Hi question about Resize filter (VDubMOD)

[GangstaRap]

I just wondered...
what is this filter used for?
is it really necessary?
i mean...
i tried a lot of tutorials and they're all says i should add this filter...
the thing is..
i also tryed to skip this filter and i got the same results...

Thanks in advance!

[KBeee]

You only need to use the resize filter if you want to resize your video.

[GangstaRap]

KBeee, thanks for respondin' man!

so according to what you're sayin' - its not really necessary...
correct me if i'm wrong...
cause if i have a 640x272 AVI file - what reason do i have to resize it?

[jagabo]

There could be many reasons. Maybe you want to make a very small file to post on your web site. Maybe you want to create a DV AVI file (which must have a 720x480 or 720x576 frame size). Maybe you will be frameserving to an MPEG encoder to make DVD compatible MPEG files. Maybe you need to reduce the size to fit on your portable video player. Maybe you want to correct/change the aspect ratio...

[KBeee]

KBeee, thanks for respondin' man!

so according to what you're sayin' - its not really necessary...
correct me if i'm wrong...
cause if i have a 640x272 AVI file - what reason do i have to resize it?

Yes, if you have a 640 X 272 video, and you want a 640 X 272 video, then don't use resize.
Only resize if you need to for specific reasons, as Jagabo said.
As you're using VDMod, there should be 2 resize filters, called "resize" and also "VDMod_Resize".
If you DO need to resize then the VDMod_resize filter has more options than the plain vanila "resize" filter.

[jagabo]

VDMod_resize doesn't come with VirtualDubMod. You have to download and install it.

[GangstaRap]

jagabo, thanks for postin man!
i guess i didnt explain myself well...
i know that if i want to leave it an AVI format - the resize is unnecessary.
but when i want to encode to VCD\SVCD - does it have special sizes?
what are those compatible MPEG sizes?
do i have to change this size (640x272) or any other AVI size to a compatible MPEG size?

and again - thanks for your great help guys!!!
youre helpin me alot!!!

[jagabo]

VCD: 352x240 NTSC, 352x288 PAL
SVCD: 480x480 NTSC, 480x576 PAL

See the "What is" links at the top left of every page here:

https://www.videohelp.com/vcd
https://www.videohelp.com/svcd

[GangstaRap]

VCD: 352x240 NTSC, 352x288 PAL
SVCD: 480x480 NTSC, 480x576 PAL

do i have to resize to those sizes when encoding to VCD\SVCD?
what if i wont choose to resize to this exact sizes?
what problems (if so...) can it cause?

thanks for the help man!!!

[45tripp]

you have to

[Pinstripes23]

...and WHEN you do resize to create compliant (S)VCD's, you are going to have to pad it on the top n bottom or else you your AR won't be correct.

[GangstaRap]

45tripp, okay, thanks man.

Pinstripes23, hehe youll' have to go easy with me...
what do you mean "pad it"?
you mean those black top and bottom margins?
wont them automatically created when i'm using the Resize filter?

thanks again!

[45tripp]

you mean those black top and bottom margins?

yes. borders.

wont them automatically created when i'm using the Resize filter?

no.

Resizing VCD/SVCD is not as straightfoward as resizing for DVD
At least for me.
read this resizing guide or just use the tables.
https://forum.videohelp.com/viewtopic.php?t=174200&postdays=0&postorder=asc&start=0

as an example.
taking your video going to 4:3 mpeg ntsc SVCD
you need to resize to 480x272
and add borders.
With vdub you tick the 'expand frame...' box and expand to 480x480



there's an app called avi resize calculator
to help you resize avi to dvd

[GangstaRap]

45tripp, wow! thanks for the great help!!!
just one last question;
in my "Filter Mode" tab the Default is "Nearest neighbor"...
should i leave it?
what is it anyway??

thanks again man!!!

[jagabo]

You almost always want to use the Lanczos3 resize filter. When enlarging you may sometimes want to use Bicubic.

Nearest neighbor is the poorest. It will generate lots of jaggies and moire artifacts.

Bilinear will generate moire artifacts when downsizing. It also gives the least sharp results.

Bicubic will generate moire artifacts when downsizing but gives a sharp picture. It gives sharp results when upsizing.

Lanczos3 generates sharp results when upsizing or downsizing. It generates the least moire artifacts.

Use FitCD to calculate the resizing parameters. Use the middle "MPEG resizing" section.

[GangstaRap]

jagabo, first of all, thanks man! really appreciate it!!!

is this the calculated size? the destination size?

did i miss something?

[manono]

Below where your picture is will be the AviSynth script. There will be an AddBorders line that will tell how many pixels of black are needed to pad out the resolution to 480x480. And you do realize that you're adding black to the sides and more than necessary to the top and bottom by having 2 blocks overscan don't you? The effect is also to lower the resolution. I don't know why that guy makes 2 blocks overscan the default. Unless you need it to make low subs visible, I'd set the blocks overscan to 0.

[guns1inger]

2 blocks in the default because many users of FitCD use it to bring subtitles back inside the overscan area because fan-subbers have no idea where subtitles should be. If you have badly positioned, hardcoded subs then you should leave it at 2 blocks.

2 blocks is also a good size when upscaling for DVD full-D1, as it reduces the amount of resizing without making visible borders (on most TVs) and the cost of the black to bitrate is minimal, so more goes to the image.

It is only when working with the stupidly low resolutions of VCD and SVCD that it becomes an issue.

[jagabo]

When using VirtualDub to resize, you add borders using the "Expand frame and letterbox image" section of the Resize filter.

[GangstaRap]

Thanks for postin guys!!!

And you do realize that you're adding black to the sides and more than necessary to the top and bottom by having 2 blocks overscan don't you? The effect is also to lower the resolution. I don't know why that guy makes 2 blocks overscan the default. Unless you need it to make low subs visible, I'd set the blocks overscan to 0.

i didnt relize till now...
but like guns1inger said - 2 blocks is the default... whatever the reason is...

If you have badly positioned, hardcoded subs then you should leave it at 2 blocks.

all this overscan issue really make my life miserable...
i hate it.
i guess because the zoomed videos i used to get when using ConvertXToDVD...
and i'm assuming this blocks will zoom out my video...
so i dont see the necessity in this option...
why do i need to add blocks for subtitles when i can just add top and bottom borders as much as i want by resizing the image...?

Below where your picture is will be the AviSynth script. There will be an AddBorders line that will tell how many pixels of black are needed to pad out the resolution to 480x480.

do you mean this?

where do i need to add those values?
do i even need to take it under consideration though i use VDubMOD to encode?
(its an AviSynth script... i guess...)

Thanks for the great help guys!
and if it seems like a rookies questions - i guess i'm guilty...

[guns1inger]

The blocks add the borders, top and bottom, and left and right. If you just resize to put borders top and bottom then you screw the aspect ratio. If you use the 2 blocks borders scripts in avisynth then you get the correct image size and aspect ratio all in one go. And ConvertXtoDVD will encode from an avisynth script so you can use it to get the correct image. FWIW, ConvertXtoDVD does not zoom images at all.

[DarrellS]

VDMod_resize doesn't come with VirtualDubMod. You have to download and install it.

I installed the Aud-X version of VirtualdubMod and it does come with this resize filter. It comes with a few other filters that don't come with Virtualdub or VirtualdubMod.





Here is the resize filter that comes with Virtualdub 1.7.2

[GangstaRap]

guns1inger, so those blocks are the pads that Pinstripes23 told me to add?

DarrellS, it seems like this filter you have is makin the whole calculations by itself and spares the headache...
where can i get one of this? is it free?

guns1inger, DarrellS, jagabo, manono,
THANKS FOR YOUR TIME AND YOUR PATIENT!!!

[manono]

The blocks add the borders, top and bottom, and left and right. If you just resize to put borders top and bottom then you screw the aspect ratio.

Eh? You're saying that script in FitCD will wind up giving him bad aspect ratio if he then encodes for 4:3? You're saying the only way to get good AR is to add blocks? I must be misunderstanding you. Sure, he might lose some picture to the overscan, but so what? This isn't the ConvertX Zooming thread.

[jagabo]

to fill out the frame use the "Expand frame and letterbox image" section of VirtualDub's Resize filter:



Or install AVISynth, use the Save Script button in FitCD to save the AVISynth script, then open that AVS file in VirtualDub (AVISynth will handle the resizing via the script).

[GangstaRap]

jagabo, Thanks for the tutorial man...
i think i caught the idea...

about the second advice...

Or install AVISynth, use the Save Script button in FitCD to save the AVISynth script, then open that AVS file in VirtualDub (AVISynth will handle the resizing via the script).

does VDubMOD knows how to handle AVISynth script?!?

[45tripp]

does VDubMOD knows how to handle AVISynth script?!?

with avisynth installed yes.
vdubmod will also give you informative error messages if there is something wrong with your script syntax

[DarrellS]

DarrellS, it seems like this filter you have is makin the whole calculations by itself and spares the headache...
where can i get one of this? is it free?

That's what I like about it. It comes in the newer Virtualdub releases. 1.7.1 and 1.7.2

Virtualdub is getting better with every release. Before long, it will have all the options that the mods have and more. The mods are getting no more updates ( the Audio-X build was the last build ) while Virtualdub is constantly updated.

Smart rendering makes the new versions the best and even though they don't have MPEG2 or WMV support yet, they can handle these formats with Avisynth script.

Virtualdub-MPEG2 might get one more update to include smart rendering, not sure yet. VirtualdubMod is finished, no more updates.

[guns1inger]

The blocks add the borders, top and bottom, and left and right. If you just resize to put borders top and bottom then you screw the aspect ratio.

Eh? You're saying that script in FitCD will wind up giving him bad aspect ratio if he then encodes for 4:3? You're saying the only way to get good AR is to add blocks? I must be misunderstanding you. Sure, he might lose some picture to the overscan, but so what? This isn't the ConvertX Zooming thread.

What was proposed earlier by the OP was simply resizing vertically, and adding top and bottom borders to push the image into the visible area, rather than use FitCDs borders because he didn't want to lose all that space. What I was trying to say (and obviously badly) is that FitCD is doing the right thing, and that his proposed technique would give him a screwed up AR, whereas FitCD would not.

[GangstaRap]

DarrellS, thanks for postin man!

and as you said, Virtualdub don't have MPEG2 support so i used to make a frame serving to TMPGEnc,
i think now i'll give it a shot with AviSynth script.
i'll try both FITCD and the Virtualdub's Resize Filter...

just one more thing:
i visited virtualdub's site and found only experimental 1.7.1 version...
is that the version with the wonder resize filter?