[mythtv-users] Why do I sometimes get no video in LiveTV?

Andrew Junev a-j at a-j.ru
Tue May 20 06:46:07 UTC 2008


Sunday, May 18, 2008, 10:09:04 PM:

> Hello All,

> I have my mythbackend+frontend machine with two DVB-S tuner cards.
> I also have a frontend-only machine (Intel Core2Duo, NVIDIA 8600GT).
> Both machines are running Fedora 8 and MythTV 0.21. The setup worked
> just great for me over the past months. 

> Some time ago I made a 'yum update' on both machines. That's not the
> first time I do it and it used to work fine before. But after some
> time I noticed a strange problem which occurs on my frontend-only
> machine.
> When watching Live TV, I sometimes get no video at all - I can only
> hear the sound. It usually happens like this: I go to Live TV and
> watch a channel for some time, then I try to switch to another DVB
> input and then I get no video (even no OSD), but I can only hear the
> sound. Switching back to DVB_Input_1 does not bring me the video!

> It sometimes happens that LiveTV starts with a blank screen at the
> very beginning (i.e. on DVB_Input_1). I couldn't figure out how I can
> get the picture back. In all cases I can hear the sound, so the tuning
> works fine... This problem appears on frontend-only machine, my
> backend+frontend works good all the time.

> I assume the problem might have appeared when I tried to set 'Sync to
> VBlank' option on my frontend. After checking that option I got no
> video in Live TV for the first time. I unchecked it, but since then
> the no video issue seem to be sporadic.

> I don't know how to trace the problem, so I attached the lof of my
> mythfrontend. It shows a typical situation when I start Live TV, watch
> a channel for a few seconds (the video is there), then I switch the
> DVB Input and I get no video (and no OSD too, the TV is blank).

> Here's my OS and MythTV version:

> # mythfrontend --version
> Please include all output in bug reports.
> MythTV Version   : 17180M
> MythTV Branch    : branches/release-0-21-fixes
> Library API      : 0.21.20080304-1
> Network Protocol : 40
> Options compiled in:
>  linux release using_oss using_alsa using_arts using_jack
> using_backend using_dbox2 using_dvb using_firewire using_frontend
> using_hdhomerun using_iptv using_ivtv using_joystick_menu
> using_libfftw3 using_lirc using_opengl_vsync using_opengl_video
> using_v4l using_x11 using_xrandr using_xv using_xvmc using_xvmcw
> using_xvmc_vld using_glx_proc_addr_arb using_bindings_perl
> using_bindings_python using_opengl using_ffmpeg_threads
> using_libavc_5_3 using_live
> # uname -a
> Linux frontend1 2.6.24.5-85.fc8 #1 SMP Sat Apr 19 12:39:34 EDT 2008 i686 i686 i386 GNU/Linux

> I was using an NVIDIA 169.12 driver and recently updated to 173.08
> (beta) driver. But it didn't change the behavior...

> I appreciate any ideas on how to trace / fix the problem.


Any ideas? Anyone?
I can't watch half of my channels on the big screen now... :-(


-- 
Best regards,
 Andrew




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