[Mplayer-cvslog] CVS: main/DOCS documentation.html,1.268,1.269

[Attila Kinali]

On Sat, 29 Jun 2002 04:43:30 +0200
Diego Biurrun CVS <diego at mplayerhq.hu> wrote:

> +<LI>There are three timing methods in <B>MPlayer</B>.
> +  <UL>
> +    <LI><B>To use the old method</B>, you don't have to do anything. It uses
> +      <CODE>usleep()</CODE> to tune A/V sync, with +/- 10ms accuracy. However
> +      sometimes the sync has to be tuned even finer.</LI>
> +    <LI><B>The new timer</B> code uses PC's RTC (Real Time Clock) for this task,
> +      because it has precise 1ms timers. This requires root privileges, or a
> +      <I>setuid root</I> <B>MPlayer</B> binary. If you are running kernel
> +      2.4.19pre8 or later you can adjust the maximum RTC frequency for normal
> +      users through the <CODE>/proc</CODE> filesystem. Use this command to enable
> +      RTC for normal users:
> +      <P>
> +      <CODE>echo 1025 > /proc/sys/dev/rtc/max-user-freq</CODE>
> +      </P>
> +      If you do not have such a new kernel, you can also change one line in
> +      <CODE>drivers/char/rtc.c</CODE> and recompile your kernel. Find the line
> +      <P>
> +      <CODE>if ((rtc_freq > 64) && (!capable(CAP_SYS_RESOURCE)))</CODE>
> +      </P>
> +      and change the 64 to 1024. You should really know what you are doing, though.
> +      <BR>
> +      You can see the new timer's efficiency in the status line. In some hardware
> +      combinations (confirmed during usage of non-DMA DVD drive on an ALi1541 board)
> +      usage of the RTC timer causes skippy playback. It's recommended to use the
> +      following method in these cases.</LI>
> +    <LI><B>The third timer code</B> is turned on with the <CODE>-softsleep</CODE>
> +      option. It has the efficiency of the RTC, but it doesn't use RTC. On the other
> +      hand, it requires more CPU.</LI>
> +  </UL>
> +</LI>
> +</UL>

There should be also stated that RTC is automagicaly used when available and that it
can cause problems on laptops with speedstep (see also FAQ)


>  Note: <B>NEVER install setuid MPlayer binary on a

Shouldnt this be "setuid root" ? I mean setuid nobody doesnt harm anyone :)

		Attila Kinali

-- 
Israel, where the first genocide of this century takes place.