#That just may show after restart windows10 with low probability.
#prepare
create a VLCplayer in xaml the same as Example.
play a MP4 after the Event ContentRendered.
restart Windows10 computer and start the program.
#phenomenon //restart window + fisrt start programe
it will always take a few time to fisrt initialize VLC
it may play without image with low probability. But if i restart the programe, it just can work well again