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

[Michael Niedermayer]

Hi

On Wed, Jan 24, 2007 at 02:58:57PM +0200, Uoti Urpala wrote:
> On Wed, 2007-01-24 at 12:31 +0100, Michael Niedermayer wrote:
> > my "solution" simple is to ignore the VO state and prevent frames which
> > are in the far furture from passing trough the overlay filter too early
> > one simple way to do this is to block them before the filter chain another
> 
> Fails when you consider filters that add frames or adjust pts. Even
> ignoring that I wouldn't want to implement such timing.
> 
> More generally schemes like this depend on assumptions about (lack of)
> further buffering, and I don't want to add any such assumptions to the
> filter chain.
> 
> > is to duplicate the last frame in the overlay filter if the filter system
> > can handle that currently (it did work once at least from a user point of
> > view)
> > 
> > with that the time between the 2 frames in the VO is guranteed to be small
> 
> You could generate extra frames in the overlay filter to maintain a high
> framerate, but that would cause significant extra load and within the
> filter there would be no easy way to ensure the load would not interfere
> with the main video playback (and in any case it would interfere with
> other use of the machine).
> 
> Overall I think it's best to have a general filter that draws the
> overlay once per frame and with no guarantees about latency (but which
> currently shouldn't be bad with high-fps video) and leave
> frame-independent updates with guaranteed low latency as vo-specific
> features.

ok, ive no objections to this

[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

In a rich man's house there is no place to spit but his face.
-- Diogenes of Sinope
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