24 Jul
2008
24 Jul
'08
11:31 a.m.
On Thu, Jul 24, 2008 at 09:02:50PM +1000, Torgeir Veimo wrote:
Hmm.. I still don't understand why you need to do this in the first place?
It is to avoid the output framerate drifting away from the DVB-T/S/C input framerate.
right. Normally Xserver modelines can only produce 'discrete' and 'static' video timings somewhere near 50Hz. For example 50.01Hz if you are lucky.
With the patch you can dynamically fine tune the frame rate by about 0.000030Hz steps what should be enough for our purpose:)
I actually measured this step size by a quickly hacked measurement tool (drift_monitor) which can be found here (field_sync_tools.tgz):
http://www.vdr-portal.de/board/thread.php?postid=739784#post739784