[mythtv-users] Mythpreviewgen

Josu Lazkano josu.lazkano at gmail.com
Tue Sep 20 08:37:23 UTC 2011

2011/9/20 Michael T. Dean <mtdean at thirdcontact.com>:
> On 09/19/2011 04:56 PM, Josu Lazkano wrote:
>> Hello to all, I write lots of post this last few days, I am trying to
>> get a stable system, I am getting lots of playback pauses from time. I
>> have two Nvidia ION boards with same problems, I started all these
>> post trying to fix my problem:
>> http://www.gossamer-threads.com/lists/engine?list=mythtv;do=search_results;search_forum=forum_1;search_string=josu%20lazkano;search_type=AND&sb=post_time
>> I am watching LiveTV with a "htop" terminal and I just hunt a process
>> with high CPU on the playback stops, is the /usr/bin/mythpreviewgen.
>> It is correlated with the stops, it happens 3 more time.
>> I got a screenshot: http://dl.dropbox.com/u/1541853/mythpreviewgen.png
>> There are 2 mythpreviewgen process with 27% and 17% CPU usage. Could
>> it be this the cause of my playback stops? I read the wiki page about
>> the Mythpreviewgen (http://www.mythtv.org/wiki/Mythpreviewgen), but
>> there is no much info about it.
>> Could I limit the CPU usage for this process? I would appreciate any
>> help, I hope this will fix all my problems.
>> Thanks for all help, best regards.
> mythpreviewgen (and possibly some other "start/end of recordings"
> activities) are definitely the cause of the "short playback pauses at
> program transition".  It's possible mythpreviewgen could cause similar
> pauses at other times if something kicks it off (like someone
> setting/clearing a bookmark on a recording on another frontend while
> you're watching a recording on yours).
> Doesn't look like there's any code in mythpreviewgen to set a nice
> value.  You could stick a myth_nice(17); somewhere in there and see if
> it helps.
> Mike
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Thanks Mike, sorry but I don't know where to add the "myth_nice(17);".

Is possible to disable this function? I never try it, but there is a
cpulimit software to limit the CPU usage of a process, could be a good

Thanks and best regards.

I want to try

Josu Lazkano

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