DVD2SVCD avisynth script help

[ilu_vatar]

I am wanting to use DVD2SVCD to convert 16/9 movies NTSC and PAL to SVCD but increasing the size of the picture to be displayed on a 4/3 TV.

I would like to know how to trim 75 pixels off the left and right side then resize to increase the picture size. I have been told that you can do this by modifying the avisynth script using the bicubicresize, crop & addborders command. I have looked through various information but they just confuse me even more

I would appreciate it if anybody could assist me on editing the avisynthscript

DVD NTSC 16/9 => NTSC SVCD (with 75 pixels cropped from both sides)
DVD PAL 16/9 => PAL SVCD (with 75 pixels cropped from both sides)

[bunyip]

For this example let's say the video is 700x400 (16:9) with 75px black borders left & right - this would mean that the actual viewable video is 550x400 (which is approximately 4:3) so all you need to do is remove the L/R borders and resize to SVCD.

Crop(75, 0, 550, 0) - [This is crop 75 off the left and take the next 550 pixels as the width].
BicubicResize(480,576,0.0,0.6) - [For PAL]
BicubicResize(480,480,0.0,0.6) - [For NTSC]

If the assumption about the black borders is not correct let me know.

[ilu_vatar]

Thank you ver much for your reply. You are right I don't want the borders along the left and right side, the only reason why I want to trim the sides is to increase the size of the picture on a 16:9 DVD.

But I have one question left, do I need to use the addborders command for the top and bottom of the picture to keep the aspect ratio right on a 4:3 TV? If I emmit the option to add borders the aspect ratio when displayed on the TV is all wrong.

[bunyip]

I get the impression here that you want to cut out the center of the picture and in fact drop the ends so that it fills the TV screen, the same way that the TV channels do when they show a wide screen movie. You don't want it to display as wide-screen on the TV.

Is that correct?

If so and the result is distorted it means that after the CROP step the result is not strickly 4:3 - so the CROP values are not correct - what is the width and height of the orginal?

[ilu_vatar]

That's right I don't want dI want to drop the ends so that it fills most of the screen while keeping the right aspect ratio. Filling the entire screen looses too much detail. I have noticed chopping 75 pixels from the left and the right and then resizing allows for a larger picture display without lossing any detail. It is easy with TMPGENC which does all the work for you but I like the quality of using CCE 2.50 in combination with DVD2SVCD.

My original source source is 720X576.

[bunyip]

Oh I see where we're going wrong, I thought your source was already 16:9 but it appears that it's full size but with black borders top and bottom already in the video.

In that case you need to crop these borders as well - and you will need to determine the resolution of the actual video.

So for the new example, if your actual video was 720x400 then it has 88 pixels of black on the top and bottom, making 720X576 in total. To get a final 4:3 result we need to end up with a width that is 1.33 times the height of the actual video i.e. 534 in this example, meaning that you need to trim 186 px (93 each side) from the width and 88px from the top. So the setting will be:

Crop(93, 88, 534, 400) [i.e. 93 in from the left, 88 down from the top and a width of 534, height of 400]
BicubicResize(480,576,0.0,0.6) - [For PAL]
BicubicResize(480,480,0.0,0.6) - [For NTSC]

But the crop values will depend on the actual viewable video width & height.

[ilu_vatar]

Thanks

[Mr Grumpy]

It's also worth having a look at FitCD (find it in the tools section)

It calculates the resizing stuff for you, allowing you to change how much you crop the original, what overscan your TV has, etc and builds the AVISynth script too.