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

Nick Tan nick at wehi.edu.au
Thu Jun 16 22:13:24 UTC 2005

Hi Barry,

I've been using TS mode for over a week now and haven't had the 
problems I was originally describing with PS mode.  So I guess for me, 
the solution was to go to TS mode, which is not an option for you 

I'm also in Australia, so maybe what I was seeing was exactly as you 
described, when a glitch in the stream occurs it switches audio tracks, 
which happens to be empty.

Sorry I couldn't be more helpful, but I thought you might want to know 
if TS mode helped anyway.


On 11/06/2005, at 9:08 AM, Barry Hee wrote:

> 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
> shows.
> 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.
> Thanks,
> Barry.
> 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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