RTCVideo*Stats: Video Device Errors

[aboba]

Currently statistics relating to video tracks do not measure video device errors, such as:

o Video Camera: Count of frames dropped due to wrong format received o Video Camera: Count of frames dropped due to pipeline not ready o Video Camera: Count of frames dropped due unexpected conditions o Video Camera: Overall delay due to camera opening including retries

[vr000m]

Where is this measured? between the camera and the encoder?

[jan-ivar]

Seems out of scope to me, unless we're planning a getStats API in mediacapture. See https://github.com/w3c/webrtc-stats/issues/429#issuecomment-483694795

[henbos]

Can we split these up into...

• Device errors (mediacapture issue?).
• Error where the RTCRtpSender / encoder / packetizer isn't getting what it expects (webrtc-stats issue).
• Error where the RTCRtpReceiver isn't getting what it is expecting, i.e. packets discarded or decode failures (webrtc-stats).

[henbos]

@aboba Is this something you "want" to talk about at TPAC?