Used successfully in Jessie through to Stretch.
Follow carefully as below.
Then to answer the question use q on the keyboard.
Start the File Manager and find (say) a sample .mp4 video file.
Right click on that video file.
Select Open With.
Select Custom Command Line.
Enter this in Command Line to Execute "omxplayer -o both".
IMPORTANT without the quotes "" they mark start and end of the command only.
Select Execute in Terminal Emulator.
And also select
Keep Terminal Window Open (needed if you want some control over the player).
Then in Application name enter something like "Omxplayer (video)".
IMPORTANT again without the quotes "" -
or something similar - needed for the association to be remembered and for the above to appear as a right click option.
Finally select Set Selected Application as Default. Then click on OK.
Here on double click on any .mp4 file and omxplayer will start via a persistent Terminal Window.
You will need to use keyboard keys for control so search for the keyboard commands for omxplayer.
However, you can start with (q)uit, (p)ause (space) and the arrow keys.
Repeat the above on sample .mkv, .avi and other video files for them to open similarly in omxplayer.
Addition: use these keys for control:
q quit |
z show info |
p, space pause, continue |
arrow keys navigation |
i,o navigation: previous, next chapter |
j,k previous, next audio stream |
n,m previous, next subtitle stream |
w,x show, hide subtitles |
-,+/= decrease, increase volume.