[whatwg] Exposing framerate / statistics of <video> playback and related feedback
ian at hixie.ch
Thu Nov 29 15:51:37 PST 2012
On Tue, 1 May 2012, Charles Pritchard wrote:
> The list looked at having a (canvas) ctx.stream = mediaElement; option
> to better copy frames from a media stream into Canvas. I don't think
> that the assignment operator will work, but it does seem like we could
> optimize our drawImage calls to only happen when needed. At present, we
> simply would run requestAnimationFrame. But, if a video stream is
> operating on a slower frame rate than rAF, then the drawImage + rAF
> method will be wasteful.
> I've suggested an onframeready event; it seems as though that event
> could also carry the number of dropped frames.
I haven't added this, because copying a video one frame at a time doesn't
seem like an efficient way to do anything. Some sort of mechanism like
what I had proposed for WebRTC (not sure if it's still in there) seems
like a more solid solution, letting the browser do all the heavy lifting
(potentially off the main thread).
Ian Hickson U+1047E )\._.,--....,'``. fL
http://ln.hixie.ch/ U+263A /, _.. \ _\ ;`._ ,.
Things that are impossible just take longer. `._.-(,_..'--(,_..'`-.;.'
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