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View Full Version : Virtual Dub - problems cropping - HELP!!!!



yage73
01-23-2005, 06:14 AM
Hi all!

I am currently trying to make a movie.

I have captured video using Fraps 2.0

However, I'am have no luck cropping the video.

I take it that I load my vid? then select:
video > filters > add > null transform > cropping.

Thing is, when the vid is selected and I do the above, the Y1 axis can be changed but the Y2 axis is off the screen and OK cannot be selected.
http://forums.ubi.com/images/smilies/354.gif
Where am I going wrong?

Could somebody give detailed instructions as to how to crop. I have looked at "filmmaking101"
on the VWC site but I can't see where I'm going wrong? http://forums.ubi.com/images/smilies/cry.gif

Heeeeelp!

yage73
01-23-2005, 06:14 AM
Hi all!

I am currently trying to make a movie.

I have captured video using Fraps 2.0

However, I'am have no luck cropping the video.

I take it that I load my vid? then select:
video > filters > add > null transform > cropping.

Thing is, when the vid is selected and I do the above, the Y1 axis can be changed but the Y2 axis is off the screen and OK cannot be selected.
http://forums.ubi.com/images/smilies/354.gif
Where am I going wrong?

Could somebody give detailed instructions as to how to crop. I have looked at "filmmaking101"
on the VWC site but I can't see where I'm going wrong? http://forums.ubi.com/images/smilies/cry.gif

Heeeeelp!

deepo_HP
01-23-2005, 10:52 AM
hi yage,

have you tried to type in the number of lines to crop instead of using the buttons?
also the size of the frame may never reach zero or negative values after cropping (accidentally).

Fliegeroffizier
01-23-2005, 11:41 AM
<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by yage73:
...However, I'am have no luck cropping the video.

I take it that I load my vid? then select:
video &gt; filters &gt; add &gt; null transform &gt; cropping.

<HR></BLOCKQUOTE>

Someone will soon give you the full answer...but here is mine.

I never use the "null transform" option/filter..somehow I have the impression that those who do are trying to get a different aspect ratio "look" to the final product(like 16:9 instead of the normal 4:3)...they use nulltransform to sorta add black 'space' top and bottom of the movie(...?...)

In my case(s), I go video/filters/ and then "Add" ANY filter, even if you don't need it...for example, you can Add "HSV adjust"(but don't adjust any settings if you dont want to...just leave tham at the default settings).

Now with that "filter" highlighted/selected, you can go into "cropping"... You shouldn't have any trouble changing any of the X1/x2/y1/y2 settings. I've followed this procedure MANY Hundreds of times with no problems. If you still encounter a problem, then I suspect it Might be due to something odd about your input video file.

Good Luck

JavDog
01-23-2005, 12:04 PM
Yage,
This is funny, cuz it happend to me as well my first time.

Your doing everything right, its just for some **** reason the window to crop is oversized and off-set on your monitor. So you cant fully crop the screen. Click and hold the top of the window and move it over till you can get the WHOLE crop window in your view. Then just move your "new" edge to the desired location then hit the "OK". That simple...like I said it happend to me too! http://forums.ubi.com/images/smilies/16x16_smiley-very-happy.gif

yage73
01-23-2005, 12:59 PM
hi guys

Fliegeroffizier, JavDog and deepo_HP thanx guys http://forums.ubi.com/images/smilies/11.gif

Got it working http://forums.ubi.com/images/smilies/25.gif

deepo_HP
01-23-2005, 09:12 PM
hi fliegeroffizier,

the way you described is exactly the same kind of cropping done with 'nulltransform'.
'nulltransform' has the only (but pretty good) reason to use, that some filters are written in a way, that, if cropping is done within the filter-settings, first the filter is applied and then the frame cropped. which means not only a considerable longer render-time, but ion some cases also eventually artifacts (when a filter takes an average of pixels in amount for example).
with "adding black space" you meant probably 'letterboxing', which is indeed not only a loss in information, but can also give visible decreased compression-results - generally any static colour around the frame should be avoided!
anyway, cropping with 'nulltransform' as first step in the filterlist is the same 'cropping' as in the filtersettings, but will spare you time for sure.