check the logs, look for errors.
I found the following errors:
2019-08-02 11:09:38.984 T:4071264256 DEBUG: DBus method call to org.freedesktop.ConsoleKit.Manager.CanStop at /org/freedesktop/ConsoleKit/Manager of org.freedesktop.ConsoleKit failed: org.freedesktop.DBus.Error.ServiceUnknown - The name org.freedesktop.ConsoleKit was not provided by any .service files
2019-08-02 11:23:54.486 T:4049347456 DEBUG: ActiveAE::SyncStream - average error of 21.740620, start adjusting
2019-08-02 11:23:54.486 T:4049347456 DEBUG: ActiveAE::SyncStream - average error 0.740620 below threshold of 30.000000
2019-08-02 11:23:55.487 T:3658253184 DEBUG: CDVDClock::ErrorAdjust - CVideoPlayerAudio::OutputPacket - error:-29886.783229, adjusted:-16666.666667
At the time of freezing, I didn't find any error.
I could also attach a complete log if that would help.
Can other rockpro64 users see full 4k movies?