27 lines
1.1 KiB
Markdown
27 lines
1.1 KiB
Markdown
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# Video Frame Tracking Id
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The Video Frame Tracking Id extension is meant for media quality testing
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purpose and shouldn't be used in production. It tracks webrtc::VideoFrame id
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field from the sender to the receiver to gather referenced base media quality
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metrics such as PSNR or SSIM.
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Contact <jleconte@google.com> for more info.
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**Name:** "Video Frame Tracking Id"
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**Formal name:**
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<http://www.webrtc.org/experiments/rtp-hdrext/video-frame-tracking-id>
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**Status:** This extension is defined to allow for media quality testing. It is
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enabled by using a field trial and should only be used in a testing environment.
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### Data layout overview
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1-byte header + 2 bytes of data:
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0 1 2
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| ID | L=1 | video-frame-tracking-id |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Notes: The extension shoud be present only in the first packet of each frame.
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If attached to other packets it can be ignored.
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