Grass Valley CR Series v.3.2 - Manual (Page 182)

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Technical Details
Defaults
Cut transitions do not involve a transition rate. The video transition of a cut is instantaneous. In a
cut, however, the audio fades down over 3 frames and fades back up over 3 frames.
The nominal times for video fades with audio are expressed in seconds. The transition time for
audio cuts is always 3 frames and the exact duration of a frame varies with the video rate. Note
that 3 frames at progressive video rates (e.g., 720p) occur twice as fast as for interlaced video
rates.
This table describes the transitions over a 2-second transition:
Again, for a cut transition, audio ramps down over 3 frames, then ramps up over 3 frames, for a total of 6
frames. The video cut is instantanteous at the transition from the third frame to the fourth frame.
Transition Description
Fade-fade Video and audio ramp down over 1 second, then ramp up over 1 second, for a total of
2 seconds (nominal).
Fade-cut Video and audio ramp down over 2 seconds, then video switches immediately and
audio ramps up over 3 frames, for a total of 2 seconds plus 3 frames.
Cut-fade Audio ramps down over 3 frames. Then video and audio ramp up over 2 seconds, for a
total of 2 seconds plus 3 frames