[vlc] Re: basic question about codec

[Antoine Bardel]

Ok this makes things clearer.
so here, with this : '#transcode{vcodec=mp4v,vb 
> 
> 
> =4000,venc=ffmpeg{keyint=80,hurry-up,vt=800000},scale=1,acodec=mpga,ab=128,samplerate=44100}


I am choosing bith a video and an audio codec, no ? 
I don't see the point of choosing the audio codec if there are already 
sounds layer in a video codec.

thanks a lot for your help,

ps : does anyone know where I can find a list that would give all the key 
words corresponding to the codecs (ex : mp4v --> mpeg4, mpga--> mp3...etc ) 
thanks 




On 6/14/05, Sigmund Augdal <sigmunau at stud.ntnu.no> wrote:
> 
> On Tue, Jun 14, 2005 at 05:58:35PM +0200, Antoine Bardel wrote:
> > thanks a lot for your answer.
> >
> > But there's a thing I still don't understand :
> >
> > when I write : vcodec = mp4v, Am I choosing a video codec or a container 
> ?
> > same for acodec = mpga ?
> 
> The container format is selected with the mux= lines later in an ordinary
> sout line. Some times (like streaming rtp) no container format is used.
> 
> Sigmund
> >
> >
> > thanks
> >
> >
> >
> > On 6/14/05, list at scttransport.dk <list at scttransport.dk> wrote:
> > >
> > > A codec is normally considered either for audio or video. Mpeg, avi, 
> mov
> > > etc are not codecs, they are containers (which contains stuff that 
> have been
> > > encoded with a codec)
> > >
> > > Codecs are divx, xvid, mp3, h.264 etc. etc.
> > >
> > > It can be confusing though since some formats are normally just 
> mentioned
> > > as 1, like windows media files or quicktime files.
> > >
> > > A place I would recommend if u want to know more, is www.doom9.org<http://www.doom9.org>
> <http://www.doom9.org/>which contains a lot of info on video encoding.
> > >
> > > Cheers
> > >
> > > Jonas Larsen
> > > ------------------------------
> > >
> > > *From:* vlc-bounce at videolan.org [mailto:vlc-bounce at videolan.org] *On
> > > Behalf Of *Antoine Bardel
> > > *Sent:* 14. juni 2005 17:36
> > > *To:* vlc at videolan.org
> > > *Subject:* basic question about codec
> > >
> > > Hi all,
> > >
> > > I would like to clarify one thing about tv streaming.
> > > I'm using this command line :
> > >
> > > vlc -vvv --color --sout
> > > 
> '#transcode{vcodec=mp4v,vb=4000,venc=ffmpeg{keyint=80,hurry-up,vt=800000},scale=1,acodec=mpga,ab=128,samplerate=44100}:std{access=udp,mux=ts,pcr=100,url=
> > > 239.255.1.1 <http://239.255.1.1> <http://239.255.1.1>,sap,name="F2"}'
> > > 
> v4l:/dev/video0:size=640x380:frequency=623250:norm=secam:adev=/dev/dsp:audio=0
> > >
> > > One thing I'm not clear with is the codec stuff. I thought that in a 
> video
> > > codec, there was sound layers no ? (ex: mpeg). So why do I have to put 
> a
> > > video and an audio codec there ?
> > >
> > > I know this is a basic question, but if someone could explain it to me 
> it
> > > would help a lot !!
> > >
> > > Thanks
> > >
> 
> --
> Sigmund Augdal
> Edgar B. Schieldropsv 29-14
> N-7033 Trondheim
> Norway
> tlf: 91809129
> 
> --
> This is the vlc mailing-list, see http://www.videolan.org/vlc/
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>
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