sourceTrackIDs The identifiers of tracks that contain source video. Declarationvar sourceTrackIDs: [NSNumber] { get } See AlsoAccessing source dataattach(_:to:)sourceFrame(byTrackID:)sourceReadOnlyPixelBuffer(byTrackID:)sourceReadySampleBuffer(byTrackID:)sourceSampleBuffer(byTrackID:)sourceSampleDataTrackIDssourceTaggedDynamicBuffers(byTrackID:)sourceTimedMetadata(byTrackID:)