On Mon, Sep 18, 2006 at 11:39:57AM +0200, Martin Wache wrote:
> Can you please point out to me what the advantage of using the
> subpicture layer is? To me it looks like the main speed change is that
> you don't scale the osd. Or does the change to YV12 colourspace bring
> some speed advantage?
Some time ago, I tested replacing the YUY2 colour space conversion
with a memcpy(). The memcpy() was about twice as fast on my
900 MHz Celeron, saving another 10% to 15% of CPU. On his 450 MHz P2,
this change is probably crucial.
I occasionally get dropped frames on my 900 MHz Celeron on dfb:mgatv but
not on dfb output. I think this is mainly due to the colour space
conversion. Dropped frames do occur more frequently when the OSD layer
is displayed, though.
Marko
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