- From: Andreas Pehrson via GitHub <sysbot+gh@w3.org>
- Date: Tue, 29 Aug 2017 12:12:24 +0000
- To: public-webrtc-logs@w3.org
Pehrsons has just created a new issue for https://github.com/w3c/webrtc-pc: == Deciding on resolutions with scaleResolutionDownBy == The spec mentions constraints on the value of `scaleResolutionDownBy` but not how it applies when actually scaling video frames. I have a couple of cases in mind where it is unclear what resolution will be sent over the wire: - Common input `640x480`, odd `scaleResolutionDownBy` `x9.0`. - You can't scale to `71.111x53.333` - Odd input (say canvas or application sharing), e.g., `705x529`, `scaleResolutionDownBy` `x2.0`. - You can't scale to `78.333x58.778` - The encoder doesn't handle scaling to certain resolutions - webrtc.org requires that all layers have identical aspect ratio, see [1], so a scaling factor where the result has to be rounded (like the two above) need a bit more massaging to be accepted. Not sure about other implementations or hardware encoders. [1] http://searchfox.org/mozilla-central/rev/b318c7dca7392bd16c0b11929f55b1be133f0b31/media/webrtc/trunk/webrtc/modules/video_coding/codecs/vp8/simulcast_encoder_adapter.cc#62 Please view or discuss this issue at https://github.com/w3c/webrtc-pc/issues/1564 using your GitHub account
Received on Tuesday, 29 August 2017 12:12:22 UTC