The-Lion said:
I now have another problem, I mux my h264 files into a MP4 container so I can import them into Sony Vegas. One file plays fine in Media Player Classic (with K-Lite codec pack) but stays black in Sony Vegas, though it displays one thumbnail.
Try remuxing with MP4Box. You could also convert the problematic file to lagarith with Virtualdub, which is probably the better option.