1*d9f75844SAndroid Build Coastguard Worker# Video Frame Tracking Id 2*d9f75844SAndroid Build Coastguard Worker 3*d9f75844SAndroid Build Coastguard WorkerThe Video Frame Tracking Id extension is meant for media quality testing 4*d9f75844SAndroid Build Coastguard Workerpurpose and shouldn't be used in production. It tracks webrtc::VideoFrame id 5*d9f75844SAndroid Build Coastguard Workerfield from the sender to the receiver to gather referenced base media quality 6*d9f75844SAndroid Build Coastguard Workermetrics such as PSNR or SSIM. 7*d9f75844SAndroid Build Coastguard WorkerContact <[email protected]> for more info. 8*d9f75844SAndroid Build Coastguard Worker 9*d9f75844SAndroid Build Coastguard Worker**Name:** "Video Frame Tracking Id" 10*d9f75844SAndroid Build Coastguard Worker 11*d9f75844SAndroid Build Coastguard Worker**Formal name:** 12*d9f75844SAndroid Build Coastguard Worker<http://www.webrtc.org/experiments/rtp-hdrext/video-frame-tracking-id> 13*d9f75844SAndroid Build Coastguard Worker 14*d9f75844SAndroid Build Coastguard Worker**Status:** This extension is defined to allow for media quality testing. It is 15*d9f75844SAndroid Build Coastguard Workerenabled by using a field trial and should only be used in a testing environment. 16*d9f75844SAndroid Build Coastguard Worker 17*d9f75844SAndroid Build Coastguard Worker### Data layout overview 18*d9f75844SAndroid Build Coastguard Worker 1-byte header + 2 bytes of data: 19*d9f75844SAndroid Build Coastguard Worker 20*d9f75844SAndroid Build Coastguard Worker 0 1 2 21*d9f75844SAndroid Build Coastguard Worker 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 22*d9f75844SAndroid Build Coastguard Worker +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 23*d9f75844SAndroid Build Coastguard Worker | ID | L=1 | video-frame-tracking-id | 24*d9f75844SAndroid Build Coastguard Worker +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 25*d9f75844SAndroid Build Coastguard Worker 26*d9f75844SAndroid Build Coastguard WorkerNotes: The extension shoud be present only in the first packet of each frame. 27*d9f75844SAndroid Build Coastguard WorkerIf attached to other packets it can be ignored.