[mythtv] Ticket #2830: ATSC QAM256 scan in mythtv-setup returns no channels.

[R. G. Newbury]

Daniel Kristjansson wrote:
> On Tue, 2007-01-02 at 15:20 -0500, R. G. Newbury wrote:
>> Daniel Kristjansson wrote:
>>> On Tue, 2006-12-26 at 19:36 -0500, R. G. Newbury wrote:
>>>> MythTV wrote:
>>>>> #2830: ATSC QAM256 scan in mythtv-setup returns no channels.
>>>> Sorry, I could not post with the log attached as it is too big for Trac. 
>>>> I attempted a posting, and it has been held for the moderator to 
>>>> approve. If you know who that is, you may be able to influence that 
>>>> decision. I also attempted a direct post to you, with the log attached 
>>>> (outside TRAC).
>> Hope you had a good Christmas/New Year's break. In the meantime, I fuond 
>> that clearing the 'Unencrypted Channels Only' flag allowed a channel 
>> scan to complete...at the cost of adding all 454 streams to the channel 
>> list!.
> Yikes! Well as I said in the e-mail I sent a couple hours ago it looks
> like the problem is that your cable operator is marking your unencrypted
> channels as if they were encrypted, so this makes sense.

Yeaah, real boring checking channels... and annoyingly difficult to 
delete them within the system. I guess no-one ever considered that 
someone would have to delete over 400 channels! Luckily(?) since the 
scan thought they were ATSC...the channel numeration showed them as 
84#1, 84#2 etc..so I was able to test whole groups on the same multiplex 
and then delete in a mysql console 8 or 10 at a time.

The Channel Editor really needs a 'Delete button'.. Now that i know 
where to look I will see what I can do about adding one to that 
Screen..and one which clears the existing data...as just filling in one 
item does not do it..

>> I (attempted) to take a look at the code, but I cannot figure out where 
>> things are...I found the top-level case statement which includes a 
>> reference to the 'VideoSourceEditor' function, but I cannot find that 
>> anywhere...A full grep of the source produces no hits, nor on 
>> 'vse'...How does this stuff work!..
> VideoSourceEditor is defined in videosource.h, it turned up in my grep:
> grep VideoSourceEditor libs/*/*.{cpp,h}

Ahh, I must have missed checking the libs folder....

>> Now that I have my system working, the pressure is off a little, but I 
>> still want to help track this down. As noted, I have had 2 different and 
>> separate reports of this error. Both North American so I may be related 
>> to the cable versus OTA divide..
> It's more of a cable operator screwing with their customers
> kind of thing. But I need to write a A/V stream detector
> anyway for the FireWire signal monitor since my SA 4200HD
> sometimes rewrites PMTs incorrectly, this should fix the
> problem with your cable operator as a side effect..

I have sent an email to one of the people who contacted me. He is 
somewhere here in Canada too... email is a '.ca' Maybe he has some 
different info which can help define what went wrong. Not that that can 
always help fix it, but it is nice to know. The 'Unencrypted' flag 
workaround is from him.

What is kinda interesting is that there are peculiar changes in the 
tables when the scan goes bad. There was no dstv_multiplex table or 
channel entreis, but I was unable to recreate those tables from my old 
info. I think the cardinput and capturecard tables were also altered.

I have posted working records from those tables on the wiki but we 
really need similar entries for OTA tuning etc. in order to see where 
things differ.

Geoff