DV->DivX & Deinterlacing problems

[Pertwee]

Thanks SpikeSpiegel!

I pretty much understand all your advice which has been most helpful.

When you say that you lose all of field B and half the length of field A when you downsize from 720x576 to 384x288 I take it to mean that you are referring to the capture process ie. only capturing at that resolution and frame rate??? I would understand it if these capture settings gave you lousy quality. What about if you were to capture at full resolution, perform all your editing in Premier and then export the finished movie as a 384x288 25fps movie??? Is there any benefit to de-interlacing the captured file first (in VDubMod with SmartDeinterlace for example) before editing the file in Premiere and then downsizing for export???

The world of multi-media needs a ruthless dictator to enforce some sort of order to the quagmire of formats for video out there.

Kind regards

Pertwee.

[SpikeSpiegel]

Briefly: Never change resolution, use SmartDeinterlace.

If you wanna know why:
No, I assumed that you capture @ 25fps with res. 720*576 and export to DV without changing these parameters.
If you downsize resolution, IN ANY CASE (BEFORE of AFTER capturing-exporting), you will loose something:

definition (if the video is progressive or if you double the frame rate in interlaced ones)
or
definition + "fluidity" (if the video is interlaced and if you don't change the frame rate)

Halveing res. of int. video & doubling frame rate (=SeparateFields+Resize), the def. loss is half (but still great) the one that you could obtain halveing the res. of a progressive video (in this case you loose 1/2 horiz. lines, while with int. videos those lines [fieldB] are moved to the next frame)
This, combined to the fact that low resolution is good for low bitrates, explains why somebody say that "downsize is better". If you wanna fit 2hours video in a floppy disk that's the best choice (...)

[SpikeSpiegel]

Anyway the "altitude" of the two fields is different and this produces "flickers"
If you keep the same frame rate (as you wish to) you erase flickers, but definition-fluidity goes to...well I think you understood

The only way to have no loss of def. and f. is to keep the resolution and deinterlace. I don't know (and, most of all, I don't care) if there's a way to deint. the video before exporting...
Anyway only one rule is undeniable: "Empirical way is better!"
...in other words: have some tests and let me know!

Good luck!

[Pertwee]

Thank you!!

Armed with this information I shall immerse myself in the abyss and come out with something useful I am sure - I will let you now how I do.

Kind regards

Pertwee

[neuron2]

Originally posted by SpikeSpiegel
Yes, it's a VD-VDMod filter (and, most of all, a Donald Graft filter=great quality)

Hey thanks, Spike. Very kind of you to say so.

[SpikeSpiegel]

@neuron2
Is it really you?
Welcome to this forum, anyway!

Originally posted by SpikeSpiegel
Yes, it's a VD-VDMod filter (and, most of all, a Donald Graft filter=great quality

this is just an observation:
tons of really-bad-encoded anime videos passed through Smart Smoother and I ever had good results and, even if I don't handle interlaced stuff very often, when it happened, Smart Deinterlacer proved to be the best deint. filter.

[neuron2]

@neuron2
Is it really you?

I pop in when I run out of new threads to read at Doom9.

[blutach]

Great to see you neuron2. Come in more often.



Regards