Advertisement
Advertisement


Rotating videos with FFmpeg


Question

I have been trying to figure out how to rotate videos with FFmpeg. I am working with iPhone videos taken in portrait mode. I know how to determine the current degrees of rotation using MediaInfo (excellent library, btw) but I'm stuck on FFmpeg now.

From what I've read, what you need to use is a vfilter option. According to what I see, it should look like this:

ffmpeg -vfilters "rotate=90" -i input.mp4 output.mp4

However, I can't get this to work. First, -vfilters doesn't exist anymore, it's now just -vf. Second, I get this error:

No such filter: 'rotate'
Error opening filters!

As far as I know, I have an all-options-on build of FFmpeg. Running ffmpeg -filters shows this:

Filters:
anull            Pass the source unchanged to the output.
aspect           Set the frame aspect ratio.
crop             Crop the input video to x:y:width:height.
fifo             Buffer input images and send them when they are requested.
format           Convert the input video to one of the specified pixel formats.
hflip            Horizontally flip the input video.
noformat         Force libavfilter not to use any of the specified pixel formats
 for the input to the next filter.
null             Pass the source unchanged to the output.
pad              Pad input image to width:height[:x:y[:color]] (default x and y:
 0, default color: black).
pixdesctest      Test pixel format definitions.
pixelaspect      Set the pixel aspect ratio.
scale            Scale the input video to width:height size and/or convert the i
mage format.
slicify          Pass the images of input video on to next video filter as multi
ple slices.
unsharp          Sharpen or blur the input video.
vflip            Flip the input video vertically.
buffer           Buffer video frames, and make them accessible to the filterchai
n.
color            Provide an uniformly colored input, syntax is: [color[:size[:ra
te]]]
nullsrc          Null video source, never return images.
nullsink         Do absolutely nothing with the input video.

Having the options for vflip and hflip are great and all, but they just won't get me where I need to go. I need to the ability to rotate videos 90 degrees at the very least. 270 degrees would be an excellent option to have as well. Where have the rotate options gone?

2015/09/01
1
430
9/1/2015 10:55:33 PM

Accepted Answer

Rotate 90 clockwise:

ffmpeg -i in.mov -vf "transpose=1" out.mov

For the transpose parameter you can pass:

0 = 90CounterCLockwise and Vertical Flip (default)
1 = 90Clockwise
2 = 90CounterClockwise
3 = 90Clockwise and Vertical Flip

Use -vf "transpose=2,transpose=2" for 180 degrees.

Make sure you use a recent ffmpeg version from here (a static build will work fine).

Note that this will re-encode the audio and video parts. You can usually copy the audio without touching it, by using -c:a copy. To change the video quality, set the bitrate (for example with -b:v 1M) or have a look at the H.264 encoding guide if you want VBR options.

A solution is also to use this convenience script.

2016/02/19
705
2/19/2016 11:52:43 AM

If you don't want to re-encode your video AND your player can handle rotation metadata you can just change the rotation in the metadata using ffmpeg:

ffmpeg -i input.m4v -metadata:s:v rotate="90" -codec copy output.m4v
2015/07/28

Have you tried transpose yet? Like (from the other answer)

 ffmpeg -i input -vf transpose=2 output

If you are using an old version, you have to update ffmpeg if you want to use the transpose feature, as it was added in October 2011.

The FFmpeg download page offers static builds that you can directly execute without having to compile them.

2016/02/19

I came across this page while searching for the same answer. It is now six months since this was originally asked and the builds have been updated many times since then. However, I wanted to add an answer for anyone else that comes across here looking for this information.

I am using Debian Squeeze and FFmpeg version from those repositories.

The MAN page for ffmpeg states the following use

ffmpeg -i inputfile.mpg -vf "transpose=1" outputfile.mpg

The key being that you are not to use a degree variable, but a predefined setting variable from the MAN page.

0=90CounterCLockwise and Vertical Flip  (default) 
1=90Clockwise 
2=90CounterClockwise 
3=90Clockwise and Vertical Flip
2013/07/02

To rotate the picture clockwise you can use the rotate filter, indicating a positive angle in radians. With 90 degrees equating with PI/2, you can do it like so:

ffmpeg -i in.mp4 -vf "rotate=PI/2" out.mp4

for counter-clockwise the angle must be negative

ffmpeg -i in.mp4 -vf "rotate=-PI/2" out.mp4

The transpose filter will work equally well for 90 degrees, but for other angles this is a faster or only choice.

2014/04/11

ffmpeg -vfilters "rotate=90" -i input.mp4 output.mp4 

won't work, even with latest source...

must change the order:

ffmpeg -i input.mp4 -vf vflip output.mp4

works fine

2011/09/16

Source: https://stackoverflow.com/questions/3937387
Licensed under: CC-BY-SA with attribution
Not affiliated with: Stack Overflow
Email: [email protected]