ALAC 96kHz and Airplay

Arie_van_Boxel · October 28, 2015, 1:10pm

Hello,
I have discovered that all ALAC 96kHz 16bit files won’t play via Airplay.
The Airplay devices are Apple Airports. The Roon server application is running on an iMac Retina.

andybob · October 28, 2015, 1:32pm

Hi Arie,

I understand AirPlay only supports 44.1 kHz (or 48 kHz on Apple TV). It’s a limitation of AirPlay, not Roon.

paaj · October 28, 2015, 1:56pm

The don’t play at all, or don’t play at 96kHz? They should be resampled by Roon.

Arie_van_Boxel · October 28, 2015, 2:06pm

This format doesn’t play at all. Other ALAC files (lower sample rate) do.
When I click the colored bullet next to the title below, the Signal Chain appears.
It says:

Source
ALAC 96kHz 16bit 2ch
Sample Rate Conversion
96kHz to 44.1kHz
Output
Airplay Streaming

One would expect Roon handles this format.
I only hear one click on the Airplay’s output, but the tracks stays at 0:00.

mike · October 28, 2015, 10:05pm

Hi @Arie_van_Boxel – we’re going to do some testing to see if this is a bug that can be reproduced internally, then @vova or myself will be in touch.

Can you let us know which model of Airport you’re using?

Arie_van_Boxel · October 29, 2015, 7:10am

Thanks,
I am using an Airport Express 2nd generation (A1392). It’s optical output feeds an Audioengine DAC.

mike · October 29, 2015, 3:37pm

We have reproduced this, so it looks like a bug. Good catch @Arie_van_Boxel!

Our next release is already in testing, so a fix for this issue isn’t likely to make it in, but we’ll look into this and follow up here once the fix is live. Sorry for the trouble!