decomb and blended frames

[primitive]

Greetings all. I have a video clip that was originally 24fps material, combed to 30fps, decombed to 24fps (blending frames), then recombed to 30fps for the DVD. The frames that I have decombed have the following pattern:


Legend: G = good frame, B = blended frame, ^ = these frames are pretty much duplicates

GGGBBGGGBBGGGBBGGGBB...
^^ ^^ ^^


Here's the problem: I know this was originally 24fps material, so I want to Decimate() it. However, Decimate is set up to delete the frame most similar to the one preceding it. That means that what happens in this clip is that the good (full) frame is discarded and that the bad (blended) frame is kept.

Does anyone know of a tool/technique for decimation that will in this case discard the bad frame instead of the good?

[Guest]

Use selectevery() and manually set the phase each time it changes.

[Mug Funky]

i've had some success with DGbob, unblend and decimate(2). don't ask me how, but it seems to keep the good frames. for ntsc you'll have to run a decimate(5) after that, though. and DGbob settings can be a bit of a knack.

[primitive]

Ok, now this is getting quite strange. I've taken a longer look at the pattern of blended frames and this is what I have:

7,11,22,26,37,41,52,56,67,71, etc

Which is:

+4, +11, +4, +11, +4, +11, +4, +11, etc.

What the hell kind of manipulation could have produced this pattern of blended frames?? It doesn't fit the pattern of any decombing technique I've ever heard of...

[Guest]

It appears to be the "beat frequency" resulting from your animation frame movement rate (not every frame is a new picture) combined with the periodic blending pattern used to change the frame rate.

[APF_Gandalf]

Originally posted by primitive
I know this was originally 24fps material, so I want to Decimate() it. However, Decimate is set up to delete the frame most similar to the one preceding it. That means that what happens in this clip is that the good (full) frame is discarded and that the bad (blended) frame is kept.

Does anyone know of a tool/technique for decimation that will in this case discard the bad frame instead of the good? [/B]

maybe reversing the clip in avisynth before telecide and decimate will do it, and then reverse it again after decimation.
I'll try it on some badly blended animes.