Upsampling MQA files to original resolution with sox will sound like the original resolution

[Cebolla]

The MinimServer UPnP media server can resample using SoX via its MinimStreamer transcoder, with appropriate streaming options set and a version of ffmpeg built with libsoxr, installed on the same machine:

http://minimstreamer.com/userguide.html#Streaming options

https://www.johnvansickle.com/ffmpeg/

 

 

[Cebolla]

1 hour ago, jaaptina said:

Hi, 

I asked Simon at Minimserver how to do what you propose using fmpeg transcoding with Minimstreamer. It seems it is not easy. Any suggestions are welcome!  

 

http://forum.minimserver.com/showthread.php?tid=4088

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The problem is with ffmpeg's Resampler seemingly not exposing the relevant SoX flags in its options, in order for you to be able to configure SoX for MQA as suggested:

https://trac.ffmpeg.org/wiki/FFmpeg and the SoX Resampler

https://www.ffmpeg.org/ffmpeg-resampler.html

[Cebolla]

 

On 5/13/2020 at 11:23 AM, granosalis said:

is there any way to perform the MQA upsampling in minimserver (using minimstreamer) of MQA file using sox? 
 

 

It should be possible, but as has been pointed out by Miska two posts above yours:

On 3/12/2020 at 11:40 AM, Miska said:

You need to first perform first unfold in software and then do the upsampling to get more what you'd expect. Now the result you are getting just as expected with MQA data as encoded noise below 22.05 kHz.

 

How do you propose to get the first unfold from the MQA files into Minimserver/Minimstreamer for it to do the upsampling with filter in the first place?

[Cebolla]

Possibly not for 16-bit MQA-CD file tracks, as it's hard to see how much of higher frequency info can be uncompressd from just the one bit that's MQA encoded, especially as the same bit is also used to contain other information such as identify it as MQA encoded & what it should be upsampled to. However, the same could not be said for the 24-bit MQA source file tracks which has 9 of those bits MQA encoded.