[mythtv] Channel scanner doesn't always detect callsigns and sometimes misses channels

Michael T. Dean mtdean at thirdcontact.com
Sat Jan 19 19:08:33 UTC 2008


On 01/19/2008 09:00 AM, Ronald Frazier wrote:
> Over the last couple months I've run the channel scanner a number of
> times against my HD Homerun, which is hooked up to cable (QAM 256).
> Occasionally it will come up with the correct info (channel 1008.203,
> callsign NBCHD). However, most of the time it just seems to come up
> with the multicast info (ex 102#2 ) with no channel number or
> callsign.
>
> If I do a channel scan using the hdhomerun_config utility from the
> command line, it correctly picks up the channel numbers and callsigns.
> SCANNING: 663000000 (us-cable:102, us-irc:102)
> LOCK: qam256 (ss=90 snq=93 seq=100)
> PROGRAM: 203: 1008.203 NBCHD
> PROGRAM: 204: 1008.204 KBDDT
> PROGRAM: 362: 0.0 (encrypted)
>
> In addition, I've also noticed that when it does correctly detect the
> channel number and callsign, the scanner also seems to pick up all of
> my cable provider's Music Choice channels (48 channels of music, no
> video, all on the same multicast). However, when it doesn't get the
> correct channel numbers and callsigns, the Music Choice channels don't
> get picked up by the scan. Not that I care...I'd just delete them
> anyway...but I thought it was worth pointing out.
>
> My questions are:
> 1) is there something I'm doing wrong, or does this appear to be a
> bug? If it's a bug...
>
> 2) what is the status of the channel scanner right now...is there any
> significant work being done on it, or is it in a pretty stable
> condition? If it's stable, then...
>
> 3) I wouldn't mind trying to tackle this problem if nobody else is
> already working on it. Any pointers on where to start looking (files
> or functions) or specific tools/command to help debug it?
>
> 4) Finally, while we're on the topic, can anyone explain why the
> channel numbers come in as 1008.203 instead of just 203? 203 is the
> official channel number listed by my cable provider, and it's also
> what my HDTV comes up with when it does a scan. I need to manually
> strip off the 1008. before it will match the channel to the guide
> data. Is there any reason the channel scanner can't strip this off
> automatically? That would certainly make the results more user
> friendly.

http://www.gossamer-threads.com/lists/mythtv/users/309882#309882 (second 
paragraph, especially).

Mike


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