[mythtv] bobdeint: vertical jitter behaviour

[Jeroen Brosens]

I found that when using bobdeint the image sometimes starts to go 'out 
of sync' and the nice fluid motion goes into a horrible vertically 
jittering one. It manifests erratically and without apparent reason. Can 
anyone confirm this behaviour? I am using an ASUS Pundit with SiS 
integrated video, X.org 6.8.1, march=pentium4, MythTV CVS (current).

-- Jeroen