secco

there's sometihing I don't understand about how jitter handles video playback with quicktime. I'm on WinXP.

when I play a mpeg1 movie without jitter simply with the desktop quicktime player it runs absolutely smooth and with 15% average CPU load.

when I start the same mpeg1 file in jitter with jit.qt.movie the CPU load varies between 30 and 80% and the video stutters with framerates between 3 and 5 fps!!

Using photojpg instead of mpeg1 works better but why?! And it's still not 25fps.

When I compare mpeg1 with pjpeg in the Quicktime desktop player, mpeg1 always runs smoother and with 25fps.

there's sometihing I don't understand about how jitter handles video playback with quicktime. I'm on WinXP.
when I play a mpeg1 movie without jitter simply with the desktop quicktime player it runs absolutely smooth and with 15% average CPU load.
when I start the same mpeg1 file in jitter with jit.qt.movie the CPU load varies between 30 and 80% and the video stutters with framerates between 3 and 5 fps!!
Using photojpg instead of mpeg1 works better but why?! And it's still not 25fps.
When I compare mpeg1 with pjpeg in the Quicktime desktop player, mpeg1 always runs smoother and with 25fps.

why-is-mpeg-video-playback-so-slow-and-cpu-intensive

my suspicion is that this happens because quicktime for windows is 

On Aug 16, 2007, at 5:51 AM, secco wrote:

> there's sometihing I don't understand about how jitter handles 

> video playback with quicktime. I'm on WinXP.

> when I play a mpeg1 movie without jitter simply with the desktop 

> quicktime player it runs absolutely smooth and with 15% average CPU 

> when I start the same mpeg1 file in jitter with jit.qt.movie the 

> CPU load varies between 30 and 80% and the video stutters with 

> Using photojpg instead of mpeg1 works better but why?! And it's 

> When I compare mpeg1 with pjpeg in the Quicktime desktop player, 

> mpeg1 always runs smoother and with 25fps.

my suspicion is that this happens because quicktime for windows is  
such a shitty mpeg-1 playback engine.

>
> hi all
>
> there's sometihing I don't understand about how jitter handles  
> video playback with quicktime. I'm on WinXP.
> when I play a mpeg1 movie without jitter simply with the desktop  
> quicktime player it runs absolutely smooth and with 15% average CPU  
> load.
> when I start the same mpeg1 file in jitter with jit.qt.movie the  
> CPU load varies between 30 and 80% and the video stutters with  
> framerates between 3 and 5 fps!!
> Using photojpg instead of mpeg1 works better but why?! And it's  
> still not 25fps.
> When I compare mpeg1 with pjpeg in the Quicktime desktop player,  
> mpeg1 always runs smoother and with 25fps.
>
> thanks
> secco
>


why is mpeg video playback so slow and cpu intensive?