Hi all,
I'm having a problem with my 720p OTA channels after upgrading my video card from a FX 5200 to a 6200. Here's what's going on:

My complete hardware configuration is in my signature below. After installing the 6200, I am running MythTV in my monitor's native resolution, 1080p, with a modeline from the monitor's EDID. The monitor is a Westinghouse LVM-37w1. Watching 1080i OTA channels is no problem (CBS, NBC, PBS) and they look great. However, whenever I change channels from a 1080i channel (or select "Watch TV" from the MythTV main menu) and land on a 720p OTA broadcast (FOX, ABC) the video is not quite smooth and it jerks slightly (kind of like a strobe effect, but not as severe) and the sound is out of sync. I can resolve the problem by changing from the 720p station to another 720p station and the video becomes smooth and audio syncs up again. When watching the 720p station, either the first one with the slight jerkiness or the second smooth picture, top reports a very high load between 2.9 and 3.5. CPU usage is at about 75% with mythfrontend and XFree86 gobbling up a large bulk of the power. I am not commercial flagging on the fly, nor is the box doing any extra transcoding, commercial flagging or recording with another input. I am using the libmpeg2 decoder and I am not deinterlacing my OTA content. OpenGL is NOT selected and I've tried with OpenGL as well as Standard and XvMC decoding, but without any success. My DISH Network/PVR-150 card reports much more normal diagnostic results for SDTV. Top reports a load around 1.0 and CPU usage is 15-20%. I have set my DISH source to use kernel deinterlacing with the help of Marc Aronson's bash script. I really only stole the mysql commands from that script to add kernel deinterlacing to my DISH source. I verified it by inspecting the channel table with webmin. DMA is enabled on my IDE hard drives, following the instructions on the wiki for that.

This is my Monitor, Device and Screen sections from my XFree86Config-4


My XFree86.0.log showing my mode is validated:


Any ideas as to what may be causing the strobe/jerkiness upon tuning a 720p broadcast?

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Mike
My Hardware Profile

Just a little update on things... First, I realized that I never said why I went from a FX5200 to a 6200. Well, I could not get 1080i or 1080p (monitor's native resolution) to work over DVI on my FX5200 card. I know some have reported they can, but I just could not get it done.

I tried re-installing the 8762 nvidia drivers as well as rolling back the drivers as far as I could with a 6200 (7xxx series nvidia driver I believe) with no luck. I adjusted the AGP settings in my mobo's BIOS, opening the aperture (?) from 64MB to 128MB without success. I tried different modelines (1080p, 1080i and 720p) without success. I think I may very well just do a good backup of my files/settings and then perform an auto upgrade to wipe the root partition. Maybe there's something that got corrupted after I changed the card out... I dunno. I'm apparently not smart enough to figure it out!

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Mike
My Hardware Profile