Hi All, I am a long time ffmpeg user but still consider myself somewhat of a novice and always learning new things.
I have recently learned about phone calling which uses the SIP (Session Initiation Protocol) and SDP (Session Description Protocol) and have an application that I am stuck on. Specifically, we are using an Asterisk PBX (https://asterisk.org) and I want to send audio from a RTMP feed into a call via RTP. When I open a SIP call the Asterisk server gives me back this SDP which as I understand it is all the information needed to send the RTP (ports, IP address, codecs etc) v=0 o=- 1674874032 1674874032 IN IP4 10.1.20.135 s=Asterisk c=IN IP4 10.1.20.135 t=0 0 m=audio 17560 RTP/AVP 0 101 a=rtpmap:0 PCMU/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=ptime:20 a=maxptime:140 a=sendrecv I am used to command lines in FFMPG and I am trying to get it set up correctly: ffmpeg -i rtmp://<my server> -vn -ar 8000 -codec:a pcm_mulaw -f rtp -payload_type 0 rtp://23.177.208.145:17560 When I run the above command I see: SDP: v=0 o=- 0 0 IN IP4 127.0.0.1 s=No Name c=IN IP4 10.1.20.135 t=0 0 a=tool:libavformat 60.20.100 m=audio 17560 RTP/AVP 0 b=AS:128 So clearly there is some type of a mismatch from what I need and what I am doing. We see the server receiving the data on port 17560 but it’s just sitting in the UDP queue, Asterisk is never pulling the data so I am thinking something is missing. Is there a way for me to “read in” a SDP file (I can write it to a local file prior to invoking ffmpeg) from ffmpeg so it will setup properly (destination, codecs, etc) as well as use my “RTMP” as the source input? Ideally I could just drop the SDP file on the filesystem, invoke FFMPEG with the SDP file + my input RTMP url and away it goes. Thanks for taking the time to read this. -Rob _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
