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When I try to concatenate one video from IOS and Another from Android user, the output video doesn't work.

I am using this command:

ffmpeg -f concat -safe 0 -i mylist.txt -c copy output
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    Please use ffprobe to include information about the format of each file in your list, if they aren't the same merging won't work (you'll need to reencode, causing loss). To make Android videos similar (but possibly still not mergable) go to phone's video settings, "Rear Video Size" and turn on "HEVC" (or turn it off on iPhone). That's probably where the problem lies as the default for each OS is opposite. – Rob Jul 12 at 15:28
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    All inputs must have the same formats and parameters. Show info for each input as Rob mentioned if you need help conforming them. – llogan Jul 12 at 17:14

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