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fix(web-test): correct video color range for H.264 players

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JPEG full range (0-255) was tagged as pc/full in H.264 output, but most
players (VLC, etc.) expect limited range (16-235). Convert JPEG→limited
with scale filter and tag as tv. Also switch preset ultrafast→fast for
5-6x smaller files on static screen content.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Nick Shirokov
2026-03-02 20:05:32 +03:00
parent 98c416b5a7
commit 26ea09e2ff
1 changed files with 4 additions and 2 deletions
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.claude/skills/web-test/scripts/browser.mjs
+4 -2
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@@ -2455,9 +2455,11 @@ export async function startRecording(outputPath, opts = {}) {
'-framerate', String(fps), // input framerate '-framerate', String(fps), // input framerate
'-i', '-', // read from stdin '-i', '-', // read from stdin
'-c:v', 'libx264', // H.264 codec '-c:v', 'libx264', // H.264 codec
'-preset', 'ultrafast', // fast encoding '-preset', 'fast', // good quality/speed balance
'-crf', '23', // default quality (good for screen content)
'-vf', 'scale=in_range=full:out_range=limited', // JPEG full→H.264 limited range
'-pix_fmt', 'yuv420p', // broad compatibility '-pix_fmt', 'yuv420p', // broad compatibility
'-color_range', 'pc', // full range (0-255) — match JPEG input '-color_range', 'tv', // limited range (16-235) — standard for H.264 players
'-movflags', '+faststart', // web-friendly MP4 '-movflags', '+faststart', // web-friendly MP4
resolvedPath resolvedPath
], { stdio: ['pipe', 'ignore', 'pipe'] }); ], { stdio: ['pipe', 'ignore', 'pipe'] });