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

David Engel david at istwok.net
Wed Mar 1 16:41:54 UTC 2023


On Wed, Mar 01, 2023 at 04:07:31PM +0000, Philip Brady wrote:
> 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.

Does your HDHR support transcoding and is it enabled?  If so,
recording multiple streams from the same multiplex won't work.

David

> 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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-- 
David Engel
david at istwok.net


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