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I took video with my Sony Cyber shot holding the camera sideways to get a taller capture. I didn't realize that the video would playback sideways. Does anyone know of a app. to rotate the video?

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According to this article, most video editing software includes this option, including Windows Movie Maker. It also mentions that for custom angles (i.e. besides 90 or 180 degrees), VirtualDub can do the trick.

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MovieMaker steps --> microsoft.com/windows/windowsmedia/knowledgecenter/mediaadvice/… – ukanth Sep 12 '09 at 3:43
    
+1 for adding specific steps, thanks! – tnorthcutt Sep 12 '09 at 3:52

With a recent version of ffmpeg, you can do this from the command line, utilising the transpose filter:

ffmpeg -i input.mp4 -filter:v 'transpose=1' -c:a copy -c:v libx264 output.mp4

This will rotate the video 90 degrees clockwise; use 'transpose=2' to rotate it 90 degrees anti-clockwise. This will require re-encoding the video, for fine-tuning the quality of the results, see here.

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