[Dvdauthor-users] spumux and buttons/highlights

[Kevin B. <co...@co...>]

I've been trying to add some menus to a dvd I'm putting together and ran
into a couple errors I'm curious about.  This is using dvdauthor 0.6.7.

First question, is it spumux or the dvd spec that disallows highlights
with transparent areas inside them?  When trying to define a highlight
region that is an outline box, spumux fails to find the button region.
ie:

With a highlight image containing a pair of regions like this:

  xxxxxxxxx    xxxxxxxxx
  x       x    x       x
  x       x    x       x
  x       x    x       x
  xxxxxxxxx    xxxxxxxxx

spumux won't allow me to define a pair of buttons in these regions,
failing with a message about no defined buttons.  Both
autooutline="infer" and defined button regions fail for this case.  With
defined button regions, and both an image and highlight PNG file, the
output looks like:

w=720, h=480, bd=8, ct=6
png had 2 colors
w=720, h=480, bd=8, ct=6
png had 38 colors
constructing blank sel
Cannot pick button masks
blank image, skipping line -1
Segmentation fault

If I cut those images down to just be upper lines, rather than boxes,
then spumux will generate them ok.  So, there are a couple questions
here...  Are highlights with transparent regions inside them allowed in
menus?  If so, can I get spumux to generate them?

What I'm attempting is a menu with moving video clips in the two boxes. 
So that rather than buttons, you see a 30 second title clip inside the
highlight.

So, second item.  I tried using an image with just the two boxes
(filled) above cut out for the background (image="bgrd.png").  What is
the limitation on number of colors?  I thought the main image was not
limited to 4 or 16 colors, however spumux will abort on a large number
of colors in the main image.  ie, I used a blue gradient image and get:

w=720, h=480, bd=8, ct=6
png had 104 colors
spumux: src/subgen.c:220: findmasterpal: Assertion `s->numpal<16'
failed.
Aborted

After cutting the main image down to one main color, I can get paste
this, but then spumux tells me it cannot find color 000000.  At this
point, the image is a solid blue wipe, with 2 transparent boxes cut
out.  Is there a requirement that the image contain some black pixels? 
I filled the two boxes with solid black as an experiment, and spumux is
happy to render the menu.  Of course, you can't see the movie clips
through the black :), but that was just a trial.

-- 
Kevin