Existe uma solução para este problema, você pode encontrá-lo em este link :
After several failed VLC conversions resulting in warped and/or
static-y mp3 files and a bit of tinkering, I was able to create mp3
files that actually played. Here's how you do it:
Go to Preferences (Under Tools menu) and find the Audio menu. Under
'Output', switch the type from Default (or whatever it's set to) to
File Audio Output. Set the destination, file name and extension - I
used .mp3 (this won't be your finished file -it still reads as flac,
even though the extension says its not-, so don't worry too much about
the title). When you're done with this click Save.
Under Media, click Open File and choose the flac file you want to
convert (I'm not sure if you can use this method for playlists or
entire folders yet, creating one big file, but it might be worth
trying -although casual observation implies that it probably wouldn't
work), and then click Play. Unfortunately, I know of no workaround for
the fact that you have to wait while the file plays. (By the way, you
shouldn't hear anything while the file plays, it's output is not
supposed to be audio, instead, it's writing to a new file. If the file
plays as normal, then you haven't done step 1 correctly.)
When your file is finished playing, go back to Preferences and
change the output back to default (this is very important!). If you
don't do this, then as soon as you open the new file it will overwrite
itself.
Go back to Media and select Convert/Save (or key combination
Ctrl+R). Find the file you've just created (the output file with the
proper extension, that is) and click Convert. Near the top check off
the box next to 'File' and then give it a filename and a destination,
along with your desired extension - make sure this corresponds with
the extension under Profile. Then click Save. The resulting file? A
real mp3!
Yes, it's clumsy, but as far as I'm concerned, it beats downloading
new software. And it's a heck of a find. I didn't think VLC could pull
off this conversion!