Definition
WebRTC Encoded Transform defines RTCEncodedVideoFrameMetadata
dictionary RTCEncodedVideoFrameMetadata {
unsigned long long frameId;
sequence<unsigned long long> dependencies;
unsigned short width;
unsigned short height;
unsigned long spatialIndex;
unsigned long temporalIndex;
unsigned long synchronizationSource;
octet payloadType;
sequence<unsigned long> contributingSources;
long long timestamp; // microseconds
unsigned long rtpTimestamp;
DOMString mimeType;
};