[mythtv-users] HTDV 1080i source at 1080i DVI - Interlace field order backwards on GeForce 6200

[Paul Robertson]

Recently upgraded to 6200 nvidia GeForce adapter, and now have a new
problem.  When displaying HTDV 1080i source at 1080i DVI resolution, it
appears the interlaced field order is incorrect.  This is indicated by the
fast back and forth jitter that I am observing for all vertical and
horizontal motion.  I do not have this problem with either GeForce FX440 or
5200.

 

I am running Nvidia 8762 driver + XvMC + OpenGL Vert Sync + No
Deinterlacing.

 

Tried tweaking all Xv and OpenGL setting in nvidia-settings, disabling
OpenGL (reverting to RTC) timing, .  These made no difference (really wasn't
expecting them too).

 

As an experiment I enabled Bob (2X framerate) deinterlacing in mythtv.  This
solved the fast back and forth jitter, but it appears this causes me to lose
motion detail.  This also begs the question, "Why would I need to
deinterlace an interlaced source for an interlaced display?"

 

It simply appears the interlace fields are not being displayed in the
correct order.  Is there a way to tell the mythtv , X or the nvidia driver
to swap the field order?

 

 

 

 

Paul Robertson - paulrobertson at swbell.net

 

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