You can navigate validation videos with the following keys:
- "4" or "a" or "left arrow (on windows)": to go back 1 frame
- "6" or "d" or "right arrow (on windows)": to go forward 1 frame
- "s": to go back 20 frames
- "w": to go forward 20 frames
- "g": to go back 50 frames
- "h": to go forward 50 frames
- "f": to go back 100 frames
- "j": to go forward 100 frames
Then click on "q" to exit the viewing of the validation video.