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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 shoud be present only in the first packet of each frame.
+If attached to other packets it can be ignored.
+\ No newline at end of file