[FFmpeg-user] Change aspect ratio of MPEG-PS without re-encoding?

llarevo at gmx.net llarevo at gmx.net
Thu Aug 9 18:57:18 CEST 2012

I don't know much about ffmpeg, because I still use mainly mencoder. 

With this, you can achieve aspect ratio change with:

mencoder ${file} -fps 25 -oac copy -ovc copy -of mpeg -mpegopts
format=dvd:tsaf:vaspect=4/3 -forceidx -o ${file}.newaspect

Set vaspect according to your needs.

fps is the framrate and optional, as well as the parameters forceidx and
format=dvd:tsaf. See also the mencoder manpage.


Am Donnerstag, den 09.08.2012, 15:37 +0200 schrieb Peter B.:
> Quoting Nicolas George <nicolas.george at normalesup.org>:
> > Le tridi 23 thermidor, an CCXX, Peter B. a écrit :
> >> Could anyone please tell me if it's possible to change the aspect
> >> ratio of an MPEG *without* re-encoding it?
> >
> > The aspect ratio is not stored in the MPEG-PS format, so the information in
> > the bitstream is the only source for it. It could be changed with a
> > bitstream filter, but that is not currently implemented.
> Oh. Thanks.
> Pb
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