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I have an x265 video file with dual audio tracks in different languages. Obviously one is useless to me and I want to remove it without waiting through a lengthy conversion that will lead to quality loss.

I have been using mkv2mp4 to do this with x264 in the past, but it spits out an error when I try any x265 coded video. Is there a codec I can install? Any other suggestions?

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Use ffmpeg*, a free command-line tool:

ffmpeg -i input.mkv -c copy -map 0:v -map 0:a:0 singleaudio.mkv

where 0:a:0 is the index of the audio stream you wish to keep. In ffmpeg, numbering starts from zero, so 0:a:0 refers to the first audio stream in the source file. Running ffprobe input.mkv beforehand will show the contents of the input.

*download the latest snapshot/nightly build.

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