I can play one file fine. all have been encoded with same settings on Handbrake following Http://blackberryvids.com/Blog's guide.
with the other videos (2 other music videos, 2 full) they will either play one second then freeze (sometimes followed by the full audio, but frozen video/device, requiring a battery pull) or not play at all and just flash the play/pause and a green box in the corner saying Loading...