[vlc] basic question about codec

[Antoine Bardel]

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>,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
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