[mythtv-users] video artifacts on recordings: could building a raid be the cause?

George Mari george_mythusers at mari1938.org
Wed Dec 27 16:05:40 UTC 2017

On 12/27/2017 09:50 AM, jksj wrote:
> I have had what looks like the effect of poor signal on a recording, 
> the same as described at the top of the thread. This occurred when 
> writing 4 HD channels to a SATA drive (not used by the database) and 
> watching a different channel. Machine load was < 10%.
> I know that when poor reception is the cause the backend logs the fact 
> and marks the recording as failed. Frontend shows a red box round the 
> program.
> Is there any way of telling whether disk access time is causing a 
> problem?
> Anything logged?
> Does the backend stall waiting is there a throw away mechanism. The 
> other three simultaneous recordings were perfect.
Look in the mythbackend log file for messages including the string "TFW" 
and also, "took a long time".  This is from the Threaded File Writer 
saying it's trying to continue writing your recording to the disk, but 
the current buffer took longer than 1 second.

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