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how to select part of old mp3 and create new one




i want to copy part of old mp3 file and create a new one
at first, i install lame, but it doesn't seem to have such ability
i try mencoder, it doesn't either
then i try qmp3cut, it says "no valid header found"
though i can play the mp3 file and it's OK

what should i do next? Thanks!