Hi,<br><br>I've been running a mythtv setup for quite a while, but have always<br>had mixed results with the quality of the recordings. I'm using a Nova<br>T-500 dual tuner DVB-t card to record standard SD channels.<br>
<br>The problem I'm seeing is that many recordings have very bad mpeg<br>artifacts, with high pitching noise etc. I've looked at the logs at<br>one of the recordings, and I see a lot of this:<br><br>2009-04-13 19:38:33.494 [mpeg2video @ 0x2b9400cbf6f0]skipped MB in I frame at 29 25<br>
2009-04-13 19:38:33.692 [mpeg2video @ 0x2b9400cbf6f0]skipped MB in I frame at 10 24<br>2009-04-13 19:38:35.469 [mpeg2video @ 0x2b9400cbf6f0]00 motion_type at 10 15<br>2009-04-13 19:38:35.696 [mpeg2video @ 0x2b9400cbf6f0]ac-tex damaged at 43 11<br>
2009-04-13 19:38:35.701 [mpeg2video @ 0x2b9400cbf6f0]ac-tex damaged at 37 13<br>2009-04-13 19:38:35.792 [mpeg2video @ 0x2b9400cbf6f0]00 motion_type at 1 23<br>2009-04-13 19:38:36.696 [mpeg2video @ 0x2b9400cbf6f0]skipped MB in I frame at 6 22<br>
2009-04-13 19:38:41.215 [mpeg2video @ 0x2b9400cbf6f0]skipped MB in I frame at 0 24<br>2009-04-13 19:38:41.337 [mpeg2video @ 0x2b9400cbf6f0]ac-tex damaged at 34 23<br>2009-04-13 19:38:41.416 [mpeg2video @ 0x2b9400cbf6f0]skipped MB in I frame at 24 20<br>
2009-04-13 19:38:41.454 [mpeg2video @ 0x2b9400cbf6f0]invalid mb type in P Frame at 28 13<br>2009-04-13 19:38:41.477 [mpeg2video @ 0x2b9400cbf6f0]00 motion_type at 40 19<br>2009-04-13 19:38:41.495 [mpeg2video @ 0x2b9400cbf6f0]00 motion_type at 43 23<br>
2009-04-13 19:38:41.515 [mpeg2video @ 0x2b9400cbf6f0]ac-tex damaged at 21 18<br>2009-04-13 19:38:41.544 [mpeg2video @ 0x2b9400cbf6f0]00 motion_type at 3 22<br><br><br>So my questions are:<br><br>1) Any idea what's the root cause of this?<br>
2) Is it a signal problem? Sometimes the recordings are flawless,<br> sometimes they are all messed up. I think there may be a<br> correlation with the weather conditions....<br>3) Can it be a hw/os system problem? (I'm running this under Xen<br>
btw). If so, how to diagnose?<br><br><br>Some system info:<br><br>mediaserver2:~# uname -a && cat /etc/debian_version && mythbackend --version<br>Linux mediaserver2 2.6.18-6-xen-amd64 #1 SMP Thu Dec 25 22:21:42 UTC 2008 x86_64 GNU/Linux<br>
4.0<br>Please include all output in bug reports.<br>MythTV Version : Unknown<br>MythTV Branch : tags/release-0-21<br>Library API : 0.21.20080304-1<br>Network Protocol : 40<br>Options compiled in:<br> linux profile using_oss using_alsa using_arts using_jack using_backend using_dbox2 using_dvb using_firewire using_frontend using_hdhomerun using_iptv using_ivtv usioystick_menu using_libfftw3 using_lirc using_opengl_vsync using_v4l using_x11 using_xrandr using_xv using_xvmc using_xvmcw using_xvmc_vld using_bindings_perl using_bngs_python using_opengl using_ffmpeg_threads using_libavc_5_3 using_live<br>
<br><br>mediaserver2:~# cat /etc/modprobe.d/options<br><br>options dvb_usb disable_rc_polling=1<br>options dvb-usb-dib0700 force_lna_activation=1 debug=2<br><br>rgds<br>Jeppe<br><br>