Convert mp4 to mkv
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ffmpeg -i input.mp4 -codec copy output.mkv
Tip: To convert all MP4 files in the current directory, run a simple loop in terminal:
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for i in *.mp4; do
ffmpeg -i "$i" -codec copy "${i%.*}.mkv"
done
Cut using a specific time
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ffmpeg -i input.mp4 -ss 00:05:10 -to 00:15:30 -c:v copy -c:a copy output2.mp4