AppleScripts to skip forward 30 seconds or back 10 seconds in either VLC or QuickTime Player

back 10 seconds

if application "VLC" is running then
	tell application "VLC"
		step backward
	end tell
end if
property step : 10
if application "QuickTime Player" is running then
	tell application "QuickTime Player"
		set playerPosition to (current time of front document) - step
		set movieDuration to duration of front document
		if (front document is playing) then
			set isPlaying to true
		end if
		if (playerPosition ≥ movieDuration) then
			if front document is playing then
				stop front document
			end if
			set playerPosition to movieDuration
			set current time of front document to playerPosition
		else
			set current time of front document to playerPosition
			if (isPlaying) then
				play front document
			end if
		end if
	end tell
end if

forward 30 seconds

if application "VLC" is running then
	tell application "VLC"
		step forward
		step forward
		step forward
	end tell
end if
property step : 30
if application "QuickTime Player" is running then
	tell application "QuickTime Player"
		set playerPosition to (current time of front document) + step
		set movieDuration to duration of front document
		if (front document is playing) then
			set isPlaying to true
		end if
		if (playerPosition ≥ movieDuration) then
			if front document is playing then
				stop front document
			end if
			set playerPosition to movieDuration
			set current time of front document to playerPosition
		else
			set current time of front document to playerPosition
			if (isPlaying) then
				play front document
			end if
		end if
	end tell
end if

@nicwolff: Very usefull scripts. Thank you for providing it!

Hi! Thanks for providing the script, it looks exactly like what I need. Since I'm new to AppleScript, can you explain how could I use it? Ideally I would like to use arrow keys to go forward/backward of 10 seconds while playing videos in Quicktime Player.