[fritsch]

Tested this and #0504 is the last build that is free from the black flash. All builds after that have the same problem. Using Intel Haswell graphics.
Build #0505 added this change, is that the cause for this problem:
VideoPlayer: flush renderManager when hiding video (PR:13824, 2 commits, 1 file changed)  

 That's by intention ... so that for livetv the stream starts with the picture itself and that not the old pic stays on screen. 

This is not correct. Check description of https://github.com/xbmc/xbmc/pull/13824 I'll try to use DiscardBuffers instead. That keeps the frame on screen. 

 Oki - thx for clarification. Then the black screen after the Flush() is a bug?