4.2

This section contains one property:
Set duration to: Sets the processing algorithm used to adjust
the frame rate during transcoding. Select one of the following
options:
[Percentage] of source: Modifies the output clip’s speed by
a percentage of the source clip’s speed. Enter a value in
the percentage field or choose a preset value from the
adjacent pop-up menu (with a downward arrow).
[Total duration]: Sets the duration of the clip. Enter a
timecode duration in the field or click the arrows to
increase or decrease the time.
So source frames play at [frame rate] fps: Nondestructively
changes the playback speed of the clip, without discarding
frames or creating new frames. This setting has no effect
unless the “Frame rate” value in the Video inspector is
different than the source file’s frame rate. For example, if
you add a 10-second source file with a frame rate of 24
fps to Compressor, set the “Frame rate” property in the
Video inspector to 25 fps, then select “So source frames
play at 25 fps” in the General inspector, the duration of the
transcoded clip (at 25 fps) is 9 seconds and 15 frames.
Note: This option is not available when outputting an
MPEG-4 audio file.
For more information, see .
Video properties
Frame size: Use the pop-up menu to set the frame size
Retime video and audio