Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion.

Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules.

 

Go Back   Doom9's Forum > (HD) DVD, Blu-ray & (S)VCD > One click suites for DVD backup and DVD creation

Reply
 
Thread Tools Search this Thread Display Modes
Old 7th June 2009, 23:52   #1  |  Link
MR Nice
Registered User
 
MR Nice's Avatar
 
Join Date: Sep 2007
Posts: 71
Convert 4:3 to widescreen letterbox without stretching the video

I dont know what section to put my query in so here go's, I have a small avi clip I did with my cam its 4:3, does anyone know of a program that can convert it to widescreen letterbox without the video looking stretched?

Last edited by Guest; 8th June 2009 at 03:58. Reason: rule 9
MR Nice is offline   Reply With Quote
Old 8th June 2009, 02:41   #2  |  Link
netmask
Registered User
 
netmask's Avatar
 
Join Date: Jan 2005
Location: Sydney Australia
Posts: 260
You can crop and resize in VirtualDub
__________________
SONY 75" Full array 200Hz LED TV
Yamaha A1070 amp
Zidoo UHD3000, Popcorn Hour A-500
BeyonWiz PVR T3 & V2 (Enigma2 clone)
Chromecast
Pioneer Bluray BDP-150-K
Windows 7 Ultimate
QNAP NAS TS851
netmask is offline   Reply With Quote
Old 9th June 2009, 12:36   #3  |  Link
Ghitulescu
Registered User
 
Ghitulescu's Avatar
 
Join Date: Mar 2009
Location: Germany
Posts: 5,770
I don't get it. WS LB is the way to watch 16:9 videos on 4:3 TVs.

The reverse situation is called pillar box, ie 4:3 image with black/grey blocks left and right. Some satellite providers broadcast this way.

So you have 2 options to fit 4:3 in 16:9 (1. and 2. are one option, 3. is the second one):
  1. crop the bottom and top by about 72 pixels each - do then a vertical resize if you want this to match a standard DVD resolution
  2. alternatively you can replace the cut out parts with black bars - it's called mating - that's a real LB. I think there is a filter in VDub, if not use crop and addborders.
  3. add left and right borders, about 120 pixels each - then you might rescale it to 720 horizontal pixels (DVD compliant).
So, in option 1 (points 1. or 2. above) you'll lose parts of the image, in option 2 (point 3.) you'll have the side bars.

If you rescale from 432 to 576 you'll have an anamorph 16:9 video but the scaling will look bad on average to bad quality videos. It will be displayed as WS LB on 4:3 TVs if Letterbox is activated on your player, and 16:9 on 16:9 TVs ("zoom" activated).

For option 2, if shrunk to 720x576, it will be displayed as 4:3 on 4:3 TVs and as pillarbox on 16:9 if your player has pan&scan.
Ghitulescu is offline   Reply With Quote
Old 21st June 2009, 23:24   #4  |  Link
MR Nice
Registered User
 
MR Nice's Avatar
 
Join Date: Sep 2007
Posts: 71
Ghitulescu I did try some of the things you said but, it looks stretched when I play it back on full screen tv. I don't know if there is a program tha can convert 4:3 to a true 16:9 ratio. I googled, tried some other ideas but to no avail. Anyway thanks to you both for your help I am greatful.
MR Nice is offline   Reply With Quote
Old 21st June 2009, 23:44   #5  |  Link
Keiyakusha
契約者
 
Keiyakusha's Avatar
 
Join Date: Jun 2008
Posts: 1,576
If you have 4x3 video (like this), then there is no way to make 16x9 from it, exept cropping some parts (like here).

Oops, you want letterbox? Then add black bars using avisynth Addborders() command. It will be something like this.

Last edited by Keiyakusha; 21st June 2009 at 23:53.
Keiyakusha is offline   Reply With Quote
Old 23rd June 2009, 09:28   #6  |  Link
MR Nice
Registered User
 
MR Nice's Avatar
 
Join Date: Sep 2007
Posts: 71
Quote:
Originally Posted by Keiyakusha View Post
If you have 4x3 video (like this), then there is no way to make 16x9 from it, exept cropping some parts (like here).

Oops, you want letterbox? Then add black bars using avisynth Addborders() command. It will be something like this.
Is there a tutorial on how to did with avisynth? I did crop the 4:3 in virtualdub but it looks stretched on my widescreen tv.
MR Nice is offline   Reply With Quote
Old 23rd June 2009, 13:13   #7  |  Link
Ghitulescu
Registered User
 
Ghitulescu's Avatar
 
Join Date: Mar 2009
Location: Germany
Posts: 5,770
There is no known way of fixing a 4:3 image into a 16:9 bit-per-bit.

You have to stretch it, to cut off parts of it or to add "dummy" parts.

Of course, your TV should also be prepared to this material (zoom, wide, full, cinema etc.). For instance, a pure 16:9 clip will look stretched if seen in wide modus.

Zoom or similar enlarge the image vertically so the very upper and the very lower parts are not seen (same as cutting them out, then stretching the image to full screen - because you need the video to be conform to standards).

Wide does a sort of "Wide angle" transformation: the closer to margins the higher the distorsion (people at screen edges look fatter ).

Full stretches the image (people look squeezed) in vertical.

Cinema is a combination of zoom with full (cut+squeeze).

4:3 is shown with L/R vertical mates (black or grey).

It's your decision what method you want to use.
Ghitulescu is offline   Reply With Quote
Old 23rd June 2009, 14:19   #8  |  Link
MR Nice
Registered User
 
MR Nice's Avatar
 
Join Date: Sep 2007
Posts: 71
I found another way around the problem I used photoshop, using a black background I cut out the shape I wanted, and then I reized the video to fit into the layered cut out section. Now it looks great no stretching on wide full screen tv.
MR Nice is offline   Reply With Quote
Old 23rd October 2015, 21:18   #9  |  Link
mäger
Registered User
 
Join Date: Mar 2009
Posts: 35
how could i add the ambient borders like they do on tv these days now? (to make the poor iphone footage look like 16:9)
mäger is offline   Reply With Quote
Old 24th October 2015, 10:34   #10  |  Link
huhn
Registered User
 
Join Date: Oct 2012
Posts: 7,998
this thread is pretty old but you simply need simple math.

first you need the DAR resolution and scale the PAR to it with 1:1. this can be skipped in most cases.

the rest is simple math.
example:
640x480 = 4:3

((480/9)*16-640)/2 = 106.7

source(4:3 640x480.mkv).Addborders(106,0,106,0)

result= 852x480
huhn is offline   Reply With Quote
Old 25th October 2015, 04:07   #11  |  Link
raffriff42
Retried Guesser
 
raffriff42's Avatar
 
Join Date: Jun 2012
Posts: 1,373
Quote:
Originally Posted by mäger View Post
how could i add the ambient borders like they do on tv these days now? (to make the poor iphone footage look like 16:9)
This has been discussed before, but I don't remember where. You do something like, stretch the video to full 16:9 width, but blur it and reduce contrast; then overlay the original video in the center.
Code:
## Last=...
ConvertToYV12
new_wid = Round(Float(Height)*16.0/9.0)
new_wid = new_wid - (new_wid % 4)
Last.BilinearResize(Width/4, Height/4)
\   .Blur(1.0).Blur(1.0).Blur(1.0)
\   .BilinearResize(new_wid, Height)
\   .Tweak(bright=-24, cont=0.7, sat=0.5) [* adjust to taste *]
\   .ColorYUV(off_u=10, off_v=-10)        [* adjust to taste *]
\   .Overlay(Last, x=new_wid/2-Width/2, y=0)
https://www.dropbox.com/s/6l2mmlzq02...t-01.jpg?raw=1

Last edited by raffriff42; 17th March 2017 at 00:03. Reason: (fixed image link)
raffriff42 is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 09:46.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.