[mythtv-users] Zero Byte Recordings

Daryl McDonald darylangela at gmail.com
Tue Sep 16 20:54:20 UTC 2014


On Tue, Sep 16, 2014 at 4:41 PM, Andrew Potter <andrew at potter.id.au> wrote:

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> *From:* mythtv-users-bounces at mythtv.org [mailto:
> mythtv-users-bounces at mythtv.org] *On Behalf Of *Andrew Potter
> *Sent:* Monday, 15 September 2014 11:45 PM
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> *To:* 'Discussion about MythTV'
> *Subject:* Re: [mythtv-users] Zero Byte Recordings
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> *From:* mythtv-users-bounces at mythtv.org [
> mailto:mythtv-users-bounces at mythtv.org <mythtv-users-bounces at mythtv.org>] *On
> Behalf Of *David Watkins
> *Sent:* Monday, 15 September 2014 11:31 PM
> *To:* Discussion about MythTV
> *Subject:* Re: [mythtv-users] Zero Byte Recordings
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> On 15 September 2014 14:03, Andrew Potter <andrew at potter.id.au> wrote:
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> -----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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> David ,
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> YES DVB-T.
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> Will check those tomorrow.
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> Andrew
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> The zero byte recordings have now disappeared.
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> I updated the bios on the motherboard and now when I shutdown the Tuners
> are no longer receiving power, so coming up from a cold state rather than
> warm. Big problem with this is now the Wake On LAN no longer works.
>
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> I also changed the tuning delays so not 100 % sure on which change fixed
> it. Am pretty sure it is the power issue though.
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> Will changed the EUP setting to keep the tuners in warm state and if zero
> byte recording come back I will then be certain.
>
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>
> Does any body have a method of forcing these tuners to appear to be cold
> booted? I mean can they be removed and reinstalled using a modprobe or
> something similar that will make them work when warm booted?
>
>
>
> Andrew
>
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>
Could it be that updating the BIOS reset the defaults so WOL no longer
works?
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