Avisynth: Addborder?
 

Can someone tell me, what does Addborder do, how does it work? Or can you point me to a readme or something :)

//Wolfi

Avisynth manual that is on you disc, in the directory of avisynth2.52 (folder named "Docs", simple no ? ;-)

Or There

Addborder adds black borders and letterbox cuts them of, have I understand it right?

//Wolfi

No, you make a mistake :

Addborders adds borders around the picture, making the size of the picture to change (if you have a 320*240 picture and add a 8 pixels border of all four side - Addborders(8,8,8,8 ) - you will have a picture of 336*256)

Letterbox puts borders onto the picture, without changing the size of the picture (if you have a 320*240 picture and add a 8 pixels border of all four side - Letterbox(8,8,8,8 ) - you will still have a picture of 320*240)

So why do you wanna add borders around the picture to make the resolution bigger? Won't that lower the CQ and than the quality?

//Wolfi

good question.
8O

yeah...why :?:
:?

You're making the actual "FILM PIXELS" area smaller. Not larger :!:

-kwag

:?
now is worse for me!

Phil wrote:
"Addborders adds borders around the picture,
making the size of the picture to change ..."

wolfi ask:
"So why do you wanna add borders around the
picture to make the resolution bigger? "

Kwag answer:
"You're making the actual "FILM PIXELS" area smaller. Not larger :!: "

8O
then i misunderstand everything!
:?
now i need help.

Take a big breath Jorel and relax. Everything is under control :-)

We NEVER resize a picture to 352*240 picture and add a 8 pixel border. We first do a picture of 336*224 pixels (by resizing) and THEN add the border in order to obtain the valid resolution for VCD 352*240.

Of course, that is the same thing whatever the res you use, I just give you an example.

352*240 is the picture size and 336*224 is the film area

You do this everyday is you use Moviestacker and you never notice this ? :-)
[/code]

oh yes Phil,
and i use addborders....i did like"blind flight",
now i "see" how it works!

thanks!
:wink:

If I've understand it all right... addborder deletes for example 8 pixels of the film area, and the 8 pixels film area who deletes compensates with 8 pixels blackboarders on each side (Addborders(8,8,8,8 ) ) , am I right :?:

So why do you do this, why add 8 pixels black borders? Is it because you wont see those 8 pixels anyway when you look at the telvision?

//Wolfi

No :!: That is Letterbox that does that !
That's what I wanted to say by "onto" the picture for letterbox (vs "around" for addborder). Perhaps my english is too poor to make you understand the difference. Kwag help me please :-)

Yes it is ! That what is called the "TV overscan" : TV sets are setted to "eat" a part of the image on every side. So its useless to put image there and a black border will take less place to encode.

No Dialhot I think your english is great, better then mine at least :lol: I'm not done with learning english in school, 15 years old so I have a few years of english infront of me to learn...so sometimes I dont understand "hard" sentences clearerly right :oops:

And now to the point...so you can say both letterbox and addborders saves quality :?:

//Wolfi

Yes they do !

In fact I use Letterbox only in one case : when the source size matches exactly the destination size I want. In this case, using Addborders will ask for a resizing (because, as you understood I hope, Addborders changes the size of the picture) and I prefer to avoid it.