Definition
HTMLVideoElement.requestVideoFrameCallback() defines VideoFrameCallbackMetadata
dictionary VideoFrameCallbackMetadata {
required DOMHighResTimeStamp presentationTime;
required DOMHighResTimeStamp expectedDisplayTime;
required unsigned long width;
required unsigned long height;
required double mediaTime;
required unsigned long presentedFrames;
double processingDuration;
DOMHighResTimeStamp captureTime;
DOMHighResTimeStamp receiveTime;
unsigned long rtpTimestamp;
};