Hi JimH, thanks for advice.
My situation is as follows;
My library is quite huge, consisting of ALAC(Apple Lossless) and FLAC, about 700GB on 1TB Sundisk microSDXC card.
When JRiver for Android initially boots up and starts to import folders, at the first time, VLC can read music for a while. But gradually as many folders imported, VLC can't handle. (display nothing)
Nevertheless, mconnect Player Lite can read JRiver for Android as I said before.
And if I use my PC version JRiver MC (26.0) as a DNLA client, I can handle JRiver for Android with no problem.
Not 100% satisfied, but I'm using JRiver for Android anyway.