[vlc] Re: basic question about codec

[Jonas A. Larsen]

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},sc
ale=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

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.videolan.org/pipermail/vlc/attachments/20050614/76b27870/attachment.html>