I got a way to solve it!
I also used to get that -12004 error every time I tried to build the disc image in a certain Adobe Encore CS3 project.
My Encore project had 2 AVI files in just 1 timeline.
So, “AVI 1” was “Chapter 1” and “AVI 2” was “Chapter 2” in the timeline, however, Adobe Encore CS3 has crashed (Unknown error -12004)
The solution:
I created 2 Timelines:
“Timeline 1” with “AVI 1”
“Timeline 2” with “AVI 2”
“Timeline 1” -> “end action” = Timeline 2
Why did I need to separate in 2 timelines?
I really don’t know … I use to make projects with several files in a single timeline without problems, but this time it didn’t work.
Hope this can help you,
Good luck!