DPG (and MP4) problem

I downloaded an FLV video, then proceeded to convert it with DPGTools to DPG and Any Video Converter to MP4 (for mobile phones).
The FLV file works properly on my computer, but the DPG does not on my DS and the MP4 on my phone. The video and the audio plays properly at first, but when I fast forward or rewind, the video and audio does so at different rates. So basically the audio and video get jumbled up. I think it must've been the FLV file, but I'm not so sure.
Any help?

DPG is a crappy format. Don't expect it to convert well. You'll be lucky if the audio matches up all of the way through really, even without fast forwarding and rewinding.

What puzzles me is that it worked well before, no problems with conversion. Maybe its the converter. I'll try using others.
EDIT: Never mind, I think the problem is the source.