Originally Posted by aldostools
This bug is already known as Showtime Bug #662:
I have found this issue many months ago, and seems there will not be a fix in the short term (look andoma's message #10).
In the link above, there are reports that converting the MP4/M4V to MKV works using MKVToolNix. The conversion takes only 2-3 minutes or less. I have tested with a couple of MP4 and they worked after the converstion to MKV.
The movies that I get black screen with audio on mm or showtime, I just play them directly from ps3s media.