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Add rtp timestamp and capture time to RTCEncodedVideoFrameMetadata #137

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Add rtp timestamp and capture time to RTCEncodedVideoFrameMetadata #137

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Add rtp timestamp and capture time to RTCEncodedVideoFrameMetadata
nisse-work Jun 13, 2022
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Jun 15, 2022
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Expand Up @@ -287,6 +287,8 @@ enum RTCEncodedVideoFrameType {

dictionary RTCEncodedVideoFrameMetadata {
long long frameId;
unsigned long rtpTimestamp; // RTP timestamp.
DOMHighResTimeStamp captureTime;
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Not sure what type and name to use for best consistency. VideoFrame uses the name "timestamp" and the "long long" type, https://w3c.github.io/webcodecs/#dom-videoframe-timestamp. While VideoFrameMetadata use name "captureTime" and type "DOMHighResTimeStamp", see https://wicg.github.io/video-rvfc/#dom-videoframemetadata-capturetime.

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@fippo fippo Jun 14, 2022 •
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I wonder if we should have rtpTimestamp and payload type at the root level which frees up names like timestamp for metadata...

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I really don't have an informed opinion on naming (and typing). It's not clear to me why we have RTCEncodedVideoFrame.type and .timestamp, and all other metadata in RTCEncodedVideoFrameMetadata.

So I'll adapt to anything the w3c experts say.

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what clock is the capture timestamp in? (in particular for remotely-sourced frames or frames from files)?

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That's a very good question. For consistency, I'd prefer that it's whatever goes in https://w3c.github.io/webcodecs/#dom-videoframe-timestamp on correspponding unencoded frame, but docs aren't crystal clear on what clock that uses. It is marked as "nullable" there, so perhaps it's not provided in all cases?

sequence<long long> dependencies;
unsigned short width;
unsigned short height;
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