I've been, quite unsuccessfully, trying to convert my DVD's to PS3 MP4 format using DVDFab Platinum for a week or so now and I think I've come up with something that may be causing some issues with whether or not videos will play properly on the PS3.
As it turns out, PS3 is pretty finicky about codecs and resolutions, the latter being my biggest issue with using DVDFab. It would seem that while the codecs DVDFab uses for PS3 files are fine, the resolution options available from the list of sizes aren't. PS3 requires, I think, that both width and height be divisible by 16. When converting to PS3, especially if you crop the movie, the resolutions available don't always have sizes divisible by 16, resulting in files that have working audio, but the video won't play on the PS3. The files work fine on the PC, but not the Playstation.
Just for reference, I've also been testing the program FairUse for converting to PS3, and no matter if you crop or not, the resolutions it provides are always divisible by 16, and the files seem to always play on the PS3. It does this by either increasing or decreasing the width or hight automatically, regardless of how you crop, so that the numbers work out correctly. While FairUse is great overall, I'd still rather use DVDFab just for it's ease of use and that it actually seems to encode to .mp4 a little faster. However, without constantly tweaking the cropping of my movies to work out a usable resolution, it's ease of use takes a hit.
So, anyway, sorry for such a long post, but I thought maybe the devs would want to look into this to see if there's something that can be done about it. Otherwise, I really enjoy DVDFab.