Video (.mpg/.avi) to iPod (.mp4) converter

[Lennart Sorensen]

On Tue, Jan 10, 2006 at 10:02:56AM -0500, William Park wrote:
> On Mon, Jan 09, 2006 at 05:23:18PM -0500, Lennart Sorensen wrote:
> > This was done with ffmpeg version cvs20060101-0.2.
> > 
> > The commands were:
> > export file=austinpowers.vob
> > ffmpeg -i $file -cropleft 4 -cropright 10 -deinterlace -vcodec xvid -s 320x240 -r 29.97 -b 384 -qmax 5 -bufsize 4096 -acodec aac -ab 96 -g 300 -pass 1 -passlogfile mpg2ipod_log -f mov $file.pass1.mov
> > ffmpeg -i $file -cropleft 4 -cropright 10 -deinterlace -vcodec xvid -s 320x240 -r 29.97 -b 384 -qmax 5 -bufsize 4096 -acodec aac -ab 96 -g 300 -pass 2 -passlogfile mpg2ipod_log -f mov $file.ipod.mov
> > rm -f $file.pass1.mov
> 
> Hi Lennart,
> 
> What's the reason for the two pass?

According to the guy that suggested to commands, it uses the first pass
as a reference for the second to generate better quality at the same
bitrate.  I suppose it lets it know when the hard high bit rate parts
are going to be and when nothing changes so it can move bits around.

Len Sorensen
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