[mythtv-users] Debugging hdhomerun - can I record the same show from multiple tuners in duplicate?

[Philip Brady]

I have been lurking in the archive but this is my first posting to this forum so please forgive if it goes astray!

I was interested in your symptoms of zero byte recordings.

I have been chasing this (or a similar) problem for months, and am in active dialogue with a developer.
I'm running xubuntu 22.04, mythtv v32 with quad HDHR, DVBT/T2 in the UK.

Symptom:  Zero byte failed recording; log shows it takes too long to acquire a tuning lock.
Rarely, it will 'lock up' the tuner until the HDHR is rebooted or power cycled.

I can reproduce the fault readily and have eliminated power supply, LAN connection, simultaneous recordings, EIT tuning, antenna overloading and disk spin up times.

I can reproduce it if I alternate recordings from mplex 5 and 1.  I can do this very readily with a perl script using API which swamps the backend with short recordings.

Interestingly, mpx5 has a 167KHz offset, but Mpx 1 is the one which fails.

The story is here:
https://forum.mythtv.org/viewtopic.php?f=36&t=5130&sid=77389d8c7f146eb35b326eb655eecbf1

Please join in over on the forum or shout if you'd like a copy of the code to generate lots of recordings.
Phil

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