[MPlayer-dev-eng] [PATCH] A new ASS renderer

[Reimar Döffinger]

On 24 Sep 2012, at 00:20, Vladimir Mosgalin <mosgalin at VM10124.spb.edu> wrote:
> Hi Reimar Döffinger!
> 
> On 2012.09.23 at 23:49:25 +0200, Reimar Döffinger wrote next:
> 
>> Even stranger: even without this patch, the driver does not use any relevant amount of CPU at all when using the OpenSource driver, basically freetype is using all of it (I used a trivially decodable video with those subs).
>> Only the closed-source driver is a bit of an issue.
>> I'll have to read up on the thread again, but did we ever figure out why some strange expand filter magic made a difference?
>> Admittedly this is using some Radeon 5700 card.
> 
> Well, another quick check has shown that new versions of drm & mesa &
> gallium made no difference: on Fedora 17 w/ Radeon 4870 there is exactly
> same effect as on Fedora 14 with Radeon 1900.
> 
> The karaoke subtitles in question on 1920x1080 video raise CPU usage
> from 36% to >100% (& >10% frames dropped) when rendered with vo_gl
> compared to -vf ass; doesn't matter if it's in window or fullscreen.
> 
> I have karaoke and non-karaoke version of these subtitles. Non-karaoke
> version prints line only on subtitles change
> EOSD counts (tiny, small, all): 1, 1, 162
> A:  23.2 V:  23.2 A-V:  0.000 ct:  0.075   0/  0  3% 26%  6.0% 6 0 68% 
> EOSD counts (tiny, small, all): 1, 5, 178
> A:  30.2 V:  30.2 A-V: -0.001 ct:  0.074   0/  0  2% 23%  6.2% 6 0 59% 
> EOSD counts (tiny, small, all): 3, 5, 102
> 
> Karaoke prints it all the time
> EOSD counts (tiny, small, all): 22, 2, 164
> A:  16.7 V:  16.7 A-V: -0.000 ct:  0.053   0/  0  1% 29%  6.7% 0 0 74% 

Uh, MPlayer is of the opinion that it uses only 36% CPU, and only 6% more than the non-karaoke case.
That matches what I am seeing, except that that really is the real CPU usage for me.
I'm starting to think that there is something very specific to your setup going on.