Why does the "reuse" option exists on the "udp" protocol in the first place? Why would it not apply to "rtp" also?
Here is the original patch proposal on udp: http://ffmpeg.org/pipermail/ffmpeg-devel/2006-October/thread.html#18946 > Sure. But then that does not solve the problem of RTCP mux and SDP > bundle, which normally would use the exact same IP address and port > number on the local end (and also on the far end, if set). I confirm the requirement is to send several RTP streams with FFmpeg with identical proto/src_ip/src_port/dst_ip/dst_port. > > > It's not that simple. The semantics of REUSEPORT varies between Linux > and BSD. IIRC, REUSEPORT was originally meant by BSD to allow > multiple processes to listen on the same multicast group, but then > Linux redefined it with radically different semantics, for receive > load-balancing purpose. They added SO_REUSEPORT_LB in BSD to mimic the Linux behavior. > > Repeating myself, but I don't see how that solves the problem. You > don't need REUSEADDR for two sockets to send to the same remote > IP/port, and you cannot rely on it to send from the same local > IP/port. It *does* work, at least on Linux: I can send several RTP streams from the exact same local IP/port (and _to_ the same IP/port too but that's not a problem in general as you point it) with either REUSEADDR or REUSEPORT options set. Here are ffmpeg strace traces for local RTCP port == local RTP port. The command sends a video stream to the following RTP URL (RTP and are sent from the same local source port): rtp://127.0.0.1:40000?localaddr=127.0.0.1&localport=22300&localrtcpport =22300&rtcpport=40000 without SO_REUSEPORT ==================== ... socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC, IPPROTO_IP) = 4 bind(4, {sa_family=AF_INET, sin_port=htons(22300), sin_addr=inet_addr("127.0.0.1")}, 16) = 0 getsockname(4, {sa_family=AF_INET, sin_port=htons(22300), in_addr=inet_addr("127.0.0.1")}, [128->16]) = 0 setsockopt(4, SOL_SOCKET, SO_SNDBUF, [32768], 4) = 0 socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC, IPPROTO_IP) = 5 bind(5, {sa_family=AF_INET, sin_port=htons(22300), in_addr=inet_addr("127.0.0.1")}, 16) = -1 EADDRINUSE (Address already in use) with SO_REUSEPORT ================= ... socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC, IPPROTO_IP) = 4 setsockopt(4, SOL_SOCKET, SO_REUSEPORT, [1], 4) = 0 bind(4, {sa_family=AF_INET, sin_port=htons(22300), sin_addr=inet_addr("127.0.0.1")}, 16) = 0 getsockname(4, {sa_family=AF_INET, sin_port=htons(22300), sin_addr=inet_addr("127.0.0.1")}, [128->16]) = 0 setsockopt(4, SOL_SOCKET, SO_SNDBUF, [32768], 4) = 0 socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC, IPPROTO_IP) = 5 setsockopt(5, SOL_SOCKET, SO_REUSEPORT, [1], 4) = 0 bind(5, {sa_family=AF_INET, sin_port=htons(22300), sin_addr=inet_addr("127.0.0.1")}, 16) = 0 Regards -- Camille _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
