[MEncoder-users] Automating telecined/interlaced detection

[Scott Fones]

Hi all,
        
        I'm trying to write a frontend to help automate my compression.
        I was
        hoping to autodetect whether the video is telecined or
        interlaced.  In
        the mplayer documentation it suggests using the pullup filter
        with the
        verbose flag and looking for the 3:2 pattern.
        
        http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-telecine.html#menc-feat-telecine-ident-telecined
        (Last Paragraph)
        
        I'm a little confused though as to where the 3:2 is showing up
        and
        whether the pattern they talk about "0+.1.+2 and 0++1
        alternating" is
        the only acceptable telecine pattern.  If its not "0+.1.+2 and 0
        ++1",
        can I assume that its interlaced?  And, is the 3:2 coming from
        the
        duration values that are printed out with the pattern.  For
        instance,
        
        A:   2.3 V:   2.3 A-V:  0.000 ct:  0.065  56/ 53  6% 13% 19.7% 0
        0 80%
        affinity: .0+.1.+2..3+
        breaks:   |0..1..2|.3.
        duration: 3
        A:   2.4 V:   2.4 A-V:  0.001 ct:  0.066  57/ 54  6% 13% 19.6% 0
        0 79%
        affinity: .0++1..2+.3.
        breaks:   .0..1.|2..3.
        duration: 2
        
        
        Since this has duration 3 followed by duration 2, does that make
        it
        telecined?  Even though it doesn't follow the same pattern?
        
        Any input would be appreciated, I'm pretty confused here.
        
        Thanks,
        Scott