[FFmpeg-user] Rotating an mp4 video on Windows

[Peter White]

Peter White wrote:
> Elie Grouchko wrote:
>> I have been trying to rotate an mp4 video file on Windows, without
>> affecting the quality, encoding, etc. ...
>
> I believe that is not possible. At least I cannot think of a way of
> doing it without re-encoding.

Huh, apparently it is possible to do this losslessly. Metadata is the
key:

$ ffmpeg -i input.mp4 -c copy -metadata:s:v rotate=270 target.mp4

But this obviously needs to be respected by the playback application, so
YMMV. VLC does work with this.


Best,
Peter