On Saturday 07 May 2005 13:25, Jesper Mathiassen wrote:
> Thorsten Pferdek�mper wrote:
> >Hi,
> >whenever I watch a video while my freevo box is recording something, the
> > video appears rather choppy. This would be ok for me if top told me that
> > there is no idle time left, but there is about 20% idle all the time. I
> > [...]
>
> The only sollution I've found is a compromise and give both applications
> a farily low nice value. I used -10 for a period, however you should be
> confident that you have sufficient resources (i.e. at least 20% spare
> cpu time when recording/playing) and accept that although better,
Yes, but I just wonder why the system is dropping frames even if there is 20%
spare CPU all the time? I do not really believe that the CPU is the
bottleneck. At least not in my system (2.8GHz Pentium-something).
It also seems that while having mplayer the higher prio, the system really
consumes up to 100% CPU, but frames get lost in recording while watching is
smooth. The other way (i.e. mencoder has higher prio) the recording does not
seem to lose frames, but watching is choppy. The CPU never goes up to 100%.
(It even stays below 80% most of the time.)
> sometimes frames will drop anyway (so dont use mplayer while recording
> anything important... )
Yes I tried this. But it did not really work. I have implemented a slightly
modified system of favorite handling, so I mostly do not really know what the
system does. In fact, I could look this up before watching something, but I
do not really want to.
What I would like: The recording process should take as much system ressources
as it needs to produce a nice video. All the spare ressources shall go into
watching. It does not really matter for me if I do not see really all the
frames while watching. But it matters if I do not understand why it seems not
to use all the system ressources.
> oh.. and last sollution would be to get an ivtv based capture card.
> since they do encoding in hardware, the cpu is left largly untouched...
> (1-2% on my 700Mhz Athlon recording 720x576 mpeg2.. )
Yes, this would probably change the behaviour. I am going to move in a few
months and I am planning to have DVB. I believe that it should be possible to
have these streams on the disk with evenly low CPU...
I am even thinking about using my second freevo box only as a recording
server, this also should do the task.
But my question resides: Where is the bottleneck in my system?
Regards,
Thorsten
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