[mythtv-users] Cannot max out CPU usage on HLS transcode

John Pilkington J.Pilk at tesco.net
Tue Oct 16 09:57:41 UTC 2012


On 16/10/12 09:59, Jim Downie wrote:
>> Something else to consider, what options are you encoding with? It could
>> very well be possible you are bottle-necked on single-threaded decoding
>> of the recording, and your encoders are just sitting there idle waiting
>> for data to operate on.
>
>
> Masterbackend is set to high cpu usage.
>
>
> The transcode is part of the HLS stream and is converting a 1080i source (already fully written) to 704x400 size (not sure what other parameters are set on this transcode).
>
>
> I have tried 2 HLS transcode simultaneously and the CPU load rises to 60 - 70% so the CPU is able to take the processing - its just that a single transcode cannot max out the CPU.
>
> Any other ideas why this is only using 40% of the CPU for a single HLS transcode?
>

Not really, but can I ask what speeds you are getting?  I recently 
converted a 1080i recording from dvb-t2 to dvd format within 
mytharchive, which uses ffmpeg.  The transcoding step on my laptop took 
about 6* real time.  You have 3* cores and around 2* speed; do you get 
much faster than real time?

Of course usually a similar product is available as the SD broadcast: I 
just failed to record it :-)





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