[mythtv-users] Interlaced playback problems

Chris Weiland hobbiticus at gmail.com
Sat Aug 25 21:56:02 UTC 2007

I have 2 problems:

1) When I play some programs, interlace detection will flip on and off
frequently, as often as once every 2-5 frames.  If I run the frontend with
playback verbosity, it keeps alternating that it is detecting short strings
of interlaced/progressive frames.  This is easily fixable by setting the
video scan to interlaced as opposed to "detect", but it's still annoying to
do it since it's happening so often.  Could this be a problem with the
stream?  It only seems to happen on recordings from my cable box that is
connected via firewire.

2) Bob deinterlacing is not quite working.  It's like the picture is jumping
up and down by a pixel or two on each frame.  It is very noticeable in HD
and even more so in SD.  I also get a lot of these lines when running with
playback verbosity (on the order of one per second):
NVP: Video is 3.0885 frames behind audio (too slow), dropping frame to catch

I also get:
'video_output' mean = '33251.45', std. dev. = '13619.02', fps = '30.06'

Also, my CPU is not maxed out - it jumps around between 40-60%.  This
happens when I set the video scan to detect or force it to interlaced.

I'm running mythtv 20.2, checked out from svn just last night, but this
problem has been around since I installed mythtv on a dedicated machine - I
was able to use bob deinterlacing perfectly when I was trying it out.

Any suggestions?
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