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How do you have ffmpeg copy all existing settings except the crop dimensions of a video file?

I've been struggling to crop an .mov with alpha channel (transparent video), so that it can be opened using Quicktime (instead of VLC). However, it seems that the output is either black background or somethig Quicktime cannot open. I've tried these variations and a number of others to no avail...

ffmpeg -i input.mov -vf "crop=1080:1080:420:0" -pix_fmt yuv420p output2.mov

ffmpeg -i input.mov -vf "crop=1080:1080:420:0" -pix_fmt yuva420p output2.mov

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  • Paste the readout of ffmpeg -i input.mov – Gyan Nov 26 '20 at 13:32
  • It does say this - but which other format can i choose that quicktime can open with alpha channel? Incompatible pixel format 'yuva420p' for codec 'libx264', auto-selecting format 'yuv420p' – ina Nov 28 '20 at 22:17

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