a deinterlaced problem for a PAL

[jeffhuge]

Many film companies shorten the movie length by change the 24fps to 25fps.
For this DVD, a field is added to every 12 frames so every 24 frames have 2 fields.
24+1/2+1/2=25

but watching from virtualdubmod or TMPGenc, the first 13 frames are progressive and the latter 12 frames are interlaced:mad:

pattern:(12frame)
0101010101010101010101010
there is a "0" at last。。。。。。

I use a decomb
Decimate(25,0,0.0,3.0,2,"",false)
but it can just change 25fps to 24, not 23.97 which means there will be repeated frames every 800+ frames.
2497+3=2500
2500/3=833.333333

or this

doubleweave()
selectevery(25,2,4,6,8,10,12,14,16,18,20,22,24)
still not 23.97

any good ideas?

[scharfis_brain]

telecide().decimate(25) helps :)

[jeffhuge]

it still comes out 24fps

[scharfis_brain]

use assumefps(23.976,true).ssrc(audiorate(last)) afterwards

or use a decimator like TDecimate, that is able to decimate arbitrary ratios.

but why are you so sure, that the original framerate was 23.976 and not just 24?

[Niddhogg]

In other words, why would you want to use 23.976 in first place?
Theatres (film format) uses 24 (display at 48 by duplicate).
29.970 I can understand, but 23.976 is a completely arbitrary framerate.

[jeffhuge]

because after I deinterlaced the film by my ways(output 24),I find there are still repeated frames.
So I think the original is 23.97...

[neuron2]

Try FDecimate(23.976).