Telecide/Decimate possible?

[J-Wo]

I am trying to encode a region 1 disc of the movie CAMP (http://www.imdb.com/title/tt0342167/) that I think has some incorrect pulldown flags in the main movie. When I load the movie into dgindex, it reports the source is interlaced. But if I step through the material without selecting forced film, I can clearly see that it is mostly 3:2 (3 progressive, 2 interlaced frames) material when checking frame-by-frame in virtualdub. Making my own avisynth script, I determined the following lines best handle this material:

AssumeTFF()
Telecide(guide=0,post=2,vthresh=70)
Decimate()

However I don't think there's any way I can tell DVD-RB to do this, is there? If I select "Deinterlace with Decomb", all it adds is fielddeinterlace(). However if I'm not mistaken this will not decimate so I will be left with duplicate frames in my movie. Also dvd-rb seems to add fielddeinterlace() to all VTS's, even though it's only the main movie I want (some of the extras are actually interlaced). Is it possible to select "Disable Interlaced" for the movie VTS, then add the three lines above into the Filter Editor?

[jdobbs]

It's possible the DVD was encoded hard-telecined. It's rare, but known. How does DVD-RB see it? You should be able to open the REBUILDER.INF file and see if each of the segments is shown with PULLDOWN=0. If that's the case, and you see what appears to be telecined frames (as you described) it may be hard telecined.

DVD-RB backs up the DVD with the same characteristics as the original. It requires that the framecount for each segment match the original. So performing the decimate() function would cause it to fail.

[J-Wo]

yup, looks like all the segments show PULLDOWN=0. What exactly does hard-telecining mean? Would it be possible for me to edit the source in a program such as PgcEdit to remove the hard-telecining, then feed it back to DVD-RB?

Anyway looks like I'm gonna have to break out one of those darned dual layer discs!

[Susana]

telecine most often is done by mean of rtt/tff flags in the mpeg stream, 23.976->29.97 is done repeating fields.

hard telecine doesn't have flags indicating which fields to repeat, those repeated fields are encoded as well. This is less efficient.

pgcedit cannot remove hard telecine material. If this is the case, you'd have to recompress by hand, using avisynth script:

mpeg2source("your_clip.d2v")
AssumeTFF()
Telecide(guide=1,post=2,vthresh=30)
Decimate()

and then encode with 3:2 pulldown.

[wmansir]

You can do a full dvd backup with the 'Big 3" method. It's much more complicated, but you can force IVTC. I had to do it to backup the first couple of seasons of Scrubs, with almost 3 hours of video doing it at 30fps interlaced looked horrible.

[J-Wo]

Interesting, I had never heard of that method but found a link to guides here: http://forum.doom9.org/showthread.php?p=479538. Is there a more up to date link you know of? Seems quite complicated but I'm up to the challenge and will give it a try! Thanks.

[wmansir]

I'm not very up to date with the Big3 tools, so I can't say how up to date that guide is. The DIF4U, BatchCCEWs, ScenAid & Numenu forum (just below this one) is dedicated to that method and will be your greatest resource since many of the tools originated here in the Doom9 forums and the authors still frequent there.