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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 acces