Re: [gentoo-user] large .avi video files, re-encode ?

[Dave S]

On Thursday 28 December 2006 17:39, Arturo 'Buanzo' Busleiman wrote:
> Dave S wrote:
> > Hi all,
> >
> > I have a bunch of .avi video files that I use in a openoffice
> > presentation, they are nice and clear but really large files (1 - 2 GB
> > each !).
> >
> > I know nothing of video files, is it possible for me to re-encode them to
> > a more efficient format without loosing quality ?
>
> I use something like this. Adapt for your usage. It takes some parameters,
> but it's mainly used for dvd ripping:
>
> #!/bin/sh
> rm frameno.avi
> echo "DVD TITLE: $1"
> echo "OUTPUTFILE: $2"
> echo "SID: $3"
> echo "AID: $4"
> echo "Is that what you want? Press enter for OK, CTRL+C to cancel."
> read k
> mencoder dvd://$1 -sid $3 -aid $4 -ovc frameno -o frameno.avi -oac mp3lame
> -lameopts mode=1:vbr=2:q=6 -af volnorm -af-adv force=0
> mencoder -oac copy -ovc xvid -xvidencopts
> bitrate=-1400000:me_quality=6:chroma_opt:vhq=0:pass=1 dvd://$1 -sid $3 -aid
> $4 -o /dev/null
> mencoder -oac copy -ovc xvid -xvidencopts
> bitrate=-1400000:me_quality=6:chroma_opt:vhq=0:pass=2 dvd://$1 -sid $3 -aid
> $4 -o $2
>
> Check out the bitrate= parameter in the last two commands. The negative
> number tells mencoder to create a 1.4gb file (that's 1400000kilobytes,
> rounded up, not exact 1.4gb).
>
> --
> Arturo "Buanzo" Busleiman - Consultor Independiente en Seguridad
> Informatica ¿No sabés a dónde ir a comer o tomar algo? Visitá
> www.vivamoslavida.com.ar LISTA DE CASAMIENTO: Cualquier Fravega a nombre de
> Busleiman (37520).


1GB file compressed to 5M (OK so there was not too much changing on the 
screen, mainly cursor & some popups) - I call that a success :)

Cheers

Dave

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