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I'm trying to convert an mp4 file to avi. I've tried this basic ffmpeg script: ffmpeg -i inputFile.mp4 outputFile.avi It works, but the encoded avi file is very pixelated and does not work with Quicktime Player. I've also tried using these settings (as described here: https://askubuntu.com/questions/83161/use-ffmpeg-to-transform-mp4-to-same-high-quality-avi-file) ffmpeg -i filename.mp4 -vcodec copy -acodec copy filename.avi But the problem there is that the MP4 codec is just copied into an AVI wrapper, and so the resulting video won't play in Quicktime Player or Windows Media Player.

Can anyone suggest how best to encode MP4 as AVI while still maintaining the quality and aspect ratio of the original?

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