Ubuntu – How to rotate video by 180 degrees with avconv

avconv

I'd like to rotate video (mp4) by 180 degrees, but not flip. Is it possible to do it with avconv?

Best Answer

It is possible using the transpose video filter. You cannot rotate by 180 degrees, but you can rotate by 90 degrees and chain the filter.

avconv -i video.mp4 -vf transpose=1,transpose=1 out.mkv

See transpose in the avconv manpage: http://manpages.ubuntu.com/manpages/quantal/en/man1/avconv.1.html

Related Solutions

Ubuntu – How to set duration for avconv

I can reproduce this issue (trying to use avconv to convert 20 seconds of internet radio stream into a wav file). So here's a fix which worked for me: simply permute the -t and -i options!

In your case, I'm suggesting trying

ffmpeg -i GOPR0001.MP4 -t 10 cut.MP4

I'm also suggesting that someone files a bug report.

EDIT: in fact it's not a bug -- it's a feature!

https://bugzilla.libav.org/show_bug.cgi?id=399

Apparently the bug was in ffmpeg ;-) The logic is apparently that -t is an output option, so should go after the input options. Go figure.

Ubuntu – How to change the framerate of a video without reencoding

MP4Box can do it.

The command

MP4Box -add SourceMovie.mp4#video -raw 1 -new test

creates the files test and test_track1.h264. You can now create an mp4 file with whichever supported framerate you would like (30 in this example):

MP4Box -add test_track1.h264:fps=30 -new DestMovie.mp4

MP4Box is part of the gpac package, so make sure it's installed.

Best Answer

Related Solutions

Ubuntu – How to set duration for avconv

Ubuntu – How to change the framerate of a video without reencoding

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