<div class="gmail_quote">On Sat, Jun 4, 2011 at 10:38 AM, Michael T. Dean <span dir="ltr"><<a href="mailto:mtdean@thirdcontact.com">mtdean@thirdcontact.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
On 06/04/2011 10:24 AM, Jerry Rubinow wrote:<br>
<div><div></div><div class="h5">> On Sat, Jun 4, 2011 at 10:16 AM, Michael T. Dean wrote:<br>
>> On 06/04/2011 10:06 AM, Jerry Rubinow wrote:<br>
>>> Myth suddenly started tuning to the wrong frequencies for my<br>
>>> HDHomerun. I wanted to tweak just the few channels I get through the<br>
>>> HDHR, and I was unable to determine how it gets from the channel entry<br>
>>> in the "channel" table in the DB to the frequency it uses in the<br>
>>> channelscan_dtv_multiplex table.<br>
>>><br>
>>> One channel in the channel table, for example, has a mplexid of 101<br>
>>> and a serviceid of 1143. I look up the entry<br>
>>> in channelscan_dtv_multiplex with a transportid of 101. This has a<br>
>>> frequency of 645000000. However, this is not what I see in the<br>
>>> logfile that myth is tuning to - 513000000.<br>
>> For digital channels, MythTV uses a starting frequency, then uses the<br>
>> information specified by tables in the digital stream you receive on<br>
>> that frequency. If your frequencies have changed for a digital source,<br>
>> you really need to rescan.<br>
> I expect frequency reassignments by the provider are the only thing this<br>
> could be, since I haven't modified my system recently.<br>
><br>
> Is it advisable to first clear the existing tables somehow?<br>
> My channelscan_dtv_multiplex has over 300 entries in it, and my<br>
> channelscan_channel table has over 2500. I should mention my system just<br>
> has an HDHR and a HD-PVR.<br>
<br>
</div></div>MythTV will take care of that for you. However, I tend to like to<br>
always start channel setup from a known location--completely clean<br>
setup. So, for that, I do the video sources portion of<br>
<a href="http://www.gossamer-threads.com/lists/mythtv/users/264034#264034" target="_blank">http://www.gossamer-threads.com/lists/mythtv/users/264034#264034</a> .<br></blockquote><div><br></div><div>Thanks Mike, that's what I needed to know. </div>
<div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<br>
Also, I highly recommend anyone who messes with MythTV configuration<br>
back up the DB, first. Because if you don't remember how to do the<br>
scanning/configure xmltvids/set up channels/whatever or you make a<br>
mistake or MythTV crashes on you or whatever, you could then always<br>
restore the old DB and be no worse off than you are now.<br>
<br>
<a href="http://www.mythtv.org/wiki/Database_Backup_and_Restore" target="_blank">http://www.mythtv.org/wiki/Database_Backup_and_Restore</a></blockquote><div><br></div><div>Always.</div><div><br></div><div>-Jerry</div></div>