Slow motion

[jinqui242]

Macbook 2 GHz
VLC 0.8.6c
2 GB RAM
Hooked up to Samsung LCD HDTV LNT-4665F as extended desktop

Something I've noticed recently in playing back a variety of media files (XVID, MKV, DVD, TS) is VLC looking like it's going into slow motion for a couple of seconds, then re-motioning itself back into normal speed. I tried checking the "Drop late frames" and also "Skip frames," but it still happens randomly.

I think I've noticed it more since I started running video on the Samsung as an extended desktop. I don't seem to remember it happening when I would use the "mirror desktop" option. I'm not running anything in the background and the Internet is off. The preferences are mostly at default.

Any idea what's going on?