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Old 25th March 2009, 14:08   #1  |  Link
JeanMarc
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Join Date: Aug 2006
Location: USA
Posts: 58
DGIndex pulldown detection issue

First, thanks to the contributors to this forum -- a huge source of valuable information for me.

I am posting this after spending some time researching this and other forums. I am sure there is an obvious setting I am missing somewhere, but I can't find it -- I am still a newbie trying to understand the technology.

I am trying to use DGIndex Parse D2V tool to detect the frames with the pulldown pattern.
The clip I am using (from a movie captured from NTSC cable) is using that pattern, which I can see very clearly when stepping through it with VirtualDub. But DGIndex fails to show the * indicating 3:2 pattern.
More details:
  • I am using DGIndex 1.5.0
  • I used DGIndex to generate a d2v file from my mpeg2 capture.
My script (to observe the pattern) has one line:
Code:
MPEG2Source("D:\clip.d2v")
The parse output looks like this:
Code:
D2V Parse Output

Encoded Frame: Display Frames....Flags Byte (* means in 3:2 pattern)
--------------------------------------------------------------------

[Field Operation None, using flags]
[GOP: closed]
[Clip is TFF]
0 [I]: 0,0......................2
1 [B]: 1,1......................2
2 [B]: 2,2......................2
3 [P]: 3,3......................2
4 [B]: 4,4......................2
5 [B]: 5,5......................2
6 [P]: 6,6......................2
7 [B]: 7,7......................2
8 [B]: 8,8......................2
9 [P]: 9,9......................2
10 [B]: 10,10...................2
11 [B]: 11,11...................2
12 [P]: 12,12...................2
[GOP: open]
13 [B]: 13,13...................2
14 [B]: 14,14...................2
15 [I]: 15,15...................2
16 [B]: 16,16...................2
17 [B]: 17,17...................2
18 [P]: 18,18...................2
19 [B]: 19,19...................2
20 [B]: 20,20...................2
21 [P]: 21,21...................2
22 [B]: 22,22...................2
23 [B]: 23,23...................2
24 [P]: 24,24...................2
25 [B]: 25,25...................2
26 [B]: 26,26...................2
27 [P]: 27,27...................2
[GOP: open]
etc...
I don't have a problem with that clip which has a very consistent 3:2 pattern, but I want to make this work to help IVTC other material with somwhat irregular patterns, and the DGIndex parsing tool would then be very useful.
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Old 25th March 2009, 15:24   #2  |  Link
Guest
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The Parse D2V tool can work only with soft pulldown (TFF/RFF flags in the MPEG2 stream). You have hard pulldown, i.e., the fields are not flagged but physically duplicated.
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Old 25th March 2009, 15:39   #3  |  Link
JeanMarc
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That explains it. Thanks for the reply.
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