We have 300+ full length videos in mp4 all high quality .
Looks like you need to Hint the mp4 file with mp4box. It now wants to fully load the whole file before it starts.
Try our mp4's they should work trouble free, fully tested.
You can export them here
http://allsexcash.com/?tpl=promo just fill any number to log in and get to the export tool.
If you have any questions feel free to contact me