[DBMandrake]

First, here's two examples of what it looks like: (I didn't upload them to youtube as they'll probably get blocked for copyright reasons even though short clips should be "fair use"...also I didn't want youtube doing any processing or frame rate conversion on them. Download for best video quality)

What I'd really like is the source file you are playing on the Pi (ideally cut it down to a smaller size, assuming that fails) so I can investigate the stutter on my Pi.

What's the best tool to cut it down to a shorter sample ? (Mac or Windows, Mac preferred, as that's where the files are hosted and is the faster machine)

I'm not sure that an edited version of the file will show the same symptoms given the nature of the problem but I will give it a try.

Explain exactly what you do to get the stutter (e.g. play for 10 seconds, then press big step forward twice rapidly).

In the example I showed I just start playback at the beginning of the file then jump forward twice. Doesn't matter if I wait a few seconds or not, and the problem is there after the first jump too, its just there isn't much movement in that part of the movie. (Just scenery and tigers lying in the sun )

If I start playback further in then use reverse jumps to get back to (almost) the beginning then jump forward it doesn't seem to happen. It seems to be loosing synchronisation when performing certain size jumps across certain regions. If I use large jumps further into the video it rights itself again.