[mythtv-users] basic ota hdtv questions
steve at clayfish.net
steve at clayfish.net
Thu Dec 22 13:05:27 EST 2005
----- Original Message -----
From: joe byrne [mailto:mythjoe at gmail.com]
Sent: 12/22/2005 3:02:35 AM
To: mythtv-users at mythtv.org
Subject: [mythtv-users] basic ota hdtv questions
> I just installed an air2pc card (the version with the bcm3510) to
> record atsc OTA. It coexists with an ivtv card and a bttv card, which
> both record OTA. Yes, I like variety. I'm running mythtv 18.1
> installed from rpms on FC4 with a 2.6.14 kernel. I'm in the US and
> use zap2it.
I have the same card and recently set it up on a slave backend with FC4 and atrpms according to Jarod's guide.
> I have some really basic questions:
> * Do I need a second zap2it line-up for the ota-hdtv input?
> * Some of the digital channels duplicate analog channels. Is there a
> way to equate the two? E.g., I have an analog channel 7 and a digital
> channel with the same programming.
> * Is there a way to equate zap2it digital channels with the underscore
> (e.g. 7_1) with the channels added by scanning w/o the underscore
> (e.g. 71)?
> * Some of the digital channel numbers duplicate analog channel
> numbers, but carry different programming. E.g., I have a digital
> channel 11 (identified by scanning) and an analog channel 11 that seem
> to be completely unrelated. Will this cause a problem?
It took me awhile to wrap my head around this problem, but this suggestion from the linuxtv list worked for me:
The scanned hdtv channels from mythtvsetup have the tuning information and the zap2it hdtv channels have the program guide info. I would kill the backend before doing this. After matching the scanned channels to the corresponding zap2it channels, I copied serviceid, mplexid, and atscsrcid from the scanned channel to the zap2it channel in the channel table in the database. Instead of
hiding the scanned channels as the post suggests, I just deleted them, leaving the zap2it channels (5_1, 5_2, 17_1, etc.) Be sure to set a starting channel for the card to one that exists in mythtvsetup. I also changed the type for each zap2it channel to atsc in mythtvsetup - channel settings, since I was using a cable type as the default for the global backend setting.
That should leave you with your old analog channels and hdtv channels. I find it is good to have both for the same stations, in case my air2pc card is tied up recording another show I can still record another channel in analog. Myth just treats them as separate channels and knows which card to use.
I also ran into problems on reboot with this card. For lack of a better term, it had to "warm-up" a few minutes before starting the backend service, otherwise it would fail to tune in to the start-up channel, blank out the start-up channel and fail to start again until I ran mythtvsetup and put a start-up channel again. Apparently this is a problem with these first generation air2pc cards.
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