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Mysterious missing MUXes

Added by Richard McBride over 11 years ago

Can anybody explain this weird behaviour (tvheadend 3.3.511~g1f4f001 on OpenELEC 3.0, on an Arctic MC001)?

Until yesterday, I had all 6 MUXes from the nearest transmitter (Midhurst) available on all tuners, all working beautifully.

My setup uses the built-in DVB-T tuner of the Arctic, plus 2 dual DVB-T USB sticks, and a DVB-T2 USB stick.

After a reboot, I had duplicated devices, so I deleted the contents of the folders dvbadapters, dvbmuxes and dvbtransports, then restarted the tvheadend service. (I've done this before, and not had a problem.)

After the restart, tvheadend failed to detect any services on any of the 6 local muxes, but was able to pick up a few muxes from more distant transmitters, with lower quality. As a result, all I can get is the BBC services on PSB1 - other MUXes are either not working or have very high error rates, with drop-outs/pixellation.

My first thought was that my aerial had been damaged, or maybe Midhurst was down or that 4G transmissions had started causing interference, so I transferred the USB-connected DVB-T2 tuner to my other PC (which runs Ubuntu 12.04 and tvheadend 3.5.23~g4724e01). I hooked this PC up to the same aerial downlead, and was immediately able to scan all the local MUXes, including the HD ones.

So the problem must be related to the setup on the Arctic... or maybe, when I purged the duplicate DVB devices, I inadvertently stuffed something else in the tvheadend configuration...??

Any ideas gratefully received...


Replies (4)

RE: Mysterious missing MUXes - Added by Adam Sutton over 11 years ago

TVH will have problems with USB tuners if they are not gracefully shutdown and are not brought up in the same order each time. We have been trying to look at improvements to this, but for now you need to manage this manually. Usually by using something like udev to ensure the correct ordering of the devices.

Adam

RE: Mysterious missing MUXes - Added by Richard McBride over 11 years ago

Thanks Adam - I can see how the device assignments in /dev/dvb/ would be affected, but would this behaviour also explain the problem I am experiencing whereby some MUXes show services, while others do not?

I'd really appreciate be your recommendations for configuring udev to avoid this issue.

TVH is a superb PVR client with great ease-of-use features, and when it was working it was awesome. I'd really like to get it going again.

RE: Mysterious missing MUXes - Added by Adam Sutton over 11 years ago

I'm afraid I've not needed to configure udev for this sort of thing (never
for DVB) for a long time. It might be worth a quick search on the forums
though, its been discussed a few times.

It's probably not the reason for the missing services, though can't be 100%
sure. That's more likely down to problems with reception or SI table
processing.

Adam

On 3 April 2013 11:49, wrote:

Tvheadend - Tutorial and setups: RE: Mysterious missing MUXes
Richard McBride

Thanks Adam - I can see how the device assignments in /dev/dvb/ would be
affected, but would this behaviour also explain the problem I am
experiencing whereby some MUXes show services, while others do not?

I'd really appreciate be your recommendations for configuring udev to
avoid this issue.

TVH is a superb PVR client with great ease-of-use features, and when it
was working it was awesome. I'd really like to get it going again.
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RE: Mysterious missing MUXes - Added by Duncan Gillibrand over 11 years ago

I have a similar issue although suddenly have no services.

I am running the same release of tvheadend.

I had been fighting with EPG for a while and managed to sorta work it out and the EPG appeared (yay) but the channels were suddenly duplicated .... one set with the channel name and another set with the display name but none of them would show me TV. I can't remember the error that tvheadend gui was showing me.

So I deleted all the data from XBMC (Frodo 12.1 on Openelec 3.0.0) by uninstalling the tvheadend addon (service and PVR add-on) deleting services.multimedia.tvheadend folder and contents and then reboot and add the add-ons back in and configure.

Then into the gui and add DVB by network location and it scans 68 muxes but no services are ever found. This is the same as I did previously when first setting up albeit that was on Eden with a earlier version of tvheadend.

I can't even add muxes manually as the dropdown only has frequency and modulation (QAM-64 or QAM-256) which are cable options ..... there are no ATSC OTA options.

I have tried multiple times with different options and am now stuck.

Help. Please.

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