Transcoding lossy --> lossy is not a good thing, it will lead to quality loss.
m4v's usually have aac audio. What you can do, is to use ffmpeg: command-line ffmpeg -i INFILE.m4v -acodec copy -vn OUTFILE.m4a
will copy (without decode/encode) the audio stream to an m4a file.
[URL="http://www.avsforum.com/avs-vb/showthread.php?p=13939586#post13939586"]A DIY automation for ripping with the Sony XL1-B* media changer.[/URL]
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