
+    expect(mockExecFile).toHaveBeenCalledTimes(1);
+  });
+});
diff --git a/packages/lint/src/project.ts b/packages/lint/src/project.ts
index 809796228..12d27de92 100644
--- a/packages/lint/src/project.ts
+++ b/packages/lint/src/project.ts
@@ -1,10 +1,18 @@
 export { shouldBlockRender } from "./shouldBlockRender.js";
 import { existsSync, readFileSync, readdirSync } from "node:fs";
-import { dirname, extname, isAbsolute, join, posix, relative, resolve } from "node:path";
-import { decodeUrlPathVariants } from "@hyperframes/parsers/composition";
+import { dirname, extname, join, relative, resolve } from "node:path";
 import { rewriteAssetPath } from "@hyperframes/parsers/asset-paths";
 import { checkSubCompositionUsability } from "@hyperframes/parsers/sub-composition-validity";
 import { parseHTML } from "linkedom";
+import {
+  cleanAssetUrl,
+  isRemoteOrInlineUrl,
+  isWithinProjectRoot,
+  maskNonScannableRanges,
+  resolveExistingLocalAsset,
+  resolveLocalAssetCandidates,
+} from "./assetResolution.js";
+import { collectLocalVideoCandidates, lintHevcPreviewCodec } from "./hevcPreviewLint.js";
 import { lintHyperframeHtml } from "./hyperframeLinter.js";
 import type { HyperframeLintFinding, HyperframeLintResult } from "./types.js";
 import type { ParsableDocumentLike } from "@hyperframes/parsers/sub-composition-validity";
@@ -113,57 +121,6 @@ function collectCssSources(projectDir: string, html: string, compSrcPath?: strin
   return sources;
 }
 
-function isRemoteOrInlineUrl(url: string): boolean {
-  return /^(https?:|data:|blob:|\/\/|#)/i.test(url);
-}
-
-function cleanAssetUrl(url: string): string {
-  return url.trim().split(/[?#]/, 1)[0] ?? "";
-}
-
-function isWithinProjectRoot(projectDir: string, candidate: string): boolean {
-  const projectRoot = resolve(projectDir);
-  const relativePath = relative(projectRoot, candidate);
-  return relativePath === "" || (!relativePath.startsWith("..") && !isAbsolute(relativePath));
-}
-
-function addCandidate(candidates: string[], candidate: string): void {
-  if (!candidates.includes(candidate)) candidates.push(candidate);
-}
-
-function resolveLocalAssetCandidates(projectDir: string, url: string): string[] {
-  const cleanUrl = cleanAssetUrl(url);
-  const projectRoot = resolve(projectDir);
-  const candidates: string[] = [];
-
-  for (const variant of decodeUrlPathVariants(cleanUrl)) {
-    const projectRelative = variant.startsWith("/") ? variant.slice(1) : variant;
-    const resolved = resolve(projectRoot, projectRelative);
-    if (isWithinProjectRoot(projectRoot, resolved)) {
-      addCandidate(candidates, resolved);
-      continue;
-    }
-
-    const normalized = posix.normalize(projectRelative.replace(/\\/g, "/"));
-    const clamped = normalized.replace(/^(\.\.\/)+/, "");
-    if (clamped && !clamped.startsWith("..")) {
-      addCandidate(candidates, resolve(projectRoot, clamped));
-    }
-  }
-
-  return candidates;
-}
-
-function resolveExistingLocalAsset(
-  projectDir: string,
-  url: string,
-): { resolved: string; rootRelativePath: string } | null {
-  const projectRoot = resolve(projectDir);
-  const resolved = resolveLocalAssetCandidates(projectRoot, url).find(existsSync);
-  if (!resolved) return null;
-  return { resolved, rootRelativePath: relative(projectRoot, resolved) };
-}
-
 function resolveCssAssetCandidates(
   projectDir: string,
   url: string,
@@ -255,6 +212,7 @@ export async function lintProject(
     ...(!entryFile ? lintMultipleRootCompositions(projectDir) : []),
     ...lintDuplicateAudioTracks(allHtmlSources),
     ...lintMissingOrEmptySubComposition(projectDir, rootHtml),
+    ...(await lintHevcPreviewCodec(collectLocalVideoCandidates(projectDir, allHtmlSources))),
   ];
   if (projectFindings.length > 0) {
     for (const finding of projectFindings) {
@@ -348,17 +306,6 @@ function lintAudioSrcNotFound(
   return findings;
 }
 
-function maskRange(src: string, pattern: RegExp): string {
-  return src.replace(pattern, (m) => " ".repeat(m.length));
-}
-
-function maskNonScannableRanges(html: string): string {
-  let out = maskRange(html, /<!--[\s\S]*?-->/g);
-  out = maskRange(out, /<style\b[^>]*>[\s\S]*?<\/style\b[^>]*>/gi);
-  out = maskRange(out, /<script\b[^>]*>[\s\S]*?<\/script\b[^>]*>/gi);
-  return out;
-}
-
 // fallow-ignore-next-line complexity
 function lintMissingLocalAsset(
   projectDir: string,