I'm writing an application on an embedded device which receives an RTP stream which carries G.729, PCM or H.264. The packets arrive to my application as a char* to the RTP packet. I would like to be able to see or listen to the stream (as a test), but on this device I don't have player. I thought I may forward this stream to a socket and play the RTP stream somewhere else, like on a Linux machine running a player. Would this be possible? I don't have RTSP, only RTP. Is VLC, for instance, a possible way to do this? Can I simply send the RTP packets to the socket to play them on the other side? Thanks!
3 Answers
0
votes
no, you cannot. simple RTP doesn't contain any info about the stream format etc., only info about the packet itself: sequence number, timestamp, additional synchronization info. the simplest way to stream RTP is RTP/MPEG TS (MPEG Transport Stream).
unfortunately I don't know ready to use solution. VLC can stream (and play) such streams over UDP from a file, so it takes required info from file container format. Such solution could take external stream description in SDP format and your actual RTP packets
[EDIT] btw, it's weird that you receive just RTP stream w/o any description of its format, usually its description is provided somehow by RTSP, MPEG-TS or something else
1
votes
example of SDP that contains H.264 stream:
Server: rtsp server
Content-type: application/sdp
Content-base: rtsp://[some URL]
Content-length: 505
v=0
o=rtsp 1295996924 1590699491 IN IP4 0.0.0.0
s=RTSP Session
i=rtsp server
c=IN IP4 192.168.1.2
t=0 0
a=control:*
m=audio 0 RTP/AVP 97
a=rtpmap: 97 mpeg4-generic/8000/1
a=fmtp: 97 streamtype=5; profile-level-id=15; objectType=2; mode=AAC-hbr;
a=range:npt=now-
a=control:trackID=0
m=video 0 RTP/AVP 96
a=rtpmap:96 H264/90000
a=fmtp:96 profile-level-id=42E015; sprop-parameter-sets=Z0LgFdoHgtE=,aM4wpIA=; packetization-mode=1
a=range:npt=now-
a=framesize:96 480-352
a=control:trackID=1
