[MPlayer-dev-eng] Re: Make -nortc the default?

[Vladimir Mosgalin]

Hi Corey Hickey!

 On 2006.09.08 at 16:19:16 -0700, Corey Hickey wrote next:

> I cannot detect any difference between -rtc and -nortc. My test 
> methodology is to:
> 
> 1. Use this file:
> http://images.apple.com/movies/us/hd_gallery/gl1800/1080p/bbc-japan_1080p.mov
> 
> 2. mplayer bbc-japan_1080p.mov -rtc
> (observe that mplayer says my system is too slow at "A:  28.1")

Mplayer's cpu statistics doesn't include cpu wasted on rtc. Use top to
measure difference.

> 3. mplayer bbc-japan_1080p.mov -nortc
> (observe exactly the same result)

It's a bit tricky. You see, when mplayer's cpu usage is close to 100%,
looks like it doesn't spend much time using rtc, so the difference
between -rtc and -nortc becomes marginal. In other words, -nortc won't
help you in this case, and you won't notice the difference with
-benchmark too. But with rtc mplayer eats 10-15% of cpu that could be
given to other processes on your system.

> I also tried with -v to make sure mplayer was using the requested timing 
> sources. It was indeed.
> 
> Is there a better way to test this?
> 
> Athlon64 3400+ (a bit overclocked)

I see big difference on similar cpu (A64 @ 2.6Ghz)

> Debian (amd64)
> 2.6.17-beyond1 (ck patchset + misc other stuff)

..though I have 32-bit system and 2.6.16.

-- 

Vladimir