[FFmpeg-user] Rotating an mp4 video on Windows
peter.white at posteo.net
Mon Aug 8 11:34:04 EEST 2016
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.
> ... but the output file is not compatible with WMP.
Yikes! That program from the firm that invented "incompatibilities" to
bind and oppress their customers?!
Maybe give some alternatives a go, generally, like VLC, MPC-HC etc.
I think to remember that at least one of these programs supports
rotating at playback time by means of filters/effects.
> The command I have been using:
> ffmpeg -i source.mp4 -vf "transpose=2" target.mp4
More output would have been nice. But I don't need it to tell you that
this command does affect quality. -vf implies re-encoding, hence
quality loss, unless one uses a lossless codec for the target which
this command does not. And lossless video is rather huge.
But for completeness' sake, a command that rotates and compresses the
$ ffmpeg -i input.mp4 -vf "transpose=2" -c:v libx264 -crf 0 target.mp4
Just don't come crying about the size of target.mp4. ;)
I think applying filters at playback is the better option. You might
even be able to save a batch file that starts playback with the
filter/effect applied to make it more transparent and less of a
> I tried all the options I have been able to find online, but nothing
If you have done so, why not tell us what you have already tried? ;)
Makes things a whole lot easier.
And just out of pure curiosity and spite I would like to know what
that unholy WMP complains about. :P
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