[mythtv-users] DVB recordings quality problem

Dave dbadia at gmail.com
Thu Oct 5 02:37:59 UTC 2006


Hi Kari,
   I am having a smiliar problem with dvb on kernel 2.6.15.6.  I recently
had to upgrade my kernel for SATA driver support; before the kernel upgrade,
dvb recordings were great.
  Did you ever find a solution?

Thanks!
Dave

On 5/27/06, Kari Salmela <kari.salmela at lanwan.fi> wrote:
>
> Hello
>
> Lately with new builds (<1 month) I have been experiencing problems with
> recording or watching live tv. It seems like signal would be bad, but I
> have checked and double checked the cables and everything should be okay
> on that side. With set top box the signal is flawless. The system is
> only 1-5% CPU load when recording. I have too little memory for the box
> (512MB) currently but I am not sure whether this is the problem since it
> used to work without problems earlier. I will get more RAM hopefully
> soon, and maybe the problem disappears. Meanwhile, is anyone else
> getting this and/or found out a solution? Any ideas how to debug this?
> Sometimes (2-3 out of ten) recordings are ok, but there seems to be no
> common factor when everything works.
>
> The errors in mythbackend.log are like this when recording:
>
> 2006-05-27 22:07:44.439 DVBRec(0): PID 0x28c discontinuity detected
> 2006-05-27 22:07:44.440 DVBRec(0): PID 0x240 discontinuity detected
> 2006-05-27 22:07:44.441 DVBRec(0): PID 0x28a discontinuity detected
> 2006-05-27 22:07:44.442 DVBRec(0): PID 0x28d discontinuity detected
> 2006-05-27 22:07:44.439 DVBRec(1): PID 0x161 discontinuity detected
> 2006-05-27 22:07:44.444 DVBRec(1): PID 0x261 discontinuity detected
> 2006-05-27 22:07:44.445 DVBRec(1): PID 0x361 discontinuity detected
> 2006-05-27 22:07:44.443 DVBRec(0): PID 0x28e discontinuity detected
> 2006-05-27 22:07:44.515 DVBRec(1): PID 0x102 discontinuity detected
> 2006-05-27 22:07:44.534 DVBRec(1): PID 0x103 discontinuity detected
> 2006-05-27 22:07:44.536 DVBRec(1): PID 0x0 discontinuity detected
> 2006-05-27 22:07:44.536 DVBRec(1): PID 0x6b discontinuity detected
> 2006-05-27 22:07:44.663 Writing PAT & PMT @213235804 + 1484448
> 2006-05-27 22:07:44.711 DVBRec(0): Packet dropped due to uncorrectable
> error.
> 2006-05-27 22:07:44.713 DVBRec(0): Packet dropped due to uncorrectable
> error.
> 2006-05-27 22:07:44.714 DVBRec(0): PID 0x200 discontinuity detected
> 2006-05-27 22:07:44.714 DVBRec(0): PID 0x28e discontinuity detected
> 2006-05-27 22:07:44.825 DVBRec(1): PID 0x6e discontinuity detected
> 2006-05-27 22:07:45.001 DVBRec(0): Packet dropped due to uncorrectable
> error.
> 2006-05-27 22:07:45.002 DVBRec(0): PID 0x200 discontinuity detected
> 2006-05-27 22:07:45.003 DVBRec(0): PID 0x28e discontinuity detected
> 2006-05-27 22:07:45.047 DVBRec(0): PID 0x28c discontinuity detected
>
> and when playing the recording, there are dropouts and clicks in the
> sound.
>
> When looking at my dmesg, I see that one dvb card is sharing interrupt
> with ethernet adapter (irq11) and irq5 used by other card is also used
> by usb, but no usb devices are connected to system. Do you think this
> could be the problem? I have moved cards to improve air circulation in
> the box, but made other changes at that time as well.
>
> I also tried hdparm according to suggestions in the mailing list, but it
> don't seem to help.
>
> mythtv:/var/log/mythtv# hdparm /dev/hda
>
> /dev/hda:
> multcount    = 16 (on)
> IO_support   =  3 (32-bit w/sync)
> unmaskirq    =  1 (on)
> using_dma    =  1 (on)
> keepsettings =  0 (off)
> readonly     =  0 (off)
> readahead    = 256 (on)
> geometry     = 24321/255/63, sectors = 390721968, start = 0
>
> Setup:
> M/B Asus A7V266-EX, 512MB RAM, Athlon XP 2400+, NVidia FX5200, Seagate
> S-ATA 160GB
> 2 x Technotrend DVB-C budget cards
> Linux 2.6.15.6 on Debian testing
>
> mythtv:/var/log/mythtv# mythbackend --version
> Library API version: 0.19.20060522-1
> Source code version: 10047
> Options compiled in:
> linux release using_xvmcw using_v4l using_oss using_alsa using_arts
> using_jack using_ivtv using_firewire using_dbox2 using_hdhr using_ip_rec
> using_lirc using_joystick_menu using_dvb using_x11 using_xv using_xrandr
> using_xvmc using_xvmc_vld using_frontend using_backend
>
> Best regards
>
> Kari
>
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