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FourCCs are Microsoft's ID tags for streams e.g. avc1 for H.264/AVC or mp4a for an AAC audio stream. The container doesn't really matter. If you want to change the FourCC, use ffmpeg like so ffmpeg -i -strict -2 -c copy -vtag ABCD where ABCD is your new 4CC/tag. You current file already shows avc1 for the video stream, which is default ...

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