The VideoLAN Forums

Hello all,

I would like to know if it is possible to listen to two simultaneous audio streams via RTP. It seems to be possible, but I can't make it work.

I tried to do that in the two following ways:

Via VLC User Interface:
- went to "Media" -> "Advanced Open File" -> "Network" and entered the first stream address.
- then went to "show more options" -> "Play another media synchronously" and entered the second stream address.

and via SDP file:
v=0
o=root 282212517 282212517 IN IP4 127.0.0.1
s=music.sdp
c=IN IP4 127.0.0.1
t=0 0
m=audio 8000 RTP/AVP 0
a=rtpmap:0 PCMU/8000
m=audio 8002 RTP/AVP 0
a=rtpmap:0 PCMU/8000

In both cases VLC shows me (in the "Media Information ..." window) that I have two streams, but it only plays the first one. Am I missing something or does VLC not support this feature?

thanks,
ps: using VLC 0.9.8a

You can select which audio track to play from the audio track menu.

Thanks for your answer.

This is a nice feature that I didn't know. But I would like to MIX both streams and couldn't figure out how to do that. Is that possible?

Thanks for your answer.

This is a nice feature that I didn't know. But I would like to MIX both streams and couldn't figure out how to do that. Is that possible?

No.

If you want to mix, you should open two separate streams, and let the OS do the job.

Hello,

Thanks again for your answers.

That is what I'm doing now, letting the OS mix them. However, this is not a very nice solution because I have to sync both audio streams, and to do that I have to send both streams and start both VLCs at the same time. Unfortunately, several things can delay one of the streams and desynchronize them.

I was expecting that VLC could sync them through RTCP packets, sent along with the streams. I'm looking forward to this feature in future releases.

Thanks,