[mythtv-users] Issue exiting to main menu and extremely high cpu usage for the frontend

Matthew Anderson muss3000 at gmail.com
Mon Jan 3 07:35:13 UTC 2011

Hi All,

I took your advice (Thanks Jean-Yves Avenard) and downloaded and installed
mythtv (fixes/0.24) using git and this seems to have resolved my ability to
watch tv without it freezing however I am having troubles no when I exit
from a channel to the main menu or occasionally when I switch channels. I
look at the console running the mythfrontend in the background and I still
see something similar to what I saw with my initial issue of it just locking
up. See below: -

2011-01-03 17:30:48.816 Player(0): Waited 100ms for video buffers
2011-01-03 17:31:10.920 Player(0): Waited 100ms for video buffers
2011-01-03 17:31:33.024 Player(0): Waited 100ms for video buffers
2011-01-03 17:31:42.389 TV: Attempting to change from WatchingLiveTV to None

Has anyone seen this? Am I missing a particular config?

This is the version that I checked out: -

matt at mythbackend-test:/root$ mythfrontend --version
Please attach all output as a file in bug reports.
MythTV Version   : v0.24-97-g3ec48f2
MythTV Branch    : fixes/0.24
Network Protocol : 63
Library API      : 0.24.20101129-1
QT Version       : 4.7.0
Options compiled in:
 linux release using_alsa using_jack using_oss using_pulse using_pulseoutput
using_backend using_bindings_perl using_bindings_python using_dvb
using_frontend using_hdhomerun using_hdpvr using_iptv using_ivtv
using_joystick_menu using_lirc using_mheg using_opengl_video
using_opengl_vsync using_qtdbus using_qtwebkit using_v4l using_x11
using_xrandr using_xv using_bindings_perl using_bindings_python
using_mythtranscode using_opengl using_ffmpeg_threads using_live using_mheg

Issue 2: -

I have noticed something I have not seen before where the mythfrontend is
taking up 100% CPU usage. With my setup I have a backend PC (I7 Quad Core,
4Gb Ram) to do all the recordings and I have smaller PC (single core
1.73Ghz) to do the play back only. Now when I am watching tv on the frontend
it seems its taking up 100% of the cpu (no io) and the playback isn't that
crisp anymore. I thought the frontend was lightweight and effectively
rendered the recordings/stream sent via the backend? Is there some sort of
config that will help alleviate this issue?

*Note - this didn't occur in my previous version which was 0.21

This is the output from top (when watching tv): -
 8101 matt      20   0  432m 107m  49m R 94.8 22.0   8:23.51 mythfrontend
  978 root      20   0 82344  31m  25m S  1.9  6.5   5:16.78 Xorg
    1 root      20   0  3288  720  452 S  0.0  0.1   0:00.95 init

This is the output from iostat (when watching tv): -
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          82.59    0.00   17.41    0.00    0.00    0.00

Thanks again for reading this and hopefully someone can point me in the
right direction

With Regards,
Matt Anderson

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