#9273: DVB-S: Reusing a single "Input source" for multiple LNB connections causes
incorrect DiSEqC commands to be created
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Reporter: Per Lundberg <perlun@…> | Owner: janne
Type: Bug Report | Status: new
Priority: minor | Milestone: unknown
Component: MythTV - DVB | Version: Unspecified
Severity: medium | Keywords:
Ticket locked: 0 |
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Hello,
One thing that caused me quite a lot of headache but eventually was sorted
out was this:
I was trying to set up a DiSEqC-based setup, using one DVB-S card (TBS
8920), a DiSEqC switch and two LNB:s. Scanning for channels worked fine
with both LNB:s, but *tuning* to a channel on the "second" LNB didn't work
for some reason.
Alright, I gave it another try (after deleting the card/resetting the
database or similar). This time, only the *second* LNB worked correctly,
the first LNB didn't work at all. Likewise, scanning for channels worked -
it was only the actual tuning that failed.
The hardware itself was working correctly with other programs (Kaffeine,
hts-tvheadend).
Finally, I managed to locate and find the issue: it had to do with input
sources. You absolutely *must* use one input source per LNB (as indicated
by this web page: http://www.mythtv.org/wiki/DVB-S - the text there has
been slightly clarified by me yesterday, after finally locating the
problem).
If you (like I did) just create one input source for the whole DVB card,
you get this very odd semantic that the scanning works, but tuning only
works for one of your LNB:s.
I consider this a bug in the way MythTV builds up the DiSEqC commands. I
saw the actual error in my backend logs while playing around with this: it
sent the "port 2" command even for channels located on "port 1", when the
input source was the same for both these channels.
Do you agree, can this be considered a bug?
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Ticket URL: <http://svn.mythtv.org/trac/ticket/9273>
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