how to convert 4:3 video to 16:9

[ClawS]

hi guys i have a dvd ntsc with 720x480 resolution wan tot covert it to 16.9 Ar... read these threads
http://forum.doom9.org/showthread.php?t=116516

but dint solve any one there to help??

[ClawS]

suggestions would be greatdull guys...

[Yellow_]

SimpleSlugUpscale? Overkill for this but does the job I think.

[Keiyakusha]

ClawS
Post a screenshot of your video.
It it meant to be 4x3 and you want it to be 16x9, you need to crop 60 pixels from the top and the bottom. If you want square pixels, you also need to resize it to 640x360 after cropping or to whatever resolution you like more.

However if video already anamorphic 16x9, you need to set appropriate --sar when you encoding the video and/or DAR when you muxing it. Or just resize to any 16x9 resolution you want (maybe with cropping black borders before this)

[wonkey_monkey]

If you want square pixels, you also need to resize it to 640x360

But only after you've cropped it again by 8 pixels at both left and right (to 704x360), to allow for Nominal Analogue Blanking (http://en.wikipedia.org/wiki/Nominal_analogue_blanking) - if you like to be picky about these things ;)

David

[Keiyakusha]

But only after you've cropped it again by 8 pixels at both left and right (to 704x360), to allow for Nominal Analogue Blanking (http://en.wikipedia.org/wiki/Nominal_analogue_blanking) - if you like to be picky about these things ;)

David

Yes, if originally video ment to be 4x3, some black borders should be cropped, but if this is new 16x9 DVD, this is not always true. There is dozens of DVDs that doesn't have black borders and doesn't need to be cropped like that. That's why we need some screenshots.

[ClawS]

Sure Bros geeting some SS now... in 2 mins

[ClawS]

http://lookpic.com/d2/i2/1772/5dgXJn8G.png
http://lookpic.com/d2/i2/1772/5dgXJn8G.png (http://lookpic.com/d2/i2/1772/5dgXJn8G.png)
here is the screen shot.... tried Fit cd with following commands...

LanczosResize(672,320,10,76,700,334)
AddBorders(16,80,16,80)
#Trim(0,242657).FadeOut(150)

But i donot need borders and etc coz need to do a dvd rip

[wonkey_monkey]

Yes, if originally video ment to be 4x3, some black borders should be cropped, but if this is new 16x9 DVD, this is not always true. There is dozens of DVDs that doesn't have black borders and doesn't need to be cropped like that. That's why we need some screenshots.

All DVD content, whether the picture fills the 720 width or not, should be cropped to 704 (702 for PAL) to give a 4:3/16:9 frame - if it's been mastered correctly. But as the difference is only 2%, you'd be hard pushed to determine that for sure unless you've got some face-on perfect circles in the video.

David

[ClawS]

All DVD content, whether the picture fills the 720 width or not, should be cropped to 704 (702 for PAL) to give a 4:3/16:9 frame - if it's been mastered correctly. But as the difference is only 2%, you'd be hard pushed to determine that for sure unless you've got some face-on perfect circles in the video.

David

yeah but the screens look for different Ars irrespective of cropping and etc

[ClawS]

hey horman can u say how to achive with any script or software?

[Keiyakusha]

All DVD content, whether the picture fills the 720 width or not, should be cropped to 704 (702 for PAL) to give a 4:3/16:9 frame - if it's been mastered correctly.
This is what some paper says but not the reality. Yes, maybe you can say they mastered incorrectly. but no one cares since it doesn't breaks compatibility. Also I don't know about USA, what I'm saying is valid for Asian countries and some in Europe.
Of course perfect circles is the best way to determine what is where...

ClawS
Hmm, this is something unusual... Just crop black borders and resize width to 640. It looks fine then but I never saw such aspect ratio that you'll getting here...

[ClawS]

Hey keiyakusha can u add me on messneger Bro please... @

[Keiyakusha]

Sorry, I'm not using any messengers except IRC and don't even know what MSN looks like.

Anyway I don't know how to deal with this source correctly. This is some unusual case. You can:
- crop borders and resize width to 640. but height will be 334px which is not really good and need to be overcropped or resized to 336
- сrop borders and resize to 720x376. Which I like more and upscaling anyway better than downscaling. This will be something like lanczosresize(720,376,0,73,0,-73)
- you can crop borders, resise height to 336 and make it anamorphic using SAR 8:9

[ClawS]

Thanks Dude will surely try rhat...

[wonkey_monkey]

I would (if possible, I think it depends on the codec and player) crop to 720x332 (better to lose two lines than interpolate) and set a custom DAR or NTSC PAR.

This way you don't interpolate any source pixels, and you've got the flexibility of being able to later use whatever kind of scaling is available at playback. If you have to resize, consider something more intelligent than lanzcos, such as one of the EEDIs or NNEDIs.

[manono]

tried Fit cd with following commands...

LanczosResize(672,320,10,76,700,334)
AddBorders(16,80,16,80)
#Trim(0,242657).FadeOut(150)
Is this for DVD? If not your script makes no sense at all since it's for converting 4:3 DVDs to 16:9 DVDs. And if it is for DVD, lose FitCD's default '2 blocks overscan'.

[EuropeanMan]

imagesource("c:\users\desktop\test.png")
converttoyv12()
crop(0,60,0,-60)
spline36resize(720,480)

------------
resulting output @ 16:9 looks fine i guess...but we need a sample of your video to determine what to crop and how much...

[Alex_ander]

Yeah, cropping exactly 1/4 of height (60+60 here) and resizing it back keeps image proportions unmodified (with 16:9 DVD encoding).

Independently of that ("1/4" is a global thing), if there are vertical borders in source files, then the DVD authors most likely meant to display it in ITU 601 proportions (fill the screen with 704x480 part of image). By mpeg2 standards (ITU's H.262), there is just one correct way to do with 720 size: to use the sequence_display_extention optional parameter (explicitly write to stream the pixel numbers corresponding to 4:3, for altered sar calculation). If it is not present, by H.262 the available 720x480 will fill the screen with the specified DAR. So if e.g. GSpot doesn't show it (most often it does not - unless pan&scan 540x480 is used), then it's not 'correct mastering' since by default a standard mpeg2 decoder will display it in slightly wrong proportions. It would be more safe in that case to crop horizontally to 704 and encode to 704x480 (to avoid 'forced 601' in some players).

[EuropeanMan]

^ Agreed 100%.