[linux-dvb] Re: problems with a/v sync from a vdr recording [NTSC]

[Chris Chatfield <C.Chatfield@Teamphone.com>]

> Starting playback...
> A:27974.4 V:27974.4 A-V: -0.021 ct: -0.152  166/163   0% 16%  
> 0.7% 0 0 0%%
> demux_mpg: 24fps progressive NTSC content detected, switching 
> framerate.
> A:27974.8 V:27974.7 A-V:  0.034 ct: -0.132  174/171   0% 15%  
> 0.7% 0 0 0%
> demux_mpg: 30fps NTSC content detected, switching framerate.
> Warning! FPS changed 23.976 -> 29.970  (-5.994000) [4]   15%  
> 0.7% 0 0 0%

When I see something switching from 24fps to 30fps and back again, that
immediately suggests 3:2 pulldown of NTSC video.

http://www.zerocut.com/tech/pulldown.html

In short, the video player is detecting the 30fps content originally came
from a 24fps film source, and is reconstructing and playing the 24fps
source. This generally produces a better looking video.

For your original problem of losing audio-sync at that point, perhaps there
is an option to turn off this pulldown, and force it to stay at 30fps.

Chris


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