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

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I found with both existing answers that theywork with the MP4 files from a Hero 3 camera, but only after I added -c:a copy to the command (just before the output filename). I also found that the second version was indistinguishable quality, but about 50% faster than the chained translate version. – Simon Dec 30 '13 at 15:48
up vote 29 down vote accepted

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

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That's exactly what I needed - thank you. – sobi Mar 19 '13 at 14:43
    
This rotated my video, but the quality drop (resolution and framerate) was massive (iphone .mov file). – Gringo Suave Jan 6 '14 at 21:14
    
transpose=clock works now see my answer – Elder Geek Feb 27 '17 at 17:05
up vote 13 down vote

Yes, but you'll need to add some additional options to your command for it to work properly. Transpose and vflip/hflip should do the trick, but if you don't tell avconv more detail about what you want, you'll likely get very low quality output try:

 avconv -i original.mp4 -vf "hflip,vflip" -codec:v libx264 -preset slow -crf 20 -codec:a copy flipped.mp4

Notice the -crf option. That sets the output quality. It goes from 0 (lossless) upwards logarithmically. You'll probably want a value between 19 and 25 in most cases. -preset sets the speed of the encoding, either "slow", "medium", or "fast". Slow should get you smaller file sizes with an obvious tradeoff. You should adjust -codec:v to match the original. If you don't set these options you'll get the defaults, which don't work well when flipping iphone video.

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Unrecognized option 'preset' Failed to set value 'slow' for option 'preset' That's what I got – Karel Bílek May 12 '14 at 14:16
    
...and without it, I got Unknown encoder 'libx264' – Karel Bílek May 12 '14 at 14:17
1  
apt-get install libavcodec-extra-53 solved it – Karel Bílek May 12 '14 at 14:21
up vote 6 down vote

Additional method with avconv is to use vflip and hflip filters. Should run faster and maybe better quality:

avconv -i video.mp4 -vf vflip,hflip out.mp4
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Same: This rotated my video, but the quality drop (resolution and framerate) was massive (iphone .mov file). – Gringo Suave Jan 6 '14 at 21:14
    
@GringoSuave wcarlson has given you a stripped down example, you still need to add all the -codec:v ... and other tags – v010dya Nov 10 '14 at 18:24
up vote 0 down vote

I did this:

avconv -i invertedOne.mp4 -c:a copy -vf "hflip,vflip" rightOne.mp4

Full HD video, great results with non perceivable quality loss

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up vote 0 down vote

For avconv or ffmpeg Under 14.04 or later

There have been some changes to the libav documentation since @phoibos quality answer to this question. You can rotate a video 180 degrees by chaining 2 90 degree commands together (seperated by a comma) I accomplished this with the command

avconv -i inputfile -vf transpose=clock,transpose=clock outputfile

for clockwise rotation.

in ffmpeg the syntax is the same.

ffmpeg -i inputfile -vf transpose=clock,transpose=clock outputfile

where inputfile is your supported input video file and outputfile is your desired output file.

For counter clockwise rotation replace clock with cclock

Sources:

https://libav.org/avconv.html#transpose

Testing on Ubuntu 14.04.5 LTS

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protected by Community♦ Feb 27 '17 at 16:31

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