getting rid of border on VOB files

[djdust]

Hi all

I've used DVD Decrypter to rip VOB files from a DVD - all the results though have a distinctive black border around them. When converting the files to AVI (I'm using Auto GK at the moment), the border remains. Is there an easy way to get rid of it?

Cheers

Daz

[gadgetguy]

The black border is to compensate for overscan. Any attempt to remove it will result in lower quality as it will require reencoding.

[djdust]

ok, I understood half of that...

Is there somewhere I can learn more about this?

[Pinstripes23]

https://www.videohelp.com/glossary?O#Overscan



well since you're converting you can crop them out. You have to modify the avisynth script using the crop command.

http://www.avisynth.org/Crop

Depending on your source you may have to adjust how much you crop from each side though, in order to keep the correct AR. It's been a long time since I tried out auto gk but I think you should be able to modify the script manually before the actual encoding.

[manono]

If you're using AutoGK, then the black borders should already have been cropped away. I suspect your player is putting them back in when playing the AVI, in order to keep the proper aspect ratio. One way to confirm (or disprove) that notion is to open the AVI in VDub(Mod) and scroll around. If you don't see any black borders, then there's none in the AVI. If you do see black borders, then something else is at work.

That something else could be a changing AR in the movie. That is, different amounts of black during different parts of the movie. Either that or AutoGK just messed up, although that's highly unusual. There are 3 ways around that, all of which involve going into the Hidden Options of AutoGK when setting it up (CTRL-F9). One way would be to have the AutoCrop scan a larger part of the video by increasing the number of frames to examine. You can also increase the AutoCrop Threshold. And as a final resort, you can manually crop the video. All options are explained in the included tutorial:

Sometimes auto crop used with default parameters by AutoGK cannot totally remove black bars or removes too much of a movie material. In this case "Tune auto crop parameters" is very handy. Threshold defines how sensitive auto crop will be: the higher the value the more cropping will be done. To completely disable audio crop you can set threshold to 0. "Number of frames to examine" is useful parameter to change if movie is a mixture of full screen/wide screen shots, so by selecting different frames that auto crop examines you can improve cropping process. "Starting frame" can help auto crop in situation when you have a full screen logo as a part of widescreen movie, in which case autocrop might decide that the whole source is full screen. By selecting a different starting frames you force auto crop not to examine irrelevant starting movie sequence. "Force cropping" option allows you to crop additional pixels after autocrop operation (if you find that you need to always crop several more pixels you can use this option). If you disable autocrop with threshold 0 then "force cropping" option becomes fully manual crop. Remember always to check how movie looks like after you set new auto crop parameters using Preview function of AutoGK.

http://www.autogk.me.uk/modules.php?name=TutorialEN#6

[djdust]

If you're using AutoGK, then the black borders should already have been cropped away. I suspect your player is putting them back in when playing the AVI, in order to keep the proper aspect ratio. One way to confirm (or disprove) that notion is to open the AVI in VDub(Mod) and scroll around.

You're absolutely right - the black borders HAVE been cropped out so, no need for this post after all!

Thanks everyone