[MPlayer-dev-eng] Re: [PATCH] SSA/ASS subtitles support

[Uoti Urpala]

On Mon, 2006-06-05 at 04:21 +0400, Evgeniy Stepanov wrote:
> Another idea: vo capable of "extended osd" could call rendering functions from 
> libass itself when it is ready and blend the resulting bitmaps immediately. 
> This could be wrapped in a nice call like get_extended_osd_bitmaps(double 
> pts). vf_ass is only added if vo does not support this.

I think this could be the clearest solution. Basically place the filter
"inside the vo" if the vo supports that, otherwise place it in the
normal filter chain.

> > supports the "extended" OSD (could also be used to check if there is
> > a filter in between vf_ass and the vo that would break thinks, like the

> This makes sense only if something between vf_ass and vo is messing with 
> frames. I hope we can avoid this situation completely by adding vf_ass to the 
> very end of the filter chain.

I think vf_ass should be usable as a general filter that can be placed
anywhere in the chain when the vo special cases aren't used (not sure if
you meant the "end of the filter chain" in the render-inside-vo case
only - if so then this is of course irrelevant if there's no filter in
the normal chain then).