The Sintel movie can be a good test for this problem : 
http://www.sintel.org/wp-content/content/download.html
The Full 2048 x 872 px mp4 surround 5.1 with srt subtiles (bottom of the page) 
is just fine.

After some tests, I have found this :

- Install vdpau-va-driver, configure VLC to use GPU acceleration.
- The video with subs plays perfectly.

- Smplayer with vdpau : frames are dropped when a subtitle is drawn.

- Gnome Mplayer with vdpau : frames are dropped when a subtitle is
drawn.

This may be a Mplayer specific bug.

Can someone confirm this?

-- 
dropped frames using vdpau
https://bugs.launchpad.net/bugs/661170
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