On Mon, Feb 24, 2003 at 06:55:30PM +0530, Rishi Gangoly wrote:
> I just started to run the following command
>
> mencoder -vcd 2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=1 -oac copy -o
> disk_01.avi
>
You are not using DivX as you mentioned earlier. The ovc lavc switch tells
it to use the libavcodec which is different from the DivX codec. To use
divx, please do
-ovc divx4
> It's 52% done but it says
>
> Selected audio codec: [mp3] afm:mp3lib (mp3lib MPEG layer-2, layer-3)
> Selected video codec: [mpeg12] vfm:libmpeg2 (MPEG 1 or 2 (libmpeg2))
>
> So what does this mean?
>
> Am I going to get the same MPEG 1 file at the end of this encoding procedure?
No.
You will be getting an avi file which is the divx(or in your case, the
libavcodec) encoded version of your mpeg-1 file.
> I get to understand that mp3 has some patent issues and thus it would be
> better to use ogg vorbis. How does one select that codec to encode the file?
>
> Acording to the documentation I'm supposed to run this command after the one
> above completes
>
> mencoder -vcd 2 -ovc lavc -lavcopts vcodec=mpeg4:vpass=2 -oac copy -o
> disk_01.avi
That is because you are using two pass encoding. From the docs,
"2-pass encoding: the name comes from the fact that this method encodes
the file twice. The first encoding (dubbed pass) creates some temporary
files (*.log) with a size of few megabytes, do not delete them yet (you
can delete the AVI). In the second pass, the 2-pass output file is
created, using the bitrate data from the temporary files. The resulting
file will have much better image quality"
The last I checked, mencoder was not fully capable of encoding to mpeg-1 or
mpeg-2. Hence, it usually encoders to avi.
>
> is that true?
>
> Regards
>
> Rishi
>
> --
> _______________________________________________
>
> http://mm.ilug-bom.org.in/mailman/listinfo/linuxers
>
>
--
Bhargav Bhatt,
Department of Applied Physics and Applied Mathematics,
Columbia University.
--
http://www.bhargav.com
--
As far as the laws of mathematics refer to reality, they are not
certain; and as far as they are certain, they do not refer to reality.
--Albert Einstein
--
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