[MPlayer-users] high-res videos too slow, where's the bottleneck?

[Arpi]

Hi,

> I've got the same movie in two different sizes/formats so I can compare some 
> things: variant A has a resolution of 720x576 with black borders encoded 
> above and below and variant B contains just the 'active area' with a 
> resolution of 704x416. The bitrate of the low-res movie is even higher 
> (A:100kB/s vs B:140kB/s). Now to the result: The low-res movie can be played 
> flawlessly with lots of cpu-time left over (around 40%), however the big 
> stream hogs the cpu completely and playback is very choppy. I doubt that the 
> cpu is too slow to decode the movie itself because if I discard the 
> video-output ('-vo null') the cpu usage is nearly identical (27% vs 28%). 

a big part of video out is done by X11, it isn't measured by mplayer. check
with 'top'.

> Somehow the problem must reside in the amount of transferred image pixels. Is 
> colorspace conversion falsely NOT done by hardware? Or is the RAM too slow to 
> cope with the fullscreen images?
unless you use GATOS with ATI card, it will be all software and very slow copy to
video memory. use gatos.

> ATI Rage 128 AGP 32M


A'rpi / Astral & ESP-team

--
mailto:arpi at thot.banki.hu
http://esp-team.scene.hu