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

[Jeremy Hall <jhall@maoz.com>]

Hi,

I'm not sure this is pulldown, because it seems random to change 
framerate, and in some cases minutes between when it changes from 24fps.  
I have also seen 23.78 and 25 fps, as well as 26.4 on occasion.

_J

In the new year, Chris Chatfield wrote:
> > 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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