[mythtv-users] Question regarding DVB-S EIT

OJ olejl77 at gmail.com
Wed Dec 10 17:31:33 UTC 2008

2008/12/4 OJ <olejl77 at gmail.com>:
> Hi
> I'm currently using EIT to generate my EPG. The problem is that each
> channel only broadcast NOW and NEXT.
> If I enable 'useonairguide' for all available channels, eventually
> more information is downloaded. As I understand this is because on
> some channels additional information for a week is transmitted.

This was not true. Probably only my imagination :)

> My problem is I don't know which channel this is, so I can not just
> enable this specific channel so the scanning takes a very long time to
> finish.
> If I use my Humax DVB-S tuner I can just click guide and it will give
> me the one week guide. This tells me that there should be a way to
> tell which channel is transmitting AEIT.
> If I watch LiveTV for a long period of time, the EPG data is not
> updated. I would expect the channels on the same transponder (not sure
> about the terminology) to be continously updated.
> Questions:
> 1. How can I tell which channel(s) transmitts AEIT?
> 2. Is there a reason for EPG not beeing updated during LiveTV playback?
> 3. After I exit LiveTV, the EIT scan is not always started. I have to
> restart the backend to get this working again. Anything I can do to
> debug this?
> mythfrontend --version
> Please include all output in bug reports.
> MythTV Version   : 19226
> MythTV Branch    : trunk
> Library API      : 0.22.20081116-1
> Network Protocol : 42
> QT Version       : 4.4.3
> Options compiled in:
>  linux release using_oss using_alsa using_arts using_backend using_dvb
> using_firewire using_frontend using_hdhomerun using_hdpvr using_iptv
> using_ivtv using_joystick_menu using_lirc using_mheg using_qtwebkit
> using_v4l using_x11 using_xrandr using_xv using_xvmc using_xvmc_vld
> using_xvmcw using_bindings_perl using_bindings_python using_opengl
> using_ffmpeg_threads using_libavc_5_3 using_live using_mheg

Since I didn't receive any reponse to these questions, I have done
some investegation and will try to answer some of my own questions.

1. I used 'dvbsnoop' to detect streams that transmitted AEIT. I tuned
to a channel using [szap 'channel name']. Then I used 'dvbsnoop -s
pidscan' to se which streams I had on the different transponders.
2. My second question still stands.
3. There has recently ben some commits regarding this lately so I will
update to trunk and see if there are any improvments.

I'm using Nilesat, and it looks like PID #18 on each (or most of them)
transponder contains 'Aggregate Event Information Table (AEIT)' AEIT
is mentioned here: http://www.mythtv.org/wiki/index.php/EIT.

As far as I can see, this channel/PID is not detected/included as part
of MythTV scan (at least I can't see it in the channel list).

Does anyone know if there are supposed to be any special handling of
AEIT in MythTV?

Anyone know if it is possible to include this stream in the EPG generation?

Could it be a possibility for me to add this channel manually to the database?

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