>On Monday, July 10, 2017 at 3:28:07 PM UTC+12, Randell Jesup wrote: >I added these stats originally, and they are now mostly superseded by the >stats provided by VideoPlaybackQuality. So I support their removal (in fact >I suggested to Tim that he remove them). > >Adding telemetry to learn how often these stats are used in the wild seems >like a good idea. I'd be surprised if these are still used, but I'm happy >to be proved wrong!
I know various webrtc app developers have asked about how to determine if video elements are showing frames, which they've used as "is video still flowing" indicators, among other things. We can try to find alternative ways to get them what they need; our tests for example use it to know when to sample the image to see if media is successfully flowing end-to-end, and to know when to sample with a canvas to see if the "right" color is there (IIRC) >Randall: doesn't VideoPlaybackQuality support the use cases you're concerned >about? If VideoPlaybackQuality is supported for srcObject streams, and totalVideoFrames works (frames as received from the MediaStream by the video element), then it can substitute. The other fields in the VideoPlaybackQuality object are likely much harder to hook up (or define) for WebRTC or MediaStream/srcObject inputs in general - it would imply additional streams of metadata flowing independently of the actual frames (i.e. droppedFrames would need to be updated even though no frame was sent down the stream from the PeerConnection.) And there are other sources of MediaStreams, in particular mediaelement.captureStream() and canvas.captureStream(); someone needs to define how those interact with srcObject and VideoPlaybackQuality (and fun cases like PeerConnection -> MediaStream -> MediaElement -> canvas (webGL, etc) -> captureStream -> MediaElement) I presume no one working on VideoPlaybackQuality was thinking about non-streaming sources for video when they defined it. -- Randell Jesup, Mozilla Corp remove "news" for personal email _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
