[mythtv-users] Zero Byte Recordings

[David Watkins]

On 15 September 2014 14:03, Andrew Potter <andrew at potter.id.au> wrote:

>
>
> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org
> [mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Mark Perkins
> Sent: Monday, 15 September 2014 10:26 PM
> To: Discussion about MythTV
> Subject: Re: [mythtv-users] Zero Byte Recordings
>
> Have you tried going to LiveTV then manually changing to one of your
> recording tuners (press m, source, switch input, then select tuner 1). Then
> check each channel one at a time (channel up / down) and check that you can
> see all these channels with LiveTV and your recording tuners (as opposed to
> your LiveTV tuner which is the least likely to get used for recordings).
>
> What region are you in? Have you gone to http://retune.digitalready.gov.au
> to check whether you are affected by the channel restack? I don't suppose
> you are eastern South Australia or maybe Murrumbidgee / Upper Murray given
> your channel numbering, there have been various changes scheduled around
> June / July / August which might align with your problems? You might need
> to
> rescan to pick up changes in frequencies.
>
> I'm just guessing here.
> ____________________________
>
> Mark,
>
> Thanks for replying.
>
> OK tried changing the channels as you suggested and I thought you had
> nailed
> it. I was unable try to access the back-end setup and fix it right away as
> some waf recordings are happening (that are working). They are not
> scheduled
> to finish for an hour or two.
>
> There is one recording that is currently showing as zero bytes (still
> showing as recording though) using tuner number 1. I changed the current
> input to that adapter and there was nothing visible, just a black screen.
> As
> it was recording it would not allow me to change the channel. So I stopped
> the recording (it wasn't working anyway). Then retuned to that tuner. It
> started on abc and was displaying a picture correctly. Changed to all the
> other channels also, i.e. Prime, Win and Southern Cross. All displayed
> picture and audio fine, so now I am baffled. It appears that the tuner
> sometimes does not tune correctly.
>
> I think I need to read up on unloading the tuners before shutting down to
> try and get away from the warm start issues.
>
> I'm assuming your source is DVB-T?

There were some adjustable tuning delay parameters in the card setup
section of mythtv-setup which I had to increase a while ago to get reliable
recordings from one of my DVB cards, though I can't remember if the symptom
was zero-byte recordings or just failed recordings.
It's possible that when your box is cooler the cards take longer to get a
lock? It's a pure guess - but it wouldn't do any harm to tweak the defaults
up a bit.
(WARNING. I'm not running the latest MythTV version - these settings may
have disappeared now)
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