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Implement RTP Reference Picture Selection Indication

Benjamin Gaignard requested to merge benjamin.gaignard1/gstreamer:vp8_rpsi into main

The RPSI is a payload-specific feedback message defined within the RTCP-based feedback format. The RPSI message is generated by a receiver and can be used in two ways. Either it can signal a preferred reference picture when a loss has been detected by the decoder or it can be used as positive feedback information to acknowledge correct decoding of certain reference pictures.

Full description for VP8: https://datatracker.ietf.org/doc/html/rfc7741#section-5.1

Description RPSI in RTP: https://datatracker.ietf.org/doc/html/rfc4585#section-6.3.3

Edited by Olivier Crête

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