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More => Old Versions => JRiver Media Center 21 for Windows => Topic started by: kr4 on July 18, 2016, 12:54:14 pm

Title: Different downsampling rates severely effect performance.
Post by: kr4 on July 18, 2016, 12:54:14 pm

I am re-posting this here for clarity (I am using MC21) and at Jim H's suggestion.

The issue is strange and has to do with the downsampling of DSD files that I do in order to have roomEQ from DiracLive (which works only in PCM up to 192k).
 
This is with files on a NAS connected to the same switch as the server, with files from a directly-connected USB drive and with files on an internal SSD:
 
1. With a DSD256 5 channel file converted to PCM and DiracLive, success depends on the target resolution:
a. Converted to 192k or 96k, loading is slow and there are interruptions and bufferings every 30 seconds or so.  Dirac on/off makes no difference.
b. Converted to 176k or 88k, everything plays fine without interruption.  Dirac on/off makes no difference.
 
2. In all cases, the CPU/memory usage seems similar (5-22%, mostly in the teens, and memory usage at 2-4 GB).  However, when I look at the individual cores, only 4 are running and the others are “Parked.”  
 
3. On the other hand, network behavior varies strangely.  In case 1b (good playback), network usage averages 2% but peaks in the 85-100mb/s range.  In case 1b (interrupted playback), the average is the same but the peaks are in the 50-60mb/s range.  Changing from direct to play from memory changes the network activity pattern but not the peak values.  
 
I do not know what all this means or what may be significant.  I have a colleague with a very similar setup (i7, 16Gb RAM) who has the same observations.  Sure, conversions to 88k and 176k are arithmetically simpler than to 96 and 192 but the limited core usage puzzles me.

Title: Re: Different downsampling rates severely effect performance.
Post by: Matt on July 18, 2016, 06:08:23 pm

Hi there.

Could you try MC22 with the new SoX resampling option?  I'm just curious if it might help.

Options > Audio > Use SoX for resampling

Thanks.

Title: Re: Different downsampling rates severely effect performance.
Post by: kr4 on July 18, 2016, 07:16:55 pm

I have said this before but................MC22 with SoX works!  I had suspected it might make a difference when I posted this query first in the MC22 forum.  I have not yet tried it with MC22 w/o SoX but I will soon.  And, fwiw, all cores are in action. 

 :)

Title: Re: Different downsampling rates severely effect performance.
Post by: Matt on July 18, 2016, 07:26:06 pm

So does that mean we've found a good working solution (please say yes!)?

Thanks.

Title: Re: Different downsampling rates severely effect performance.
Post by: kr4 on July 18, 2016, 09:56:25 pm

I think so.  I tested it out only briefly but with selections that should have been problematic.  Gimme 24 hours to wring it out.