VLC player
Use the VLC player with codecs if the videoplayer in Subtitle Edit does not function.
The official website of VLC:
https://www.videolan.org/vlc/index.nl.html
Download the 32-bits version:
https://get.videolan.org/vlc/2.2.6/win32/vlc-2.2.6-win32.exe
If you have a 64-bits computer you are obliged to use the 64-bits version of VLC-player:
https://get.videolan.org/vlc/2.2.6/win64/vlc-2.2.6-win64.exe
Make sure you install the program as Administrator
Right click the icon to use the option install as Administrator
Don’t forget to restart your computer after installing VLC media player
In Subtitle Edit go to:
Options – Settings …
Set the Video player to VLC media player
If the video still is not showing, you have to install LAVFilters