[FFmpeg-user] Symmetric RTP / socket reuse flag
renaud.schoonbroodt at gmail.com
Sun Sep 9 19:29:12 EEST 2018
I am implementing a SIP user agent (softphone) in C++ where the media
encoding and decoding is handled by ffmpeg. I basically have one PCMU
encoder and one PCMU decoder. Taken separately they both works fine.
To cope with NAT traversal issues, I need to do Symmetric RTP
Basically it means that my encoder and decoder need to use the same port.
But when I enable both encoder and decoder one fails I guess because the
port can't be reused. Again, enabled separately it works like a charm.
I see the existence of the "reuse_socket" AVOption for UDP socket. But I
have very little experience with the ffmpeg API and don't know how to
access UDPContext form an AVFormatContext or AVCodecContext.
I have also seen the "reuse" flag for URL but it doesn't seem to work with
Does someone already succeed in doing this ? Am I looking in the right
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