feat: publish av-tools 0.1.0
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# Generated test fixtures
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The binary fixtures in `generated/` contain synthetic test patterns, solid
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colours, sine waves, short subtitle strings and deliberately malformed bytes.
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They contain no downloaded or recorded media. Native FFmpeg is a
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development/test-generation tool only; the browser application never invokes
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it.
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Regenerate the exact fixture set with:
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```sh
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npm run fixtures:generate
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# or, to replace the known generated set:
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scripts/generate-fixtures.sh --force
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```
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The generator records the native FFmpeg first-version line when it runs.
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The checked-in bytes were generated on 2026-07-24 with FFmpeg 7.1.3 on
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Freedesktop SDK 25.08. Output may differ with another FFmpeg build; review and
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update this inventory and `generated/SHA256SUMS` when intentionally
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regenerating. Regeneration requires native H.264/x264, VP8/libvpx,
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Vorbis/libvorbis, MP3/LAME, AAC, FLAC and PNG encoders. The fixture data is
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dedicated to the public domain under
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CC0-1.0; this statement applies only to `tests/fixtures/generated/`, not to the
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application, which is licensed separately under GPL-3.0-or-later.
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## Inventory
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The exact native argument vectors are in
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[`scripts/generate-fixtures.sh`](../../scripts/generate-fixtures.sh). “Generated
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by” below identifies the relevant source and encoding operation. Every fixture
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is intentionally tiny and exists to exercise a bounded behavior, not to
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establish broad codec compatibility.
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All rows have licence **CC0-1.0 (fixture data only)**.
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| Fixture | SHA-256 | Expected duration and streams | Expected metadata | Generated by / purpose |
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| -------------------------- | ------------------------------------------------------------------ | ------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------- |
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| `pattern-av.mp4` | `3bd192d1b6cc9f1adad0cdbadbe82c61a5ae1789ce99102fcfb2011f1e1e9927` | 2.000 s; H.264 160×90 at 12 fps; mono AAC 16 kHz | title `Generated AV fixture` | `testsrc2` + 440 Hz `sine`, x264/AAC; primary import, probe, preview and conversion smoke |
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| `compatible-a.mp4` | `93f5c81e90e592217b7d98204fbc5631602055f782659a44390db64c6f125fd2` | 1.000 s; H.264 128×72 at 10 fps; mono AAC 16 kHz | no semantic tags | red `color` + 330 Hz `sine`, x264/AAC; first stream-copy concat clip |
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| `compatible-b.mp4` | `34a49f3f0dbfa3c90562524c1762e360fddce55de8e1fa2ead3a405927c2eff2` | 1.000 s; H.264 128×72 at 10 fps; mono AAC 16 kHz | no semantic tags | blue `color` + 550 Hz `sine`, same settings as A; second stream-copy concat clip |
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| `different-dimensions.mp4` | `018be12c1c13ca2b196b3e30996d712cc3174ddb5a2225e65c0acf25b94ca20d` | 1.000 s; H.264 96×96 at 10 fps; mono AAC 16 kHz | no semantic tags | `testsrc2` + 660 Hz `sine`; incompatible concat, crop and resize |
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| `tone.wav` | `0fd1f54d6be2f1cc7fd778775dd29cf184770d3716cf3394bf03ed54ac264c3c` | 1.000 s; mono PCM signed 16-bit LE, 16 kHz | title `Generated tone` | 440 Hz `sine`, PCM; waveform and lossless audio output |
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| `tone.mp3` | `68e45aefbe931a1ec3a9566713c80da64e58e379efe8ef86e8a7b846391334ce` | 1.080 s; mono MP3, 16 kHz | title `Generated tone` | 440 Hz `sine`, LAME 32 kbit/s; MP3 input/output |
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| `tone.flac` | `3f27e37b4d4c17c7ac1c3131c21fbe561c0d4637610e615fc96ff12b2870a5f8` | 1.000 s; mono FLAC, 16 kHz | title `Generated tone` | 440 Hz `sine`, FLAC level 5; FLAC input/output |
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| `pattern.webm` | `0613c85e11dffd72f166a7cdba03b57e9b293acd9edb8b308d4ec0feaf19ff8e` | 1.016 s; VP8 128×72 at 10 fps; mono Vorbis 16 kHz | title `Generated WebM fixture` | `testsrc2` + 440 Hz `sine`, libvpx/Vorbis; WebM and alternate-codec path |
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| `subtitle.srt` | `f36e5e9dd09da79774e7d4288bc177a273e63bc678132a23ee0b756184dd0f91` | cue 0.100–0.700 s; UTF-8 text | cue text `Generated subtitle` | literal generated text; SRT import and shift |
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| `subtitle.vtt` | `6e19fc5920479512739e126433c7d80fbd168fc8a34786a30d2e270f48da8bff` | cue 0.100–0.700 s; UTF-8 text | cue text `Generated subtitle` | literal generated text; WebVTT import and shift |
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| `subtitle.ass` | `cb1c44b5808a5aaa173d756d0b819b282138f73ce50ca9c883ee377eb646ddd8` | dialogue 0.100–0.700 s; UTF-8 text | 128×72 script, local generic `sans-serif` style | literal generated text; ASS parsing and local-font burn-in path |
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| `metadata.mp4` | `372d81c7bcaae67c09042fda95860902eb728374301ae97848e536a27b065dcd` | 1.000 s; same H.264/AAC streams as `compatible-a.mp4` | title `Metadata fixture`; artist `add ideas test generator`; comment `Local generated media` | stream-copy remux of A with tags; metadata round trip/removal |
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| `chapters.mp4` | `4f1b2bd90d1a041c90d325805e42a76518b6569f93715dbd711773cdedfb1222` | 1.000 s; H.264, AAC and MP4 chapter-data stream; chapters 0–0.5 s and 0.5–1.0 s | title `Chapter fixture`; chapter titles `First`, `Second` | stream-copy remux of B with generated FFMETADATA; chapter inspection/export |
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| `attached-cover.mp3` | `62fe9916406bbd9b25213f1aede0791ad382b235e425a42ea463f58c403588c3` | 1.080 s; mono MP3 plus 32×32 PNG with `attached_pic=1` | title `Attached cover fixture`; cover title/comment | 440 Hz `sine` + generated yellow `color` PNG; attachment/cover-art stream handling |
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| `truncated.mp4` | `c7e91f4a3d1e67bc1bcba2e7511299de5bda2867ba886d1bec786d1f60cfe93a` | invalid: first 128 bytes of `compatible-a.mp4`; no usable streams | none expected | bounded `head -c 128`; safe malformed-input diagnostics and cleanup |
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`generated/SHA256SUMS` is the canonical machine-checkable copy of these
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digests. Verify it from its directory:
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```sh
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(cd tests/fixtures/generated && sha256sum -c SHA256SUMS)
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```
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62fe9916406bbd9b25213f1aede0791ad382b235e425a42ea463f58c403588c3 attached-cover.mp3
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4f1b2bd90d1a041c90d325805e42a76518b6569f93715dbd711773cdedfb1222 chapters.mp4
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93f5c81e90e592217b7d98204fbc5631602055f782659a44390db64c6f125fd2 compatible-a.mp4
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34a49f3f0dbfa3c90562524c1762e360fddce55de8e1fa2ead3a405927c2eff2 compatible-b.mp4
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018be12c1c13ca2b196b3e30996d712cc3174ddb5a2225e65c0acf25b94ca20d different-dimensions.mp4
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372d81c7bcaae67c09042fda95860902eb728374301ae97848e536a27b065dcd metadata.mp4
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3bd192d1b6cc9f1adad0cdbadbe82c61a5ae1789ce99102fcfb2011f1e1e9927 pattern-av.mp4
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0613c85e11dffd72f166a7cdba03b57e9b293acd9edb8b308d4ec0feaf19ff8e pattern.webm
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cb1c44b5808a5aaa173d756d0b819b282138f73ce50ca9c883ee377eb646ddd8 subtitle.ass
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f36e5e9dd09da79774e7d4288bc177a273e63bc678132a23ee0b756184dd0f91 subtitle.srt
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6e19fc5920479512739e126433c7d80fbd168fc8a34786a30d2e270f48da8bff subtitle.vtt
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3f27e37b4d4c17c7ac1c3131c21fbe561c0d4637610e615fc96ff12b2870a5f8 tone.flac
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68e45aefbe931a1ec3a9566713c80da64e58e379efe8ef86e8a7b846391334ce tone.mp3
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0fd1f54d6be2f1cc7fd778775dd29cf184770d3716cf3394bf03ed54ac264c3c tone.wav
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c7e91f4a3d1e67bc1bcba2e7511299de5bda2867ba886d1bec786d1f60cfe93a truncated.mp4
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[Script Info]
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ScriptType: v4.00+
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PlayResX: 128
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PlayResY: 72
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[V4+ Styles]
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Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
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Style: Default,sans-serif,12,&H00FFFFFF,&H000000FF,&H00000000,&H00000000,0,0,0,0,100,100,0,0,1,1,0,2,8,8,8,1
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[Events]
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Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
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Dialogue: 0,0:00:00.10,0:00:00.70,Default,,0,0,0,,Generated subtitle
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1
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00:00:00,100 --> 00:00:00,700
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Generated subtitle
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WEBVTT
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00:00:00.100 --> 00:00:00.700
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Generated subtitle
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