[MPlayer-dev-eng] Re: [PATCH] VFCTRL_PERIODIC_UPDATE

[Jason Tackaberry]

On Mon, 2007-01-22 at 21:25 +0200, Uoti Urpala wrote:
> A vo extension to allow editing the currently visible frame, implemented
> at least for xv, might be the most practical way.

The way I did this for xine was to create a special vo driver that
blended the overlay before handing off the frame to the real vo driver.
The reason I did it this way was because xine has no notion of
unbuffered post plugins, so if implemented as a post plugin (i.e. vf) it
would be several (up to 10 or so) frames behind. 

Perhaps this approach may also work here, and has the added benefit of
being vo-agnostic.  So we have a special overlay vo that passes through
to the real vo driver after blending the overlay.  And if the overlay is
off, it will use DR and/or slices if possible (supported by the target
vo).  So something like -vo
overlay:shmkey=12345678:passthrough=xv:port=79

Comments?

Cheers,
Jason.