[mythtv-users] Channel scanner won't find a specific channel

Thu Feb 4 19:24:28 UTC 2016

Thanks for all the help so far.

I now have the channel set up in MythTV and can see it, but there's a new
wrinkle.  The stream from this channel (and only this channel) seems
unstable, at least in MythTV.  In both recordings and live TV, the video
shakes slightly and the sound stutters.  The weird thing is, this doesn't
happen when I capture the raw stream and view in in mplayer:

$ dvbv5-zap -c dvb_channel.conf -v -r "WFXV HD"
$ cat /dev/dvb/adapter0/dvr0 > hd_test_1.dat

Viewing hd_test_1.dat in mplayer shows the video and audio are fine.  This
issue seems to be isolated to MythTV, and/or the MPEG-2 compression of the
stream.  But it doesn't happen on any other channels.  Is there something
I'm missing here?

Thanks!

On Thu, Feb 4, 2016 at 2:11 PM, Daryl McDonald <darylangela at gmail.com>
wrote:

>
> On Feb 4, 2016 11:40 AM, "glen" <glenb at glenb.us> wrote:
> >
> >
> >
> > On Feb 4, 2016 8:21 AM, David Parker <parker.david.a at gmail.com> wrote:
> > >
> > >
> > >
> > > On Thu, Feb 4, 2016 at 9:57 AM, Daryl McDonald <darylangela at gmail.com>
> wrote:
> > >>
> > >>
> > >> On Feb 4, 2016 9:43 AM, "David Parker" <parker.david.a at gmail.com>
> wrote:
> > >> >
> > >> > On Thu, Feb 4, 2016 at 9:31 AM, Greg Woods <greg at gregandeva.net>
> wrote:
> > >> >>
> > >> >>
> > >> >> On Thu, Feb 4, 2016 at 6:38 AM, David Parker <
> parker.david.a at gmail.com> wrote:
> > >> >>>
> > >> >>> the HD channel of our local Fox affiliate
> > >> >>
> > >> >>
> > >> >> I seem to remember a previous thread about Fox having all of their
> QAM channels encrypted, even the broadcast network channel. I can't recall
> all the details but a Google search might turn it up.
> > >> >
> > >> >
> > >> > Thanks, Greg.  I don't think it's encrypted, though, unless I'm
> misunderstanding how all of this works.  I'm able to tune the channel just
> fine on my TV, without any sort of set-top box.  Wouldn't that mean it's
> unencrypted?
> > >> >
> > >> >     - Dave
> > >> >
> > >> > _______________________________________________
> > >> > mythtv-users mailing list
> > >> > mythtv-users at mythtv.org
> > >> > http://lists.mythtv.org/mailman/listinfo/mythtv-users
> > >> > http://wiki.mythtv.org/Mailing_List_etiquette
> > >> > MythTV Forums: https://forum.mythtv.org
> > >> >
> > >>
> > >> Have you tried all of the Qam settings, 256 and about four other
> options on the scan page, where you can also limit the range of channel
> numbers to scan? Sometimes the number that shows up, 31-1 is not always the
> number being scanned, and IIRC Qam channel numbers are set by the provider,
> I've seen Fox on 125-945, in Southwestern Ontario
> > >
> > >
> > > Thanks for the pointers.  I added a transport specifically for the
> frequency of this channel (633000000 Hz) and re-ran the channel scan, and
> this time it found it.  It's on channel 115 (not 33_1) but it's there and I
> can record from it.  Success!
> > >
> > > I guess I'm confused about how the channels are numbered, though.  A
> snippet of my channels.conf looks like this:
> > >
> > > [WKTVNBC]
> > > VCHANNEL = 2.1
> > > SERVICE_ID = 157
> > > VIDEO_PID = 121
> > > AUDIO_PID = 122 123
> > > PID_86 = 32
> > > FREQUENCY = 603000000
> > > MODULATION = QAM/256
> > > DELIVERY_SYSTEM = DVBC/ANNEX_B
> > >
> > > [WKTVCBS]
> > > VCHANNEL = 2.2
> > > SERVICE_ID = 279
> > > VIDEO_PID = 131
> > > AUDIO_PID = 132 133
> > > FREQUENCY = 603000000
> > > MODULATION = QAM/256
> > > DELIVERY_SYSTEM = DVBC/ANNEX_B
> > >
> > > [WKTV-CW]
> > > VCHANNEL = 2.3
> > > SERVICE_ID = 287
> > > VIDEO_PID = 111
> > > AUDIO_PID = 112 113
> > > FREQUENCY = 603000000
> > > MODULATION = QAM/256
> > > DELIVERY_SYSTEM = DVBC/ANNEX_B
> > >
> > > [WFXV HD]
> > > VCHANNEL = 33.1
> > > SERVICE_ID = 115
> > > VIDEO_PID = 111
> > > AUDIO_PID = 112 113
> > > FREQUENCY = 633000000
> > > MODULATION = QAM/256
> > > DELIVERY_SYSTEM = DVBC/ANNEX_B
> > >
> > > [WUTR HD]
> > > VCHANNEL = 20.1
> > > SERVICE_ID = 149
> > > VIDEO_PID = 121
> > > AUDIO_PID = 122 123
> > > FREQUENCY = 633000000
> > > MODULATION = QAM/256
> > > DELIVERY_SYSTEM = DVBC/ANNEX_B
> > >
> > > [WCNY HD]
> > > VCHANNEL = 24.1
> > > SERVICE_ID = 217
> > > VIDEO_PID = 121
> > > AUDIO_PID = 122 123
> > > FREQUENCY = 783000000
> > > MODULATION = QAM/256
> > > DELIVERY_SYSTEM = DVBC/ANNEX_B
> > >
> > > [WCNY1 W]
> > > VCHANNEL = 24.2
> > > SERVICE_ID = 218
> > > VIDEO_PID = 131
> > > AUDIO_PID = 132 133
> > > FREQUENCY = 783000000
> > > MODULATION = QAM/256
> > > DELIVERY_SYSTEM = DVBC/ANNEX_B
> > >
> > > The channel numbers in MythTV for almost all of the channels in the
> file correspond to their VCHANNEL values, with two exceptions.  The channel
> numbers for WFXV HD and WUTR HD correspond to their SERVICE_ID values
> instead (WFXV HD being the one I noticed this issue with).  On my TV,
> however, WUTR HD is 20-1 and WFXV HD is 33-1.  So I guess now I'm
> wondering, what's the rhyme or reason as to how these channels get mapped
> to a channel number in MythTV, and why is it different from the one I see
> on my TV?
> > >
> > > And please bear with me if these questions seem obvious.  I've always
> been an analog guy, this is my first ever experience with HD tuning.
> Learning new things every day!
> > >
> > >     - Dave
> >
> > I had same issue with one channel in los Angeles back when time warner
> had unencrypted qam. I used database editor to add manually and it was
> fine. But you have to make sure you get all entries right
> > _______________________________________________
> > mythtv-users mailing list
> > mythtv-users at mythtv.org
> > http://lists.mythtv.org/mailman/listinfo/mythtv-users
> > http://wiki.mythtv.org/Mailing_List_etiquette
> > MythTV Forums: https://forum.mythtv.org
>
> There is no rhyme or reason, just whatever # the provider wants to use. In
> my experience they're temporary too. Mine changed two times on their way to
> encryption. Now I use " the analog hole" for cable and four cards on an
> antenna: free HD
>
> _______________________________________________
> mythtv-users mailing list
> mythtv-users at mythtv.org
> http://lists.mythtv.org/mailman/listinfo/mythtv-users
> http://wiki.mythtv.org/Mailing_List_etiquette
> MythTV Forums: https://forum.mythtv.org
>
>
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