IVTC just not working at all???

[dokworm]

I have a 29.970 video capture from Lasedisc. If i step through it, it has the 3 progressive frames followed by two interlaced frames, so I need to do an inverse telecine.

So I went into Video/Framerate and chose inverse telecine/ reconstruct from fields (manual).

If I step through the footage, the output frame is still identical to the input frame.

I also tried reconstruct from fields (adaptive). I've tried clicking the invert polarity, but it also seems to have absolutely no effect.
I tried writing out to a file in case it was a display problem, but the output file ends up identical to the input file.

Is there something else I need to do to make the IVTC work?

[Guest]

It's effective only during output (Save AVI) and not during preview.

That's why you don't see the number of frames on the timeline go down by 1/5 when you enable it. ;)

[stephanV]

also note that IVTC only works in full processing mode :)

[dokworm]

Ahh, OK.
But unfortunately it doesn't seem to appear in the saved AVI either, even with full processing mode enabled.

Is there anything else I need to do?

[Guest]

What do you mean it doesn't show up? Is the frame rate correct in the written file? Tell us the frame rate before and after.

It's not likely to be perfect. Is that what you are saying, the result isn't perfect?

[stickboy]

It probably would be easier using AviSynth to handle the IVTC chores instead. You can preview the IVTC'd frames, and you'd have a lot more tools available (e.g. Telecide and Decimate).

If the pattern is consistent throughout the video, you could use my JDL_IVTCPattern (http://www.avisynth.org/stickboy/) AviSynth function, which is meant to behave the same as VirtualDub's manual IVTC mode.

[dokworm]

Thanks, I used avisynth (about time I learned I guess) and it works a treat.