double call to channel change script

[jhoyt4]

Upon restart, mythbackend appears to be issuing two calls to the channel change script when scheduling the first recording after the backend starts. The same occurs if entering Live TV after the backend restarts.

This is occurring with an external recorder .

• Platform: Ubuntu 22.04 (Linux mythtv 5.15.0-37-generic 39-Ubuntu SMP Wed Jun 1 19:16:45 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux)

• MythTV version: fixes/32

• Package version: mythbuntu ppa: v32.0+fixes.202206060103.7077a824d2~ubuntu22.04.1

• Component: mythbackend

What steps will reproduce the bug?

1. restart mythbackend
2. start Live TV

or

1. restart mythbackend
2. schedule a recording to start immediately

How often does it reproduce? Is there a required condition?

Every time after mythbackend restarts

What is the expected behaviour?

Only a single call to the channel change script

What do you see instead?

Two calls to the channel change script

Jun 11 16:09:55 mythtv mythbackend: mythbackend[3537]: I MetadataDownload metadatagrabber.cpp:377 (RunGrabber) Running Grabber: /usr/share/mythtv/metadata/Television/ttvdb4.py -l en -a US -N Chicago Fire Retaliation Hit
Jun 11 16:09:55 mythtv mythbackend: mythbackend[3537]: D MetadataDownload mythsystemunix.cpp:808 (Fork) Launching: /usr/share/mythtv/metadata/Television/ttvdb4.py -l en -a US -N Chicago Fire Retaliation Hit
Jun 11 16:09:55 mythtv mythbackend: mythbackend[3537]: I MetadataDownload mythsystemunix.cpp:965 (Fork) Managed child (PID: 3623) has started! command=/usr/share/mythtv/metadata/Television/ttvdb4.py -l en -a US -N Chicago Fire Retaliation Hit, timeout=0
Jun 11 16:09:55 mythtv mythbackend: mythbackend[3537]: I SystemManager mythsystemunix.cpp:354 (run) Managed child (PID: 3552) has exited! command=/usr/local/bin/ir_channel_change.bash 510, status=0, result=0
Jun 11 16:09:59 mythtv mythbackend: mythbackend[3537]: D TVRecEvent mythsystemunix.cpp:808 (Fork) Launching: /usr/local/bin/ir_channel_change.bash 550
Jun 11 16:09:59 mythtv mythbackend: mythbackend[3537]: I TVRecEvent mythsystemunix.cpp:965 (Fork) Managed child (PID: 3638) has started! *& command=/usr/local/bin/ir_channel_change.bash 550, timeout=0
Jun 11 16:09:59 mythtv mythbackend: mythbackend[3537]: D TVRecEvent mythsystemunix.cpp:808 (Fork) Launching: /usr/local/bin/ir_channel_change.bash 550
Jun 11 16:09:59 mythtv mythbackend: mythbackend[3537]: I TVRecEvent mythsystemunix.cpp:965 (Fork) Managed child (PID: 3641) has started! *& command=/usr/local/bin/ir_channel_change.bash 550, timeout=0

Additional information

I've been seeing missed channel changes for several months, and unfortunately only now tracked down the culprit.

[jhoyt4]

Looks like others are experiencing the same issue: https://forum.mythtv.org/viewtopic.php?f=29&t=5289&p=25490#p25490

[rwis42]

I'm experiencing the same thing.
Ubuntu 22.04.1 LTS
MythTV 32.0 + fixes
package: mythtv/jammy,now 2:32.0+fixes.20220325.f69ce764b7-0ubuntu1 all [installed]