Apple Compressor (4.0) - Manual (Page 171)

Chapter 7 Advanced functions 171
Retiming Control
Use the controls in this area of the Frame Controls pane to choose the algorithm with which
frame rates are adjusted.
Note: When you use the retiming controls to change video speed, Compressor also adjusts
the audio portion of the output media file so that it stays in sync with the video. The retiming
controls do not affect the audio pitch. For more information about using these options, see
About retiming on page 175.
•
Rate Conversion: Choose a frame-retiming method (to change the frame rate) from this pop-up
menu. This decision is a trade-off between faster processing time and higher output quality.
In many cases, the Better setting provides sufficiently high-quality conversion at a substantial
savings in processing time over the Best setting.
Important: Using all Best settings may result in unexpectedly long processing times. The
Better setting for rate conversion provides sufficiently high-quality conversion at a substantial
savings in processing time over the Best setting.
The Rate Conversion pop-up menu contains the following options:
•
Fast (Nearest frame): Applies no frame blending; Compressor simply uses a copy of the
nearest available frame to fill the new in-between frames.
•
Good (Frame blending): Averages neighboring frames together to create new
in-between frames.
•
Better (Motion compensated): Uses optical flow to interpolate frames, with
good-quality results.
•
Best (High quality motion compensated): Uses optical flow to interpolate frames, with higher-
quality results; this option is particularly useful for transcodes that involve increases in frame
rates (for example, 23.98 fps to 59.94 fps).
•
Set Duration to: Choose one of three methods to convert the clip’s duration to a new duration:
Selection pop-up menu