FFPLAY comes bundled with the ffmpeg download. The ffplay is a simple to use command line app for playing the extracted streams that you have just created.
The simple use of fflplay is just:
However, the issue with UHD streams is that they are larger than most monitors, so it is generally necessary to either rescale the output, or force it to fullscreen.
To replay a video in a window.
ffplay -i video.mpg -vf scale=800x600 This will replay the selected file at a window size of 800x600. Remember, currently (End 2016) UHD streams play very poorly and you will only get 1 or 2 frames per second.
To replay a video full screen.
ffplay -i video.mpg -vs This will replay the video at fullscreen resolution.