I'm trying to do flac to mp3 conversion on my QNAP TS-209 and cannot for the life of me get VBR to work. The problem is not with flac, since "flac -d file.flac" produces a good wav copy. Then, when trying wav to mp3 conversion, "lame -b 320 file.wav" works out nicely but "lame -V 0 file.wav" does not work. It gives a file that is way too small and that produces no audible output. The lame histogram shows encoding to only 32 kbit/s. I have tried the -x option but it makes no difference.
I installed lame by adding debian-multimedia.org to my apt sources.list.
Investigation of this bug is at http://forum.qnap.com/viewtopic.php?f=147&t=12356&p=57594
If you do not have access to a TS-209 I'll be glad to assist. Contact me at email@example.com.