[mythtv-users] Very slight jitter on high power machine
doug at ties.org
Tue Dec 14 12:46:55 UTC 2004
Joe Barnhart wrote:
> --- Brad Templeton <brad+myth at templetons.com> wrote:
>>By jitter I refer to what appear to be dropped
>>frames, slight skips in
>>smooth motion during periods of high motion. Not
>>the "Sound is freaking
>>out" constant jitter or actual slow playback.
> I've noticed this too, and I describe it almost as
> "cogging" because the hiccup is very regular. For
> example when a camera pans across a scene I see smooth
> panning interrupted by regular jerks.
You might also check that your video refresh rate is very close to 59.94
(60 * 1000/1001) Hz (for US). If it's not, Myth will have to
periodically extend or skip a frame to keep in sync.
If you're not running AC3 passthrough, you can instead try turning on
"use video as timebase," which will warp the audio instead of the video.
I am not sure if this was changed to use the new libmythsoundtouch
stuff, or if it still audibly speeds up/slows down the audio.
One other thing to check... are some shows 29.97 / 59.94 Hz and some
shows 30/60 Hz? I've read that networks plan to transition to 30/60 Hz
once the analog NTSC stations are off the air; maybe some shows are
being produced that way now? If so, Myth needs a way to select a video
mode with the proper refresh rate added to its capability to pick one
with the proper resolution.
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