Thanks for your quick answer!
In fact, it can be the CPU, as I’m using a Rasp Pi B+. Pehaps if I swith to a Rasp Pi 2, it can handle the alac 24/96…
In the other hand, I’m using a Hifiberry Digi+ atached, sending direct to a DAC. So, I think the last DAC is decoding the Alac 24/96, ins’t it? Unfortunately, this is not a solution.
But, yes! FLAC 24/96 plays like a charm!
My Alac 24/96 colection isn’t that big, so conversion should be the best solution!
Thank you guys!