I am running the latest webkit trunk under 64-bit linux using the arora browser and even through webkit seems to recognize the swfdec plugin as being captable of handling .swf files, instead of the video only a white square is shown.
The plugin works fine in other browsers (tested in firefox)
The swfdec version I'm using is trunk to.
I know that this is not much information, but I'm willing to provide backtraces or such stuff, as long as somebody tells me what is needed and how I can produce it :)
Ops, looks like this task has gotten quite stale.
Have you tried this with a more recent trunk?
I use Arora on 64 bits Linux, I don't have any problem.
Be sure to enable flash (and maybe disable "click to flash", it does not work great on all websites).
Closing the task, I guess I has been fixed a long time ago.