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  1. README.md
docs/native-code/rtp-hdrext/video-frame-tracking-id/README.md

Video Frame Tracking Id

The Video Frame Tracking Id extension is meant for media quality testing purpose and shouldn't be used in production. It tracks webrtc::VideoFrame id field from the sender to the receiver to gather referenced base media quality metrics such as PSNR or SSIM. Contact jleconte@google.com for more info.

Name: “Video Frame Tracking Id”

Formal name: http://www.webrtc.org/experiments/rtp-hdrext/video-frame-tracking-id

Status: This extension is defined to allow for media quality testing. It is enabled by using a field trial and should only be used in a testing environment.

Data layout overview

 1-byte header + 2 bytes of data:

  0                   1                   2
  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 |  ID   | L=1   |    video-frame-tracking-id    |
 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Notes: The extension should be present only in the first packet of each frame. If attached to other packets it can be ignored.