14:30
The ODAC is by specs unable to convert 24/88, so I would expect to hear nothing at all when I try to run such a file (like in foobar, that makes some "unable" comment).
In fact, I hear something -stuttering, but at least audible.
Is that an heroic dac trying to give his best in converting he was not made for by his creator or is it the act of an infamout Pi, trying to resample something that otherwise would be unplayable.
All Resampling is deactivated in mpd.conf (I hope) but since i cannot measure the bit-perfectness of the output, I´m a bit unsure…..
Thx for enlightenment
Christian
Hi, it is probably the second one you said… Mpd outputs to alsa, then alsa tries to feed the dac with the closest bitrate\bitdepth available… So he is doing some sort of resample…
To find out just type :
cat /proc/asound/card0/pcm0p/sub0/hw_params
While playing, and it will return you the exact bit rate \ bit depth that the dac is receiving. Very interesing question btw, let me know!
11:08
Hi,
great, that worked.
You were right. MPaD, the controlprogramm on my IPad, tells me 88200 Hz, cat …~hw_params returns 96000.
So indeed in this special case there is no bit-perfect replay, depending on the capability of the dac.
That´s fine with me it´s simply greater usability, as long as I can rely on the unaltered status of the greatest part of my music.
Thanks again for the help.
You're welcome… Please note that also the resampling quality is not so great… You can use a better resampler algorythm, by changing this line in the mpd.conf
#samplerate_converter "Fastest Sinc Interpolator"
to
samplerate_converter "Best Sinc Interpolator"
Then save and restart mpd
sudo /etc/init.d/mpd restart
In my tests the processing power demanded to the little Pi was not enough to handle this better algorythm. But I was using an async device, try and see if it works for you. If it doesn't just comment the line again and restart mpd.
For more info about these different resampling methods see here:
http://www.mega-nerd.com/SRC/
Best sinc interpolator is the Secret Rabbit Code, Btw…
22:31
True, SRC is ok, if you have to use resampling at all. I used it with foobar because not all of my dacs are able to handle all sample frequencys and I did not want to hard-convert my music to the lowest common denominator.
Concerning the stuttering – it was completely away when I switched from USB-Drive to Nas via WiFi. I guess there is some extra Processor load in the Pi from handling the USB-HD instead of being nicely served by a friendly server.
In the NAS configuration the Pi even did play 192 kHz Files to my xmos/sabre without stuttering (confirmed with this great …params command).
But this seems quite close to the limit, the output to the ODAC (which had of course be resampled to 96 kHz) was quite disrupted.
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