Synology (Unix) Remux all the .mkv files in a folder, stripping the metadata. for i in .mkv; do ./ffmpeg -i "$i" -c:v copy -c:a copy -map_metadata -1 "${i%.}".mp4; done Same as above, but converting the audio to AAC for i in .mkv; do ./ffmpeg -i "$i" -c:v copy -c:a aac -map_metadata -1 "${i%.}".mp4; done

Windows Remux all the .mkv files in a folder, stripping the metadata. for %i in (*.mkv) do ffmpeg -i "%i" -c:v copy -c:a copy -map_metadata -1 "%~ni.mp4" Same as above, but converting the audio to AAC for %i in (*.mkv) do ffmpeg -i "%i" -c:v copy -c:a aac -map_metadata -1 "%~ni.mp4" Same as above, but converting to 2 channels (stereo) for %i in (*.mkv) do ffmpeg -i "%i" -c:v copy -c:a aac -ac 2 -map_metadata -1 "%~ni.mp4"