Tuners no longer able to get a channel lock

[briggella]

I have a new Mythtv build after a recent hardware failure and all has been working well with three tuners, 2 in PCIe slots and 1 usb. I am running Myth version v34.0+fixes.202504131949.a473f5e2d7~ubuntu24.04.1. As of 24 hrs ago my tuners stopped getting a channel lock and all recordings failed. I have not made any changes to trigger this and there have been no weather events. There is a satellite signal as one of the outputs from the splitter goes to my satellite box and is still receiving a nice clear signal for satellite TV. The other 3 outputs go to my tuners. Firmware is loading correctly and the channel profiles are populated. The only odd thing of note that has popped up is that the database schema is 1379. I am not sure what the front end schema is but the backend schema version is being highlighted as an issue. However no option to update it is being offered.


Hardware

Socket Designation: LGA1700
Type: Central Processor
Family: Core i7

Manufacturer: ASUSTeK COMPUTER INC.
Product Name: PRIME B760M-A WIFI
Version: Rev 1.xx

2 x Hauppauge WinTV-HVR5525 PCIe
PCTV DVB-S2 Stick (461e) USB

Linux Mint 21

Mythtv version v34.0+fixes.202504131949.a473f5e2d7~ubuntu24.04.1

I assume part of the solution is to upgrade the scehma from 1379 to whatever the fronend is but I do not know how and I am puzzled as to why it should be out of sync.

[white_haired_uncle]

I have a new Mythtv build after a recent hardware failure and all has been working well with three tuners, 2 in PCIe slots and 1 usb. I am running Myth version v34.0+fixes.202504131949.a473f5e2d7~ubuntu24.04.1. As of 24 hrs ago my tuners stopped getting a channel lock and all recordings failed. I have not made any changes to trigger this and there have been no weather events. There is a satellite signal as one of the outputs from the splitter goes to my satellite box and is still receiving a nice clear signal for satellite TV. The other 3 outputs go to my tuners. Firmware is loading correctly and the channel profiles are populated. The only odd thing of note that has popped up is that the database schema is 1379. I am not sure what the front end schema is but the backend schema version is being highlighted as an issue. However no option to update it is being offered.

I think 1379 was the schema for v34. You say it's being highlighted, but where?

You can check the FE schema, though if it was working it's not going to just change:

Code: Select all

$ grep -i schema /var/log/mythtv/mythfrontend.log

Splitters usually don't split equally, there's usually one output that's "better" than the rest, so it's POSSIBLE your signal is now just weak enough... Pretty slim.

You didn't happen to configure unattended-upgrades?

Have you tried something like VLC or TSReaderLite?

[briggella]

This is the splitter and the satellite box for normal TV is working fine off it. The Mythbox has been working fine for 3 years off it. I suspect the signal should be OK.

https://digitalimports.co.nz/product/di ... ule-4-way/

Will check the unattended-upgrades when I get home. Not tried VLC yet but will try when I get home.

[kmdewaal]

If you stay in version v34 then the database version should not change.
Only if you have (accidentally?) upgraded to v35 or master then the database version that is compiled into the code is different from the version that is in the database and then an upgrade of the database is needed.
When you start mythbackend interactively (in a terminal window) then you the information about the database versions and you get the question if you want to upgrade the database so that it does match the code.

[briggella]

I have noticed that updates has been set to install security updates automatically.

checking mythfrontend --version and mythbackend --version, the results are the same - v34.0+fixes.202504131949.a473f5e2d7~ubuntu24.04.1.
Which is a little puzzling why the schema is being flagged.

I have just found out that the Optus D1 satellite has been changed overnight for a new satellite in the same position. Satellite boxes should adapt automatically but I am not sure what would happen in Myth.

I couldn't work out how to use vlc to use the tuners to stream a TV signal

[kmdewaal]

I have just found out that the Optus D1 satellite has been changed overnight for a new satellite in the same position. Satellite boxes should adapt automatically but I am not sure what would happen in Myth.

You do need to do a new channel scan.

[briggella]

done a channel scan and found new channels but they will not update the video source file. I assume this is due to the issue with the schema issues. This is being flagged up in web setup wizard in the database setup section.
'Database is connected' and 'have mythconverg database' are highlighted in green with a tick but 'Database scema is 1379' is highlighted in blue with an i in a circle.

running the command for the schema id above on mythfrontend.log just reveals 1379.

Code: Select all

grep -i schema /var/log/mythtv/mythfrontend.log
2025-04-17T18:04:19.496800+12:00 Mythbox mythfrontend.real: mythfrontend[20536]: I CoreContext schemawizard.cpp:117 (Compare) Current MythTV Schema Version (DBSchemaVer): 1379
2025-04-17T18:49:19.360672+12:00 Mythbox mythfrontend.real: mythfrontend[5010]: I CoreContext schemawizard.cpp:117 (Compare) Current MythTV Schema Version (DBSchemaVer): 1379

[white_haired_uncle]

'Database is connected' and 'have mythconverg database' are highlighted in green with a tick but 'Database scema is 1379' is highlighted in blue with an i in a circle.

That's what mine looks like and everything is fine here.

[kmdewaal]

I think this is problem is difficult to diagnose without more information. The next step is that you post a log of mythbackend. Preferably a complete log from the start onwards. It is not possible to attach log files to the forum so you can either post a link to a file sharing site or create a MythTV ticket on https://github.com/MythTV/mythtv/issues and attach the log there.

[briggella]

post created on github

https://github.com/MythTV/mythtv/issues/1071

[briggella]

I have run a channelscan with a new video source and it found 32 channels. Once finished I saved it but my vidoe source was empty as it appeared not to ahve saved anything. It does this everytime. I am also unable to update the old video source. I attach the latest Mythbackend log and the mythconverg files list on the github listing relating to channels so you can see which ones are updating and which ones are not.

https://github.com/MythTV/mythtv/issues/1071