How can ffmpeg be used to change the pixelformat?

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To change the pixelformat using FFmpeg, you can use the "-pix_fmt" option followed by the desired pixelformat. For example, to change the pixelformat to "yuv420p", use the following command:

ffmpeg -i input.mp4 -pix_fmt yuv420p output.mp4

This will convert the input video to the yuv420p pixelformat and save it as the output file. You can also use other pixelformats such as "rgb24", "gray", "yuv444p", etc.