[MEncoder-users] rotate an MP4 by 90 degrees

[Moritz Barsnick]

Hi,

On Thu, Dec 11, 2008 at 12:53:52 +0000, Stroller wrote:
> On 11 Dec 2008, at 12:14, Daniel Kirsten wrote:
> > what is the best solution to rotate an MP4 by 90 degrees
> > (without loss of quality)?    I know gmplayer can rotate the
> > MP4,  but  I want to have a rotated file.
> VIDEO FILTERS
>         Video  filters allow you to modify the video stream and its properties.

I think Daniel was looking for a way to transpose / rotate MPEG4
losslessly. It can be done algorithmically for JPEGs, I personally
don't know about MPEG(4). That's transposing by calculation instead of
re-encoding (if I can put it that way).

I assume mencoder always decodes and re-encodes (except for -ovc copy),
and therefore cannot fulfil this. Correct me if I'm wrong.

Moritz