Difference between revisions of "DVB-T"

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(Re-started (will come back once I wake up a bit).)
(Added some information to Tuning.)
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There are 2 options to ease this process:
 
There are 2 options to ease this process:
  
# Add the channels manually to the MythTV database.  There are [[Channel_table | 2 tables]] to update with this method, dtv_multiplex and channel.  Even if you are comfortable with the SQL to do this, and you will likely have to guess at some of the values.
+
# Add the channels manually to the MythTV database.  There are [[Channel_table | 2 tables]] to update with this method, dtv_multiplex and channel.  Even if you are comfortable with the SQL to do this, and you will likely have to guess at some of the values.  Furthermore, you are entering possibly dirty values (that you guessed at) into your database, and it might be wise to remove these rows in the future once you have your antenna in the ideal position, so that you can get the values that mythtv thinks you should use.
 
# Use Kaffeine.  This involves hacking up the ~/.kde/share/apps/kaffeine/channels.conf:
 
# Use Kaffeine.  This involves hacking up the ~/.kde/share/apps/kaffeine/channels.conf:
## Start by running something like<PRE>scan -A 1 -d 0 -t 1 /usr/share/dvb/atsc/us-ATSC-center-frequencies-8VSB</PRE> (for ATSC DVB-T), and copying the returned values into the file.
+
## Start by running something like<PRE>scan -A 1 -d 0 -t 1 /usr/share/dvb/atsc/us-ATSC-center-frequencies-8VSB</PRE> (for ATSC DVB-T), and copying the returned values into the file.  Hopefully you have some resource that will inform you of what channels are a possibility (for me here in Ottawa, I was lucky enough to find [http://www.remotecentral.com/hdtv/ottawa_hdtv.htm this site].  Once you've identified the channels, use [http://en.wikipedia.org/wiki/North_American_broadcast_television_frequencies wikipedia] to determine the frequencies.

Revision as of 00:58, 12 December 2009

Introduction

For an introduction, read User_Manual:DVB.

Tuning

Tuning DVB-T can be very challenging. Using MythTVSetup, you may notice channels being detected, but too weak for MythTV to identify and record in its database. This does not mean that it is impossible to pick-up the channel, you may just need to change the direction your antenna faces. Doing this with repeated MythTV scans is not a pleasant option as it takes so long to scan for channels.

There are 2 options to ease this process:

  1. Add the channels manually to the MythTV database. There are 2 tables to update with this method, dtv_multiplex and channel. Even if you are comfortable with the SQL to do this, and you will likely have to guess at some of the values. Furthermore, you are entering possibly dirty values (that you guessed at) into your database, and it might be wise to remove these rows in the future once you have your antenna in the ideal position, so that you can get the values that mythtv thinks you should use.
  2. Use Kaffeine. This involves hacking up the ~/.kde/share/apps/kaffeine/channels.conf:
    1. Start by running something like
      scan -A 1 -d 0 -t 1 /usr/share/dvb/atsc/us-ATSC-center-frequencies-8VSB
      (for ATSC DVB-T), and copying the returned values into the file. Hopefully you have some resource that will inform you of what channels are a possibility (for me here in Ottawa, I was lucky enough to find this site. Once you've identified the channels, use wikipedia to determine the frequencies.