I got J River Media Center 21 64 bit for Debian Jessie GNU/Linux. There have been important new features and capabilities that have been added to the GNU/Linux version that give it more features parity with the Microsoft Windows and Apple Macintosh OS X versions. First, DSD-64/128/256 bit stream playback is now supported. Second, importing and managing digital photographs is now supported. If you previously purchased a J River Media Center 21 GNU/Linux or master license and installed the previous version, then you can add the official J River software repository and GPG signing key and upgrade without having to restore your license for the new version.
1. sudo apt-get remove mediacenter20
2. sudo apt-get update
3. sudo apt-get install mediacenter21
If you use Google Chrome, then you will need to exit your web browser and open a terminal and type in aplay -l. Once that is done, take a look at your digital sound card to ensure that it says Subdevices: [1/1]. Launch J River Media Center 21 and select the correct sound card in the Tools -> Options - Audio Device. Configure the auto import feature to include the current location of your digital photographs, music, and videos. Run the import process and wait until it is done. Pick the right music album or video and press play. You should be golden!
It just works!
However, I can not get DSD 5.1 or 6 channel to play. I have Pink Floyd's Hotel California recorded in DSD 6.0 channel and J River Media Center 21 won't play it. I do own an Oppo Digital HA-1 DAC and headphone amplifier and it supports two channel stereo. Could this be the reason why?