[vlc] Re: basic question about codec

[Antoine Bardel]

thank you

but this does not answer my question.

Why do I have to choose both a video and an audio codec ? (since video codec 
can encode sound) Are the streams separated ?

thanks

On 6/14/05, Jonas A. Larsen <jonas at vrt.dk> wrote:
> 
>  Mmm considering the field name I would think it was obvious?
> 
>  If you chose vcodec u chose a video codec. If you chose acodec u chose an 
> audio codec
> 
> Mp4v means mpeg4 video, which is a codec.
> 
>   ------------------------------
>  
> *From:* vlc-bounce at videolan.org [mailto:vlc-bounce at videolan.org] *On 
> Behalf Of *Antoine Bardel
> *Sent:* 14. juni 2005 17:59
> *To:* vlc at videolan.org
> *Subject:* [vlc] Re: basic question about codec
>  
>  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 ?
> 
> 
> 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/>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:* [vlc] 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>,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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