Commits on Apr 28, 2024

1. Fix VP9 decoding on iOS …

   The current implementation of the VP9 payloader produces payloads that
   are not compatible with iOS. This is because the payloader provides
   only the muxing strategy called "flexible mode".
   
   According to the VP9 RFC draft, there are two ways to wrap VP9 frames
   into RTP packets: the "flexible mode" and the "non-flexible mode", with
   the latter being the preferred one for live-streaming applications. In
   particular, all browsers encodes VP9 RTP packets in the "non-flexible
   mode", while iOS supports decoding RTP packets in this mode only, and
   this is probably a problem shared by other implementations.
   
   This patch improves the VP9 payloader by adding support for the
   "non-flexible mode". The "flexible mode" is retained and a flag is
   provided to perform the switch between the two modes.

   

   aler9 committed Apr 28, 2024
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