interlaced video question for you XV experts

[Jon Smirl]

A standard TV signal requires interlaced video. How does XV maintain
sync when playing a video file? For example say I am playing an
interlaced file to TV out. How is the framebuffer set up, is there one
full screen progressive buffer that is updated at 30Hz and then
scanned out interlaced at 60Hz, or is it a half size buffer that is
updated at 60Hz? If there is an half sized buffer what happens when
playing interlaced video to a non-interlaced display?

-- 
Jon Smirl
jonsmirl at gmail.com