[streaming] RTP streaming noise when transcoding to Ulaw
Beñat Urteaga <[email protected]> Mon, 3 Dec 2012 09:19:01 +0100
| Newsgroups | gmane.comp.video.videolan.vls.general |
|---|---|
| Message-ID | <BFF5B4E4912E58409575205E00B8CE0E057FAE28292C@exchsvr.traintic.com> |
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Hi all,
I'm trying to get a mp3 audio file streamed with RTP in PCMU. So I'm trying=
to transcode the file to Ulaw (transcode{acodec=3Dulaw,samplerate=3D8000,c=
hannels=3D1,ab=3D64}).
The whole sout string I'm using is: :#sout=3Dtranscode{vcodec=3Dnone,aco=
dec=3Dulaw,ab=3D64,channels=3D1,samplerate=3D8000}:rtp{dst=3D1.2.3.4,port=
=3D5004}.
Which does create an RTP stream, however, the audio sent has a periodic noi=
se which makes the song uncrompehensible...
If I use already converted files to stream via RTP, the song is ok at recep=
tion, but unfortunately, this can't be done with VLC since when trying to c=
onvert it, the file created has that periodic noise.
For this purpose I've used ffmpeg with the command: #ffmpeg -i <input_file>=
-ac 1 -ar 8000 -ab 64 -acodec pcm_mulaw <output_file> -f mulaw and I even =
got an RTP stream with ffmpeg:
#ffmpeg -re -i <input_file> -ac 1 -ar 8000 -ab 64 -acodec pcm_mulaw <output=
_file> -f mulaw -f rtp rtp://1.2.3.4:5004.
However, I must be able to play/pause/resume create playlists and so on, an=
d I'm very interested in VLCs features for doing so.
I already have posted this questions at the videolan forums but even if I w=
as helped a little bit (I was told the problem must be when downsampling or=
remixing), I wasn't able to find a solution, so maybe I could find it here=
...
Thanks a lot,
Ben.
P.S: I'm using vlc 1.1.9 The Luggage on an Ubuntu 11.04 virtual machine.
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<p class=3DMsoNormal>Hi all,<o:p></o:p></p>
<p class=3DMsoNormal><o:p> </o:p></p>
<p class=3DMsoNormal><span lang=3DEN-US>I’m trying to get a mp3 audio=
file streamed
with RTP in PCMU. So I’m trying to transcode the file to Ulaw
(transcode{acodec=3Dulaw,samplerate=3D8000,channels=3D1,ab=3D64}).<o:p></o:=
p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>The whole sout string I’m usi=
ng is:
:#sout=3Dtranscode{vcodec=3Dnone,acodec=3Dulaw,ab=3D64,ch=
annels=3D1,samplerate=3D8000}:rtp{dst=3D1.2.3.4,port=3D5004}.
<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>Which does create an RTP stream, ho=
wever,
the audio sent has a periodic noise which makes the song uncrompehensible&#=
8230;<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>If I use already converted files to=
stream
via RTP, the song is ok at reception, but unfortunately, this can’t b=
e done
with VLC since when trying to convert it, the file created has that periodi=
c
noise.<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>For this purpose I’ve used ff=
mpeg with the
command: #ffmpeg -i <input_file> -ac 1 -ar 8000 -ab 64 -acodec pcm_mu=
law
<output_file> -f mulaw and I even got an RTP stream with ffmpeg: <o:p=
></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>#ffmpeg –re -i <input_file=
> -ac 1 -ar
8000 -ab 64 -acodec pcm_mulaw <output_file> -f mulaw -f rtp
rtp://1.2.3.4:5004.<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>However, I must be able to
play/pause/resume create playlists and so on, and I’m very interested=
in VLCs
features for doing so. <o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>I already have posted this question=
s at the
videolan forums but even if I was helped a little bit (I was told the probl=
em
must be when downsampling or remixing), I wasn’t able to find a solut=
ion, so
maybe I could find it here…<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>Thanks a lot,<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>Ben.<o:p></o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US>P.S: I’m using vlc 1.1.9 The =
Luggage on an
Ubuntu 11.04 <span style=3D'color:#1F497D'>virtual </span>machine.<o:p></o:=
p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US><o:p> </o:p></span></p>
<p class=3DMsoNormal><span lang=3DEN-US><o:p> </o:p></span></p>
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