File: README.md

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# 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.