[mythtv] Funky 720p playback

Robert Kulagowski rkulagow at gmail.com
Wed Feb 20 17:16:40 UTC 2008


Bill Cizek wrote:
> A few weeks ago I noticed playback problems on some of ABC's 720p programs.
> 
> The symptoms are jerky playback, out of sync audio, and incorrect 
> program length
> (an hour long program will be displayed as 45 minutes in the OSD).
> 
> The frontend log shows a bunch of lines like
>      'video_output' mean = '22090.37', std. dev. = '7938.94', fps = '45.27'
>      'video_output' mean = '22820.35', std. dev. = '8543.71', fps = '43.82'
> 
> Interspersed with dozens of messages:
>       "NVP: Video is xxx frames ahead of audio."
> 
> If I watch the recorded video in mplayer I get the same audio problem and
> constant warnings like this:
> 
>      Warning! FPS changed 47.952 -> 59.940  (-11.988010) [7]   2%  5.7% 9 0
>      A:75362.5 V:75362.4 A-V:  0.021 ct:  0.189 1399/1353 45%  2%  5.6% 9 0
>      demux_mpg: 24000/1001fps progressive NTSC content detected, 
> switching framerate.
>      A:75362.5 V:75362.4 A-V:  0.045 ct:  0.191 1401/1354 44%  2%  5.6% 9 0
>      demux_mpg: 30000/1001fps NTSC content detected, switching framerate.
>      Warning! FPS changed 47.952 -> 59.940  (-11.988010) [7]   2%  5.6% 9 0
>      A:75362.8 V:75362.8 A-V: -0.004 ct:  0.195 1418/1366 44%  2%  5.4% 9 0
>      demux_mpg: 24000/1001fps progressive NTSC content detected, 
> switching framerate.
> 
> This started at the end of January using recent SVN. It's on ABC in Chicago.
> The only thing I found on the web is 
> http://forum.videohelp.com/topic344584.html ,
> which implies ABC did something to new program episodes.  Unfortunately 
> my depth of
> knowledge on this topic is quite shallow.
> 
> My questions:
> 
> Has anyone else noticed this?

Yes, I'm in Chicago, and I'm experiencing the same exact issue.  QAM 
captures using HDHR on Comcast.  Saw it with Ugly Betty and Lost.  I 
don't see it with CBS or NBC.


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