WPT
wpt / mediacapture-record / MediaRecorder-bitrate.https.html
Spec: MediaStream Recording ↗
Runs: Chrome 155.0.8039.0 (wpt@6ec9fd59f, 2026-09-03) | Firefox 157.0a1 (wpt@6ec9fd59f, 2026-09-03) | Safari 251 preview (wpt@5ce815a83, 2026-08-27) | Ladybird 1.0-795e1 (wpt@7e3d005d7, 2026-09-03) | Servo Servo 0.6 (wpt@09159dcb3, 2026-09-02) | Blitz 188486089 (wpt@a95401e4e, 2026-09-02)
View on the Blitz WPT dashboard | Open test on wpt.live | wpt.fyi
| Chrome | Firefox | Safari | Ladybird | Servo | Blitz | |
|---|---|---|---|---|---|---|
| Total | 18/18 | 18/18 | 18/18 | 0/18 | 0/18 | NOT RUN |
| Subtest | Chrome | Firefox | Safari | Ladybird | Servo | Blitz |
|---|---|---|---|---|---|---|
| Passing no bitrate config results in defaults | PASS | PASS | PASS | FAIL | FAIL | — |
| Passing bitsPerSecond:0 results in targets close to 0 | PASS | PASS | PASS | FAIL | FAIL | — |
| Passing only audioBitsPerSecond:0 results in 0 for audio, default for video | PASS | PASS | PASS | FAIL | FAIL | — |
| Passing only videoBitsPerSecond:0 results in 0 for video, default for audio | PASS | PASS | PASS | FAIL | FAIL | — |
| Passing bitsPerSecond:0 overrides audio/video-specific values | PASS | PASS | PASS | FAIL | FAIL | — |
| Passing bitsPerSecond overrides audio/video zero values | PASS | PASS | PASS | FAIL | FAIL | — |
| Passing bitsPerSecond sets audio/video bitrate values | PASS | PASS | PASS | FAIL | FAIL | — |
| Passing only audioBitsPerSecond results in default for video | PASS | PASS | PASS | FAIL | FAIL | — |
| Passing only videoBitsPerSecond results in default for audio | PASS | PASS | PASS | FAIL | FAIL | — |
| Passing videoBitsPerSecond for audio-only stream still results in something for video | PASS | PASS | PASS | FAIL | FAIL | — |
| Passing audioBitsPerSecond for video-only stream still results in something for audio | PASS | PASS | PASS | FAIL | FAIL | — |
| Passing bitsPerSecond for audio-only stream still results in something for video | PASS | PASS | PASS | FAIL | FAIL | — |
| Passing bitsPerSecond for video-only stream still results in something for audio | PASS | PASS | PASS | FAIL | FAIL | — |
| Selected default track bitrates are not changed by start() | PASS | PASS | PASS | FAIL | FAIL | — |
| Passed-in track bitrates are not changed by start() | PASS | PASS | PASS | FAIL | FAIL | — |
| Passing bitsPerSecond for audio/video stream does not change track bitrates in start() | PASS | PASS | PASS | FAIL | FAIL | — |
| Passing bitsPerSecond for audio stream sets video track bitrate to 0 in start() | PASS | PASS | PASS | FAIL | FAIL | — |
| Passing bitsPerSecond for video stream sets audio track bitrate to 0 in start() | PASS | PASS | PASS | FAIL | FAIL | — |