Yes there are corrupt files out there filled with silence. More about that in a moment. Just as a last check, if you want to, is to download QCD which will play all audio formats (built-in codecs) & is free. Get it here: 
http://www.quinnware.com/ 
As far as corrupt files go, see: 
T3 Spammers & corrupt files  & make a note about file size V's bit-rate (quality)!!! 
A couple of people have suggested fixes to those so called corrupt files. There's apparently at least 2 utility apps out there that can fix many. I don't know about all. See these: 1. 
video-fixer  (fixes mp3's also) & 2. 
MP3RepairTool  
Tell us how well they work!? 
 
  
 