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If you are using a more advanced tool like the , you can "remux" the video instead of fully re-encoding it. This changes the .mkv container to .mp4 instantly without losing quality or wasting battery.
Capability to convert multiple MKV files at once. mkv to mp4 converter apk download
ffmpeg -i input.mkv -c:a copy -c:v copy output.mp4 If you are using a more advanced tool