2011-01-25, 12:19
nice post.. it's always good to know which HW platforms to avoid
Ronner Wrote:I'm seriously starting to doubt whether or not this method is going to help me get rid of my "slomo"/skip/judder moments with whatever material I watch. Sometimes it runs fine for minutes and then suddenly it's showing it's ugly face and other times it's apparent pretty soon after I start a movie. It will "slomo" for a bit, and then continue to be smooth again, or it skips a frame or so.
I've tried quite a few ModeLine settings but to no avail. I'm having this on two systems, both top notch hardware to be able to play 1080p flawlessly with either vdpau or cpu only, but no matter what I do, I can not seem to get rid of the said effects and it's driving me completely nuts.
Why did I never have any problems with this on the windows platform, but on Linux this is a major pain in the ass? Is it solely due to Xorg? Or is this a combination of nvidia drivers with xorg?
Whatever it may be it's very very frustrating because I know perfect smooth playback is possible, but I simply can't seem to get it right on two very capable systems on two different TV's that have no problems doing 24p when I was using windows and xbmc.
Could this problem have anything to do with CPU Throttling? Which I sorta doubt cuz with VDPAU the cpu usage is no more than 1.5 to 3 %
kolja Wrote:Very entertaining read, but you have one fact wrong:
Usually movies on BluRay are also in 23.976fps. True 24fps on BluRay is part of the standard, but I have never seen it in reality. Use a tool like mediainfo to check which framerate your movies have.
See: http://en.wikipedia.org/wiki/BluRay#Video
simonp Wrote:It does sound like you're having a different issue. If you haven't tried disabling CPU Throttling yet I think it is probably worth a shot. I'd agree that your CPU is more than powerful enough in your situation I think it's the variation in speeds that cause these problems and not the lack of speed from being throttled back. If you want to run the CPU at a lower speed then force it to the speed you want and don't allow the system to change it automatically.
IIRC SD video should be running at 29.97p (59.97i? please correct me here someone) rather than 23.976? If you've got the adjust refresh rate to match video setting on this would cause you to be using a different xorg modeline for SD.