[MPlayer-dev-eng] How to calculate pts with pulldown/telecine ?

[Nico Sabbi]

Hi,
I have a serious desync problem when muxing (with my new mpeg muxer) 
switching framerate
content (VanHelsing in incoming) that mplayer reports with:


A:40672,9 V:40673,0 A-V: -0,121 ct: -1,525  31/ 28 194% 10%  3,4% 2 0
demux_mpg: 24fps progressive NTSC content detected, switching framerate.
A:40682,0 V:40682,0 A-V:  0,035 ct: -1,605 247/244 93% 10%  2,0% 2 0
demux_mpg: 30fps NTSC content detected, switching framerate.
Warning! FPS changed 23,976 -> 29,970  (-5,994000) [4]  0%  2,0% 2 0
A:40684,5 V:40684,5 A-V:  0,004 ct: -1,545 324/318 91%  9%  2,2% 25 0
demux_mpg: 24fps progressive NTSC content detected, switching framerate.
A:40687,4 V:40687,4 A-V:  0,035 ct: -1,511 395/388 90%  9%  2,2% 39 0
demux_mpg: 30fps NTSC content detected, switching framerate.
Warning! FPS changed 23,976 -> 29,970  (-5,994000) [4]  9%  2,2% 39 0
A:40688,9 V:40688,9 A-V:  0,000 ct: -1,460 441/429 90%  9%  2,1% 53 0
demux_mpg: 24fps progressive NTSC content detected, switching framerate.
[radeon] Restored overlay colorkey settings464/451 87%  9%  2,1% 55 0

(5 times in 10 seconds). The video sequence header in the video stream 
is always set
at 29.97 fps.

At the moment for every frame "n" I store the fps reported by mencoder 
(in this case
either 23.976 or 29.97) and in the demuxer I set the pts of frame "n+1" as

duration(n) = 1/fps(n)
pts(n+1) = pts(n)+duration(n)

but in this case I see that audio and video get quickly out of sync.


What's the right way to proceed? At the moment this is the last big 
problem of the muxer.

Thanks,
    Nico