Upscale video advice

[MattO]

Hello all,

I need some AVISynth advice.

I have a Nisis DVcam which captures at 320x240 10fps (not great I know ;)

I want to put this onto DVD, so I need to convert this up to 720x576, 25fps. My standalone only supports FullDVD. I don't mind if I have to add large borders.
Does anyone know of any tricks to convert it to 25fps with smooth(ish) motion? Script posts would be great ;)

thanks for any help.

MattO

[scharfis_brain]

25fps motion cannot be reached with avisynth.
use dynalpel's motionperfect for this purpose.

since your resolution is very small, yue can use half-D1-resolution (352x576) on DVD (also DVD Standard!)
your script may look like this:

Full Screen
xxxsource("yoursmallvideohere.xxx")
changefps(25)
lanczosresize(352,576)

TV-Overscan (resizes only in vertical direction and leaves horizontal direction untouched. this delivers better quality and speed)
xxxsource("yoursmallvideohere.xxx")
changefps(25)
lanczosresize(320,528).addborders(16,24,16,24)

[scmccarthy]

I like your half resolution and overscan ideas. Does digital TV still have overscan?

Stephen

[scharfis_brain]

Does digital TV still have overscan?
Sure!
only the way the signal is transmitted is digital.
The display itself is the commonly used analogue TV.
And even this TV has the well-known overscan.
Different would be a digital display device like LCD, beamer or plasma. Those devices have no or a very small Oversacn Area.


btw. my 2nd script introduces a very large Overscan-Border. It could be visible on TV...

[scmccarthy]

No, I meant 'Is there any for a digital TV or does overscan only apply to analog television?'. Soon HDTV will take over and analog will be dead. I realize resizing in the vertical direction only was for retaining a better picture quality even it the border is visible.

Stephen

[scharfis_brain]

Overscan only applys to the display device. Nothing else.

The video is transmitted in Fullsize (without borders around it). But (at least here in Germany) DTV is broadcasted with Overscan-optimization. This means that a border around the picture gets a much lower bitrate than the rest of the picture. This avoids a black border, but gives a blocky border (that you'll never see on normal TV).

Overscan has benn "abused" for achieving a better compression.

[scmccarthy]

No offence, but I am talking about the display device (the TV), not the digital medium (the DVD). O.K.?The display itself is the commonly used analogue TV.
And even this TV has the well-known overscan.
Stephen

[scharfis_brain]

hm.. I don't know much about HDTV-Displays.
I don't know whether they have overscan, or not...

[sh0dan]

You should also try the AddGrain filter, to add a bit of noise to your upscaled video.

[mf]

Originally posted by sh0dan
You should also try the AddGrain filter, to add a bit of noise to your upscaled video.
Or unsmooth, to preserve more detail.

[scmccarthy]

@scharfis_brain

Yes, that is what I was thinking. HDTV does not need overscan, but for compatibility, because many DVDs do not have a picture that goes all the way to the edges, might it display all the way to the edge or not?

@sh0dan&mf

I am not sure why you suggested using AddGrain, but with analog vs. digital on my brain, another difference between the two is that analog is not supposed to handle sharp edges well. DVDs with black borders on the side usually transition into the picture over two ir three columns.

But I suppose you meant that AddGrain can disguise resizing artifacts.

Stephen

[mf]

Originally posted by scmccarthy
But I suppose you meant that AddGrain can disguise resizing artifacts.

Stephen
It disguises the blurriness yes.

[DonBerg]

All consumer TVs (analog or HDTV) are typically set for 5-10% overscan at the factory. If you can access the set's service menu you can sometimes reduce the overscan significantly. It doesn't matter if its an analog or digital signal.

[scmccarthy]

Thanks Don,

I had a feeling that even though it is longer nessesary, HDTV would have overscan just for compatibility.

Stephen

[ADLANCAS]

Hi,

I have nearly the same situation as @MattO,
320x240 10fps
I want also to create a DVD (NTSC) and thought using:
Avisource("movie.avi")
ConvertFPS(29.97)
LanczosResize(352,480)
, which produces also DVD Standard.

Result is not so good.
I've just found Dynapel, but is there another possibility to create smooth motion ?

Suggestions are always welcome.
Thanks,

Alexandre