[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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