[MPlayer-users] about film2pal telecine

[Giacomo Comes]

On Mon, Sep 25, 2006 at 10:42:48PM +0200, Nico Sabbi wrote:
> Giacomo Comes wrote:
> 
> >Hi,
> >I have been experimenting with the film2pal mpeg telecining option.
> >So far I have not found any problem with the option itself.
> >But I did have some trouble processing mpeg telecined with film2pal.
> >
> >For example, if I copy a film2pal mpeg with:
> >
> >mencoder -of mpeg -mpegopts format=dvd -ovc copy -noskip -o out.mpg in.mpg 
> >-oac copy
> >
> >the copy work but the last seconds of the movie are missing. 
> >
> do you  mean that  the video is missing or that it's simply advanced ?
> 
> >To be more precise, if 
> >T is the duration of in.mpg, the duration of out.mpg is about T*24/25.
> > 
> >
> it's to be expected: telecining is about changing the playback speed
> without adding (or removing) physical frames

But in this case the movie is shorter because it is truncated.
Not because it was encoded or copied at different speed.

> 
> >Experimenting, I have found that if I use the following command:
> >
> >mencoder -of mpeg -mpegopts format=dvd -ovc copy -noskip -o out.mpg in.mpg 
> >-ofps 24000/1001 -mc 0 -oac copy
> >
> >then the copy is perfect.
> >So if I know in advance that the mpeg is film2pal telecined, I can use the 
> >correct
> >options for a perfect copy.
> >The problem, so far, is that I have found no way to detect a film2pal
> >telecined movie. With the classic NTSC telecined movie mplayer shows the 
> >message:
> >
> >demux_mpg: 24000/1001fps progressive NTSC content detected, switching 
> >framerate.
> >
> >that can be used to identify NTSC telecined mpegs.
> >But no such message is displayed for film2pal mpegs. Is there any way to 
> >identify
> >a film2pal telecined mpeg? It would be enough if mplayer showed the 
> >switching framerate message also for the film2pal mpegs.
> >
> >Giacomo
> > 
> it's not possible, because film2pal doesn't use the classical 3:2 
> pulldown pattern
> that mplayer can recognize (and appropriate the code is not so easy)

Then there is no way (even with some other tool) to identify a
film2pal movie?

Giacomo