Tested on two android smartphones: Versions are 4.2.2 and 5.0.2
Video plays fine on both of them, subtitles are also supported correctly.
Music plays fine on 5.0.2 but immediatly leads Emby to crash on 4.2.2.
Attached are logs from server and both androids.
Emby Android version is 2.3.80 on both 5.0.2 and 4.2.2
Emby Server version is 3.0.5675.1
Thanks
android.app.4.2.2.log
android.app.5.0.2.log
server-63573588712.txt