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feat(video): Tune per-codec encoder defaults for quality #5

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David merged 1 commit from feat/video-quality-defaults into main 2026-04-17 21:03:26 +02:00
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David commented 2026-04-17 21:03:22 +02:00
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Adds a CodecSpec table that injects codec-appropriate flags after
-c:v, plus a per-format audio bitrate. The critical fix is for VP9:
without -b:v 0 -crf N, libvpx-vp9 silently falls back to an ~256 kbps
ABR default that produced poor-quality WebM output. VP8, AV1, x264, and
x265 also get sensible CRF/threading defaults so every allowlisted
codec encodes at a reasonable quality-vs-speed trade-off.

A lockstep test asserts every codec in a format's allowlist has a
matching CodecSpec entry, so future codec additions can't regress to
un-tuned output.

Co-Authored-By: Claude Opus 4.7 (1M context) noreply@anthropic.com

Adds a CodecSpec table that injects codec-appropriate flags after `-c:v`, plus a per-format audio bitrate. The critical fix is for VP9: without `-b:v 0 -crf N`, libvpx-vp9 silently falls back to an ~256 kbps ABR default that produced poor-quality WebM output. VP8, AV1, x264, and x265 also get sensible CRF/threading defaults so every allowlisted codec encodes at a reasonable quality-vs-speed trade-off. A lockstep test asserts every codec in a format's allowlist has a matching CodecSpec entry, so future codec additions can't regress to un-tuned output. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
feat(video): Tune per-codec encoder defaults for quality
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1c269b2e42 
Adds a CodecSpec table that injects codec-appropriate flags after
`-c:v`, plus a per-format audio bitrate. The critical fix is for VP9:
without `-b:v 0 -crf N`, libvpx-vp9 silently falls back to an ~256 kbps
ABR default that produced poor-quality WebM output. VP8, AV1, x264, and
x265 also get sensible CRF/threading defaults so every allowlisted
codec encodes at a reasonable quality-vs-speed trade-off.

A lockstep test asserts every codec in a format's allowlist has a
matching CodecSpec entry, so future codec additions can't regress to
un-tuned output.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
David merged commit aa062bb702 into main 2026-04-17 21:03:26 +02:00
David deleted branch feat/video-quality-defaults 2026-04-17 21:03:26 +02:00
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