[popcornmix]

@popcornmix: A quick test with Flac audio shows that gapless playback is almost working perfectly, however there's a very brief (sub-second) silence between tracks, is this expected/known?

No, but we did find a number of cases where high cpu caused underrun. You may see "underrun" in log if Pi Sink underruns, but you also get silence inserted when engine underruns without a message.

One issue is that the Sink thread is meant to run at higher (nice=-1) priority than other threads but that may not be allowed.
On raspbian I had to insert

Code:

*                -       nice            -1

/etc/security/limits.conf for this request to have any effect.
In OpenELEC I'm not sure if processes are allowed to decrease their nice level.