VCR technical terms. Refers to edit records ahead of time to enter the replay value. As the video from the cessation of state or otherwise into the way that the normal playback or recording (including editing records) need a certain amount of time for the servo circuit to achieve a complete lock, in order to steady and accurate editing, you must edit the points in the VCR before it reached into the replay. based on different models and different editing VCR Lock mode, editing, pre-roll time is also different, such as a video editor General Settings G7 seconds pre-roll, while 34 chose 5 seconds Edit video pre-roll, but the way that color into the CG frame need to choose 10 seconds pre-roll editing.

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