Date: 2019-02-08 (Reported by Igor)
Author: Dan Dennedy (update 2018-03-30)
Description: Display the GOP structure of a video file (requires ffprobe).
It use "ffmpeg --show-frames"
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1) copy the file "getgop.sh" in the same folder of the video
files to check.

2) change the permission of the file to "execute":
- With Graphic Interface: RMB (Right Mouse Button) over the 
"getgop.sh" file and click on Properties-> Permissions tab,
and check on "Allow this file to run as a program".
- Or with command line:
chmod +x getgop.sh

3) type in command line:  
./getgop.sh inputfilename.mp4

Where "inputfilename.mp4" is the file name of the video with its extension 
(for example: mp4, mp2, mkv, and so on)

The frames may be I, P, B.
