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VFR (No, nothing to do with aircraft.)

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teucom:

--- Quote from: pokute on April 08, 2008, 12:00:27 am ---This is great! I think we just did a better job capturing the nuts and bolts of this issue than I have seen in any video forum!
--- End quote ---
Thanks, but this solution is pretty basic and known to everyone who doesnt use vector prediction/compensating frame rate conversion (with image rebuilding), as latest professional sophisticated (read: expensive) studio hardware does.

There are avisynth libs even trying these advanced vector prediction methods, but early staged, currently working with 1-2 frames per second rendering on a 3+GHz machine, and suffering from heavy image distortions when used on animated sources with duped frames. The prof studio hardware converters naturally come as black boxes, heavily secured against backward engineering. The algorythms are well protected company secrets...

And remember, the simple method works only for us "lucky" 25fps PAL people due to the 1fps difference 24>25fps, you cannot use that for NTSC 30fps reconversion unless theMIXED fps source is MOSTLY 30fps, which hardly never occurs... This is why 24/25->30fps conversion has to use such ugly solutions as interlaced telecine or blurry frame blending on progressive sources, at least until now.

The reason why Home Cinema dedicated LCD/Plasma Flat TVs offer a true 24fps mode is to completely avoid that 30fps NTSC legacy and its difficult and quality lowering FILM workarounds... in PAL countries FILM conversion is easily done just with the mentioned slight speedup, and noone would notice the difference between 24/25fps.

pokute:
That may be. But if you get most of your dvd's from China and India, you have a lot of material that did not benefit from this sophisticated hardware. With these dvd's I am happy to settle for simple linear blending, combined with the progressive mode of my TV, which at least makes them watchable.

Since the problem that I was trying to solve requires only the detection of small chunks of "proper" (not pathological) hard-telecine content, which the Transcode 32detect filter can do, I think I will be able to do what I want to do, which is to properly decimate small sections of 30fps content in 24fps content, without accidentally dropping a keyframe. Mencoder, btw, does not seem to offer a filter that can detect hard-telecine reliably.

bastard-sama:
so what is this aircraft about?

pokute:

--- Quote from: bastard-sama on April 09, 2008, 09:08:25 am ---so what is this aircraft about?

--- End quote ---

Eh?  ???

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