[mythtv] MythTV woes....

Debabrata Banerjee davatar at comcast.net
Sun Dec 12 17:51:21 UTC 2010

MythTV for some reason checks these tables when recording and playing back, 
however they are mostly unnecessary. Mplayer will play back every stream I 
can grab from my RNG110 STB, sometimes with a few complaints, but it still 
works perfectly. I don't know if the streams are technically non-compliant 
(with what?) but it doesn't matter if I can't "watch TV". I updated some of 
the wiki's to reflect this information at least.

There's currently no patch that works very well. I have all records and some 
playbacks working, but it's not really in a useable or submit-able state. 
Regenerating the PMT/PAT on record let's mythbackend at least record the 
stream, but it often gets screwed up on decoding, including mythpreviewgen. 
Mplayer can still play those files though. The patch itself is a hack, 
MythTV needs an option just to ignore this information. I don't really have 
time to work on it though.

For your last question - if you can grab video with test-mpeg2 or some other 
application, but LiveTV will not get a "signal lock", then it's likely you 
don't have valid tables.

-----Original Message----- 
From: John Gelnaw
Sent: Wednesday, December 01, 2010 1:57 PM
To: davatar at comcast.net
Subject: MythTV woes....

I apologize for contacting you out of nowhere, but it appears you
might know a solution to a problem I'm having.

My cable company recently upgraded my STB, and while it still streams
via firewire, MythTV (0.23 and 0.24) refuse to record, and I wind up
with 0 byte files.

Two questions...

1)  You mentioned a patch to rebuild the PAT/PMT tables-- where is
this patch?  I'd be interested in trying it myself.

2)  How can I determine if the stream has valid PAT/PMT packets?  I
can spell PAT and PMT, and vaguely know what they are-- after that,
I'm a bit lost.

I'd greatly appreciate any information you can offer...


John Gelnaw <jgelnaw at gmail.com> 

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