I was trying to play the following movie trailer online using VLC and it constantly freezes:
http://www.fastandfuriousmovie.net/medi ... D_720p.mov
I was using VLC 0.9.9 running on WinXP x64 behind a 100Mbit fiberLAN connection. During playback with VLC the transfer rate lies around 1 MB/s (MegaBytes per second) and then something hangs within the VLC and the transfer rate drops almost zero. I usually have no problems playing Hi-Def mediafiles on my harddrive using VLC.
On QuickTime player I can visually see how the buffer fills up during playback (I miss this feature on VLC) and the transfer rate is around 3.2 MB/s and steady until the entire movie has filled the playback buffer.
So I strongly suspect something is wrong with VLC as I rarely have managed to get trouble-free streamed playback using it.
For attempts on other movie trailers I suggest going to
http://www.comingsoon.net.