[mythtv-users] dvb-c card fails to tune 1 out of 3 times

Peter Schram mail at peterschram.nl
Sun Sep 17 12:16:41 UTC 2006

On Sun, 2006-09-17 at 14:02 +0200, Thomas Börkel wrote:
> HI!
> Peter Schram wrote:
> > I'm using a dvb-c card of type KNC-one with the Cineview Module and
> > Alphacrypt CAM. (driver is budget-av with tda10021 frontend) The drivers
> > work ok and I get picture and sound. However MythTV 0.19 sometimes fails
> > to tune. This is roughly 1 in 3 times. This makes the system quite
> Hmm, I have the same cards (but withput CI module) and have no problems 
> with tuning in 0.19.

I think the problem is somehow connected to the CI+CAM giving a delay
which Myth cannot cope with. Unfortunately all channels are encrypted on
my cablenetwork, so I need the CI. 

> In 0.20, you can configure a tuning delay, I think.

Setting a delay is also possible with 0.19 but it doesn't solve the
problem. When it fails it gives the following message in frontend

2006-09-17 14:11:34.349 NVP: Prebuffer wait timed out 10 times.
2006-09-17 14:11:34.509
RingBuf(/mnt/store/mythtv/recordings//2512_20060917141128.mpg): Invalid
file (fd 16) when opening
'/mnt/store/mythtv/recordings//2512_20060917141128.mpg'. 2 retries

The buffering to the file hasn't started and is never going to anymore.
I need to find out how to increase the backend logging to find out what
is exactly going wrong.

> What dvb drivers are you using? I am using the ones, that came with 
> kernel 2.6.17.

I'm using kernel 2.6.17, but with experimental dvb-drivers, because the
stock-drivers won't work with the CI+CAM yet. For reference this is my
relevant lsmod output:

tda10021                5316  1
budget_av              16320  0
dvb_pll                11332  1 budget_av
saa7146_vv             38336  1 budget_av
video_buf              17988  1 saa7146_vv
videodev               20928  1 saa7146_vv
v4l1_compat            11460  2 saa7146_vv,videodev
v4l2_common            18432  2 saa7146_vv,videodev
budget_core             7684  1 budget_av
dvb_core               66216  2 budget_av,budget_core
saa7146                13000  3 budget_av,saa7146_vv,budget_core
ttpci_eeprom            1920  1 budget_core

Peter Schram <mail at peterschram.nl>

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