[mythtv-users] Re: DVB-T problems with sound

Barry Hee barryhee at gmail.com
Fri Jun 10 23:08:06 UTC 2005

Hi Nick, I have the same problems to you, albeit occassionally and for
some reason late at night. I record using PS mode because I view all
recordings through my Pinnacle Showcenter, so TS mode is not an
option. During PS recordings all audio tracks are recorded I believe
so sometimes it's possible to switch audio tracks as discussed here.
Unfortunately for me  some channels in Australia i.e. Channel 7 in
Sydney one audio channel is silent hence when a glitch happens the
primary audio disappears and I don't get anything at all.

My wife loves Myth and now can't live without it but this one problem
is causing some heartaches especiallly when its one of her favourite

I am in the process of rewiring my antenna using quad RG6 and amps
hoping to get much better (>75%) signal strength according to Myth
scans and testing the latest CVS.

Anyone know if this is still a problem in the current CVS and what I
can expect if I do the rewiring? Nick if you find a solution like to
hear from you.


On 6/10/05, Nick Tan <nick at wehi.edu.au> wrote: 
> Hi All, 
> I have a Pentium 4 celeron 2.4Ghz system with 512mb ram running Fedora 3 
> and Myth 0.18.1. I have a PVR-250MCE recording via s-video from an 
> external cable tuner, and a KWorld V-Stream Xpert DVB-T connected to an 
> external antenna (via a signal booster) recording terrestrial digital 
> channels. I'm running a custom compiled kernel patched with 
> drivers from video4linux. TV-out is via svideo from an Nvidia 5200, and 
> audio is using a SBLive value through the digital output to an amplifier. 
> Its all working great except for one thing. On the DVB recordings, on 
> occasion the picture and sound will break up for a second at the most, and 
> then it'll continue on as normal. I'm guessing its just errors in the 
> signal, or a low signal strength. However, on a few occasions the picture 
> will come back but the audio disappears. 
> I don't see any errors in the logs, so I'm wondering if anyone else has 
> seen this problem and if there's a resolution for it. 
> This is an example of a capture log from mythbackend, from yesterday's 
> showing of Dr Phil: 
> 2005-06-09 11:58:01.946 Started recording "Dr. Phil" on channel: 2018 on 
> cardid: 
> 2, sourceid 2 
> 2005-06-09 11:58:02.461 DVB#0 DVB signal 13c4 | snr c6c6 | ber 0 | unc 
> ffff 
> 2005-06-09 11:58:02.492 DVB#0 Status: LOCK. 
> 2005-06-09 11:58:02.493 DVB#0 Multiplex Locked 
> 2005-06-09 11:58:03.605 DVB#0 Successfully tuned to channel 900. 
> 2005-06-09 11:58:03.705 Changing from None to RecordingOnly 
> 2005-06-09 11:58:03.814 DVB#0 Recorder: Card opened successfully (using PS 
> mode) 
> . 
> 2005-06-09 11:58:03.823 DVB#0 Data read from DMX - This is for debugging 
> with tr 
> ansform.c 
> 2005-06-09 13:07:00.002 Finished recording Dr. Phil on channel: 2018 
> The DVB kernel modules I'm using are cx88xx, cx8800, cx8802 and cx88-dvb 
> Thanks, 
> Nick 
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