For example, the following command will rotate the given video by 90 degrees clockwise: ffmpeg -i input.mp4 -vf 'transpose1' output. Using this feature, we can easily rotate videos clockwise and counter-clockwise as well as flip them vertically and horizontally. I have asked about problems on IRC and got this far. FFmpeg has a feature called 'Transpose' that is used to rotate videos. To give a better perspective of what I'm trying to do: trying to add a video as though it was being played on a phone that is moving. FFmpeg crop example: crop the 100x100 pixels top right section of a video. To crop a section of 100x100 pixels from the top left (so the x and y are 0) of a video, use: ffmpeg -i input.mp4 -filter:v 'crop100:100:0:0' output.mp4. Some of the parameters in the above commands (such as perspective, fade) are arbitrary. FFmpeg crop example: crop a section of 100x100 from the top left of the video. I do not want it to be square, but of the dimension specified by perspective filter. The final output has flickering background in the place where the rotated video has margins.Am I adding alpha channels the right way?.In this process, I'm facing a few problems: Define fadein, fadeout, scale, overlay, perspective and rotation then output the video: ffmpeg -y -i demo.mov -i demo2.mov -filter_complex " fade=in:10:1:alpha=1, fade=out:500:1:alpha=1, scale=80:80, perspective=x0=0:y0=0:x1=W:y1=40, rotate=-0.1745:c=none overlay=100:100 " -map "" out.mov.
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