19 lines
942 B
Markdown
19 lines
942 B
Markdown
# Chromium MediaRecorder fixture provenance
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`chromium-webm-opus.webm` is the concatenation of ten successive 250 ms-ish
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data blobs emitted by a real Chromium `MediaRecorder` for
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`audio/webm;codecs=opus`; `chromium-webm-opus.json` records their exact byte
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lengths so tests can replay each browser event. The recording has leading
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silence followed by a 440 Hz signal, mirroring speech that begins after the
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hands-free VAD pre-roll is full.
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- Browser: Chromium 140.0.7339.16 (Playwright build v1187, arm64)
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- Generator: `testing/probes/generate_mediarecorder_fixture.js`
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- Timeslice request: 250 ms
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- Complete concatenated payload: WebM/Opus, accepted by ffmpeg 7.1.5
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- Complete payload SHA-256: `5585014ecad185511a727ccf47aa8b1ac70ea6f3efd7778309742bf88e6faf51`
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- First five chunks are treated as pre-speech by the test model; the production
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pre-roll retains only the most recent three.
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The fixture is generated data, not recorded speech.
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