Chromium implements `requestFrame()` on the `MediaStreamTrack`. Firefox still implements `requestFrame()` on `MediaStream`. Nonetheless when `autoplay` is set on an HTML `<video>` element and the `MediaStream` from `canvas.captureStream()` is set as `srcObject` of the `<video>` and `requestFrame()` is executed the `<video>` `currentTime` does not increment. ``` <canvas style="border:1px solid green"></canvas> <video controls autoplay></video> <script> const canvas = document.querySelector("canvas"); const offscreen = canvas.transferControlToOffscreen(); const stream = canvas.captureStream(0); const worker = new Worker("firefoxNightlyOffscreenCanvasNotVisibleIncorrectWidthAndHeightWorker.js"); worker.onmessage = e => { const { width, height } = e.data; const stream = canvas.captureStream(); document.querySelector("video").srcObject = stream; let n = 0; const requestFrame = _ => { if (canvas.width !== width && canvas.height !== height) { console.assert(canvas.width === width && canvas.height === height, [width, height, canvas.width, canvas.height]); requestAnimationFrame(requestFrame); } else { // document.querySelector("video").currentTime remains at 0 console.log(canvas.width === width && canvas.height === height, [width, height, canvas.width, canvas.height], {n}, document.querySelector("video").currentTime); stream.getVideoTracks()[0].requestFrame(); ++n; requestAnimationFrame(requestFrame); } } requestAnimationFrame(requestFrame); } worker.postMessage({ offscreen }, [offscreen]); </script> ``` -- GitHub Notification of comment by guest271314 Please view or discuss this issue at https://github.com/w3c/mediacapture-fromelement/issues/84#issuecomment-574307512 using your GitHub accountReceived on Tuesday, 14 January 2020 18:23:12 UTC
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