[MPlayer-users] Re: Re: Telecine output - needed for NTSC DVD encoding
D Richard Felker III
dalias at aerifal.cx
Tue Mar 9 06:13:06 CET 2004
On Mon, Mar 08, 2004 at 06:34:43PM -0000, Bruno wrote:
> >
> >Tobias Diedrich wrote:
> >
> >It is not enabled unless you explicitly insert one of the ivtc filters.
> >I guess what you want is to use "-vf softpulldown" and "-lavcopts ildct".
> >
>
> Been there, done that, doesn't work.
> I've done some hard-telecine and soft-telecine analisys over the original
> and Mencoded streams.
> Used Windows tools.
>
> Mencoded (Soft Telecine test through DVD2AVI):
>
> 7 0 0 2
> 7 0 9 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
> 7 0 5B 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
> 7 0 AB 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
> 7 0 F5 2 2 2 2 2 2
>
> Original (Soft Telecine test through DVD2AVI):
>
> 7 0 0 0 1 2 3 0 1 2 3 0 1 2 3
> 7 0 EF 0 1 2 3 0 1 2 3 0 1 2 3
> 7 0 1D1 0 1 2 3 0 1 2 3 0 1 2 3
> 7 0 2B0 0 1 2 3 0 1 2 3 0 1 2 3
> 7 0 38D 0 1 2 3 0 1 2 3 0 1 2 3
>
> Soft telecine pattern in DVD2AVI is 0123 or 2301 where:
>
> 0 -> BFF (bottom field first)
> 1 -> BFF + RFF (bff + repeat first field)
> 2 -> TFF (top field first)
> 3 -> TFF + RFF (tff + repeat first field)
>
> As for hard-telecined tests I used Avisynth + Decomb with this script:
>
> Loadplugin("D:\kvcd\progs\dvd2avi\MPEG2Dec3.dll")
> Loadplugin("D:\kvcd\progs\dvd2avi\Decomb.dll")
>
> function FOrder(clip c) {
> fo= GetParity(c)? 1:0
> return fo
> }
>
> #mpeg2source("D:\kvcd\samples\ntsc\d2v\telecine1.d2v",idct=2,cpu=0)
> #mpeg2source("D:\kvcd\samples\ntsc\d2v\telecine2.d2v",idct=2,cpu=0)
> #mpeg2source("D:\kvcd\samples\ntsc\d2v\telecine1_old.d2v",idct=2,cpu=0)
> mpeg2source("D:\kvcd\samples\ntsc\d2v\telecine2_old.d2v",idct=2,cpu=0)
>
> Telecide(order=FOrder(),guide=1,show=true)
>
> Whenever Decomb found a pattern (not flag based) it showed an in-pattern
> message.
> It only happened with the original streams, never with the mencoded ones.
>
> An even stranger thing, as seen in the example above, is that a BFF stream
> becomes a TFF stream after the encoding when using softpulldown. That's
> why it looks interlaced all the time instead of the "3 progressive, 2
> interlaced" pattern.
>
> But then I tried a script just containing:
>
> SeparateFields()
> trim(1,0)
> Weave()
>
> This cuts the first field from the first frame. The output looked
> completely progressive, no trace of a telecined pattern.
>
>
> Conclusion: the only thing softpulldown does is cutting the first field of
> the first frame and then all looks interlaced and field order gets
> reversed. And the telecine pattern is completely gone, if it wasn't for
> that first field cutting it would be completely progressive. And that's
> not what's expected.
Sounds like you didn't use it right. Did you get skipped frame
messages while encoding? Are you using an old version of
mplayer/mencoder (i.e. not latest cvs) with -vc ffmpeg12 rather than
-vc mpeg12?
Rich
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