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I want to convert audio tracks of some video I have. These are mkv files, and I want to convert only the audio. The video codec is fine. I attempted to use VLC, but VLC added occasional blocking artifacts to the converted video. I am looking for free software.

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ffmpeg will let you re-encode just the audio stream. It is freeware and very flexible.

If you use Linux, it's probably in your distribution's repositories. For Windows, try the WinFF GUI. I don't know how full featured it is, but the good news is you can run the included binary directly from cmd.exe.

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yes on the ffmpeg thing...seems like i recall ffmpeg.exe being bundled in the klite codec pack if you're already used to the ffmpeg cli arguments – aking1012 Nov 26 '10 at 1:32
else Super can do the same – Sathya♦ Nov 26 '10 at 3:29
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