Anthony, thanks for all the info and tips.

But, my captures will never need IVTC as they are PAL, and if I'll resize to anamorphic, it will be PAL... or, if NTSC, I'll just change the framerate from 25 to 23,976 - thought also about this eventual change to use NTSC audio soundtracks and come back to the original film framerate - almost, as film is 24fps.

About DVD resolution, if I capture at 720 then crop at 704 (also if just 2 pixels are black on the sides it doesn't matter), this is a resolution accepted by the DVD standard, and I don't need to resize in the horizontal direction... at least, avoiding the horizontal resize will result in less interpolation, and this is good.

So, following my idea:

Capture at 720x576
Crop 8 pixels per side, obtaining 704x576
Resize vertically from 576 to 768
Crop 96 pixels from top and 96 pixels from bottom

At the end, I have a 704x576 25p 16/9, ready for DVD, with only vertical resize; if I want AVCHD, I could skip step 2 and obtain at the end 720x576 25p 16/9, with 8 pixels per side, without horizontal resize, OR add horizontal resize to setp 3. The original picture, without black borders, if 2.35:1 is 326 pixels high, then after the conversion to anamorphic will be 434 pixels - PAL, of course.

...but there is a problem: I tested some 1997 SE captures - the german edition - and the picture is 342 pixels high - so not 2.35:1... then, what it is best to do? Resize at the correct ratio of 2.35:1 and obtain a picture 434 pixels high, or retain the original AR and obtain a picture 454 pixels high?

About MflowFPS: don't know this script, I'll try it. I add that, as I remember, the luma of captures of the three THX trilogies (spanish, german, french) were identical, while the chroma were different... may I could only compare luma, but the dropouts are colored, so... how to approach this task?

OK, other questions later, maybe about Huffyhuv YVY2 and Lagarigh YV12...