Comment 6 for bug 504645

I was having the same problem, sometimes brasero was fine with flac, other times it would throw an error about "is not suitable for audio or video media".

A work-around that fixed the problem for me - convert the file using "Sound Converter". I just 'converted' the files from .flac to .flac in a different directory and it fixed the problem. Something odd, though, is the file sizes are *slightly* different, but whatever. As long as it works now...