[MPlayer-users] ATSC 720 at 24p streams
nicola_sabbi at fastwebnet.it
Fri Mar 10 00:37:25 CET 2006
>it looks like my local ABC affiliate has started sending certain
>primetime shows as 720 at 24p with RFF, TFF and Progressive flags set
>up for soft telecine to 60p.
>mplayer and mencoder don't seem to handle this at all. the code
>for detecting telecined material appears to be written for
>29.97i->23.976p, such as is found on a DVD.
>the mpeg demuxer code itself seems to be properly calculating
>the display times for these frames; with -v -v i see 2.0 and
>3.0 alternating. however, in libmpdemux/video.c, the telecine
>detection code looks for an average display time of 1.25 and
>then converts the frame rate to 4/5 of the original.
>i'm not sure what the right way to fix this is. perhaps the
>1.25 and 4/5 should be conditional on the input frame rate?
>that is, if it is 29.97, then the code is correct as it stands,
>but if it is 59.94 then 2.5 and 2/5 should be used instead?
does it go out of sync so as it is?
I'm not entirely sure that telecining is worth reversing
(when you use -demuxer lavf mplayer doesn't do it)
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