[mythtv-users] Rectangle pixels cause jerky playback in widescreen but fine in 4:3?

[nospam312]

I use a 720x576 widescreen resolution with a rectangle pixel setup via
DisplaySize in my xorg.conf file.  The aspect ratio is set correctly
for widescreen and 4:3 recordings/Live TV.

However, my widescreen recordings are very jerky when there is any
movement.  When I watch a 4:3 recording everything appears fine.  Live
TV is the same - widescreen jerky and 4:3 is fine.

I am using the latest Mythbuntu 7.10 fixes release.

Does anyone know what could be causing this?

TIA