The VideoLAN Forums

Posted: **09 Feb 2012 08:50**

Hi all,
I'm trying to stream video and transcoded ulaw audio to different IP addresses using RTP.
I'm using VLC 1.0.6 and after having looked quite a lot for a solution I've read that it's recommended to get the input audio in 8 kHz mono format. Is that still true? or new VLC versions have overcome this issue?
I've tried to do it like this:

Code: Select all

:sout=#transcode{acodec=ulaw,ab=64,channels=1,samplerate=8000}:duplicate{dst=rtp{dst=IPa,port=5004,mux=ts},select="audio",dst=rtp{dst=IPb,port=5004,mux=ts},select="video"}

but no success...
I've seen that these error messages might show where the problem is...

Code: Select all

...
stream_out_duplicate debug: duplicated a new stream codec=ulaw (es=1 group=0)
main debug: adding a new input
mux_ts debug: adding input codec=ulaw pid=68
main error: cannot add this stream
stream_out_rtp error: cannot add this stream to the muxer
stream_out_duplicate debug:     - failed for output 0
stream_out_duplicate debug:     - ignored for output 1
main debug: removing module "mpeg_audio"
main debug: removing module "araw"
main debug: Filter 'mpgatofixed32' (0x85ca3b0) removed from chain
main debug: removing module "mpgatofixed32"
...

Any tip?

Thank you!

Posted: **09 Feb 2012 08:53**

You can't pass G.711 inside MPEG-TS.

Posted: **09 Feb 2012 09:14**

Thank you Rémi,
but RTP only supports PS/TS, doesn't it?
I've tried PS and RAW and i get these error messages:

main mux error: cannot add this stream
stream_out_rtp stream out error: cannot add this stream to the muxer
main packetizer error: cannot create packetizer output (mpga)

Is it impossible to do this? or there must be some code added?
Thanks!

Posted: **09 Feb 2012 14:50**

sorry, for maybe becoming boring but any idea about how can I make this work?
It's necessary that I get this working....

Thank you!

Posted: **09 Feb 2012 14:55**

This might be of some use: http://www.videolan.org/streaming-features.html

Posted: **09 Feb 2012 15:12**

Thanks n_skid11,
but I've already had a look at this. That's why I'm asking if there's any posibility to get this work by adding some code or whatever...

Posted: **15 Feb 2012 12:28**

Alright, I've seen that in the new versions of VLC it does support ulaw transcoding with RTP so... THANKS TO THE DEVELOPERS!

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