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I want to use Ubuntu and preferably standard packages such as ffmpeg to rotate a .3gp video file by 90 degrees in any direction. Preferably a command line or Python script.

How can I do that?

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I found that ffmpeg was able to do this. See, e.g. Ubuntu forums: rotate video 90 degrees –  Simon Dec 15 '11 at 12:26
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3 Answers

up vote 3 down vote accepted

by using VLC, you may rotate the video by going to Tools >> Preferences...

And select "All" for show settings. Then go to: Video >> Filters >> Rotate

After setting the degree you want, you can rotate by going to Tools > Effects and Filters > Video Effects > Geometry .. .

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the one I've tested is mp4 but I believe that VLC can support 3gp too. hope this helps. :)

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i can view the video rotated, but how do you make the change persist –  justinhj Jun 6 '10 at 9:14
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Avidemux should be able to do this.

Do Video->Filters->Rotate(x degrees)->Close then File->Save->Save Video

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From the command-line, with ffmpeg:

ffmpeg -i input.3gp -filter:v 'transpose=1' \
-c:a copy -c:v libx264 -preset veryfast -crf 22 \
-c:a aac -strict experimental \
output.3gp

'transpose=1' will rotate the video 90 degrees clockwise; to rotate anti-clockwise, use 'transpose=2'. See the documentation for a bit more information. For information on the video encoding settings here, see this x264 guide and the AAC encoding guide.

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