[mythtv-users] Channel scan on both tuners (hybrid system) not possible? (setup)
A. F. Cano
afc at shibaya.lonestar.org
Mon Jan 19 06:16:36 UTC 2009
Please be patient, I'm slowly getting there...
This applies to the OnAir Creator, accessed through the pvrusb2 driver,
although I suspect other cards or usb devices with hybrid tuners should
work the same, and mythtv 0.20-svn20 that comes with Debian Lenny.
This usb device has a hybrid tuner (analog and digital) with parts in
common, so it's not possible to use both at the same time. It also has
a composite input and an S-video input (as well as a hardware encoder).
In mythtv-setup I set it up as an mpeg 2 device (/dev/video0) based on
reports I found of configuring a Hauppauge device which is apparently
very similar (it uses the same firmware). The 3 inputs are correctly
recognized: television, composite and S-video. When configuring the
video source television, I tell it to use the EIT scan on us-bcast
When going to input connections, the 3 video sources are there, so
I associate input Television to the video source Television. A
channel scan at this point only scans (apparently) the analog channels.
In the next screen, I set up two input groups, which is, I gather,
mythtv's way of dealing with the two tuners: HDTV and Analog.
So far so good, but there doesn't seem to be a way to do a digital
channel scan. What am I missing?
Of course, in mythfrontend, I can only watch the analog channels.
How can I switch to the digital tuner? I have found that 'c' changes
the input, so I can go from 'television' to 'composite' (I have connected
a camera to the composite input), but I get a blank screen on 'composite'.
The same camera connected to the tv or vcr works just fine.
I have tried all kinds of combinations: as 2 capture cards, but then
there are 2 composite inputs and 2 s-video inputs, which is clearly
not the case; manually putting in the /sys/adapter0/* devices supplied
by pvrusb2 - mythtv-setup didn't like that at all; as a DVB-DTV card -
but then I can't get to the analog part and trying to watch tv with this
setup I can't get a signal lock on any of the ATSC channels the scan found.
The channel scan locks but says "no tables". I presume this has to do
with the lack of channel information in the database? In any case, if
the scan detected a channel, shouldn't it be viewable in the frontend?
Is DVB DTV card the proper setting for this device? What am I missing?
Any hints or (especially!) experience with this device (am I the only
one usint it?) would be greatly appreciated.
PS: Before flaming me for not doing my homework, consider that I've spent
the better part of 2 days reading docs and doing google searches. Most
of what I found is about 2 years old and not one thing applies directly
to this device. The low level setup seems to work: the pvrusb2 creates
the device files, the firware gets loaded, mythtv connects to the backend
and the database configuration seems to be correct.
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