Film editing Techniques

180 degree rule

In film/TV it is a basic guideline stating that two elements, e.g. characters, in the same scene should always have the same left/right relationship to each other.
'Crossing the line' means the camera passes over the imaginary axis connecting the two subjects.

http://www.youtube.com/watch?v=HdyyuqmCW14

Match on action

A continuity editing technique where an edit takes place in the middle of an action.
In other words it is a cut that connects two different views of the same action at the same moment in the movement.

http://www.youtube.com/watch?v=laUPi7MPOSQ

Shot reverse shot

A film technique where one character is shown looking (often off screen) at another character, and then the second character is shown looking back at the first. As the characters are shown facing in opposite directions, the viewer subconsciously assumes that they are looking at each other.

http://www.youtube.com/watch?v=QLkUHZ1qips