v35 Channel Scan never gets into Database

[bakasan]

Setup:

• Ubuntu v24.04 (all updates)

• MythTV v35 built from source to debs

• Two DVB-T Cards (been working with MythTV for years)

• A normal user running mythfrontend, but added to mythtv group

Performing a Channel Scan through the web interface, or through the deprecated setup interface produces a flawless scan. All the local channels are found, and even stored to the scan file.

From a run of

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mythtv-setup -v chanscan --loglevel=debug

as either my normal user, or sudo ~

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Channel list (39):
578500000:7HD Newcastle:6:12930:12930:2366:2480=2480:dvb
578500000:7HD Newcastle:60:12930:12930:2410:2480=2480:dvb
578500000:7twoHD Newcastle:62:12930:12930:2412:2480=2480:dvb
578500000:7mateHD Newcastle:64:12930:12930:2414:2480=2480:dvb
578500000:7Bravo:65:12930:12930:2415:2480=2480:dvb

But after save-exiting the channel scan, under the [Input Connections] option [Starting Channel] there are no channels listed.

Checking the database:

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mysql> select * from channel;
Empty set (0.00 sec)

I've also tried importing the existing scan-file, which once-again appears like it has worked, but the database remains empty.

The channel-scan logs ends like this below. I don't know if it's important, but it concerns me that there's 39 channels, but it says "Found 39 unused transports."

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Channels: FTA Enc Dec
ATSC        0   0   0
DVB        39   0   0
SCTE        0   0   0
MPEG        0   0   0
NTSC        0
Unique: prog 39 atsc 0 atsc minor 0 channum 39
Max ATSC major count: 0
2025-04-18 07:03:19.032957 I  ChanImport: Found 39 unused transports.

Mythfrontend (now I changed mysql to listen on 0.0.0.0) uses the database happily.

Any help much appreciated. This has never been a problem before (since 2008).

thanks,
-kt

[bakasan]

Where are channel-scan files stored?

[bakasan]

I've debugged this as far as seeing the dtv_multiplex table getting populated, but the channel table is never populated, and at the end of the import cycle, the dtv_multiplex table is cleared again - this is the "39 unused transports".

So it's inserting the "transports", but for some reason the channels are failing.

[kmdewaal]

Thanks for the analysis. Looks like this problem is the same as this one https://github.com/MythTV/mythtv/issues/1070