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Yeah I don't understand that part either. One reasoning I have stumbled upon seems to be that RTP transport tries to optimize transmission for every single byte, so they don't have the size field in the OBU, and instead of wanting to re-write the OBU header to add it on the RTP depacketizers side, they prefer to just add the Annex B size headers.
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LAV Filters - open source ffmpeg based media splitter and decoders
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