- From: guest271314 via GitHub <sysbot+gh@w3.org>
- Date: Tue, 21 Jul 2020 01:51:28 +0000
- To: public-webrtc-logs@w3.org
Note that frame rate necessarily must change when input is variable width and height frames https://plnkr.co/edit/4Tb91b?preview, https://plnkr.co/edit/Axkb8s?preview. [webm-writer](https://github.com/thenickdude/webm-writer-js) which decodes WebP image VP8 frame has the ability to set frame rate https://plnkr.co/edit/Inb676?preview, in pertinent part, setting frame rate manually
```
for (const blobURL of media) {
await new Promise(async resolve => {
video.addEventListener("pause", e => {
controller.close();
const currentFrames = frames[frames.length - 1];
const [frame] = currentFrames;
frame.duration = video.currentTime - frame.duration;
frame.frameRate = (frame.duration * 60) / currentFrames.length -1;
done.then(resolve);
}, {
once: true
});
video.src = blobURL;
});
}
console.log(frames);
for (const frame of frames) {
const [{
duration, frameRate, width, height
}] = frame;
console.log(frameRate);
const framesLength = frame.length;
const frameDuration = Math.ceil((duration * 1000) / framesLength);
for (let i = 1; i < framesLength; i++) {
videoWriter.addFrame(frame[i], frameDuration, width, height);
}
}
```
`MediaRecorder` could add that option. The requirement is possible now using various means, include `pause()`, `resume()`; seeking to every frame https://bugs.chromium.org/p/chromium/issues/detail?id=1065675.
--
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Received on Tuesday, 21 July 2020 01:51:31 UTC