StackVertical issue

[fabiospark]

I'm making a slow motion with MVTools2 and need to visually compare the resulting clip of two different MVTools2 settings, so I wrote this little script:

a=avisource("Fabio slomo 1.5 blksize 8.avi")
b=avisource("Fabio slomo 1.5 blksize 4.avi")
StackVertical(a,b)

(I tried with StackHorizontal too).

When I load the script into Virtualdub I get this funny behaviour:

if the focus is on Vdub window I can see only one clip but if I move the focus on another window (even minimized) leaving the Vdub window visible, I can see the two clips stacked. If I click on the Vdub window again the stack disappears and I can see one clip only.

I thought it was just a realtime viewing problem so I rendered the stack to an uncompressed AVI file but when I load this file into Vdub or in MPCHC the behaviour is the same! Even if the file is two times bigger then the singles ones.

Is this normal?
If not, is there anything I can do to prevent this happening?

Thanks.

[Inspector.Gadget]

This is a renderer issue, I think. One way to deal with it might be to open a third clip (any movie will do) in the background in WMP or MPC, pause it, and then minimize it and then use VDub as usual.

[fabiospark]

I tried but it does not work.
With a third clip paused in MPCHC in the background or minimized.

Thanks.

Edit: more testing.

Double clip in Vdub stopped, notepad window open = stack visible
Start playback in Vdub, notepad window goes hidden = stack not visible
While Vdub playing open Notepad window = playback keeps on with stack not visible

Thanks again.

[2Bdecided]

I've had some weird things happen in VirtualDub with large videos.
Try resizing to half size in the script at the end. Hardly a solution, but might let you see something!

Cheers,
David.

[wonkey_monkey]

Are you using video overlay in VirtualDub?

David

[fabiospark]

With a resize the avs works directly in Vdub.

Thanks.