Converting question



I have a bunch of files. Some were converted with Nero Recode and play using Tversity over my PS3 just fine. They are h.264 mpeg-4 files. However, others should be the same, but they were made with DVDFab. They list as mpeg-4 files, but they cannot play on the PS3. I hear the sound but see no video. On the computer, I can view them great with Media Player Classic. I have Xilisoft Video Converter Ultimate. Could someone please tell me what I need to do (if anything can be done) to convert these files to work properly over the PS3 with Tversity?

Thanks in advance.