4.5

53Compressor User Guide
Retiming
Sets the processing algorithm used to adjust the frame rate during transcoding. Select one
of the following options:
• Set to percent of source using: 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 down arrow).
• Set to: 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 property has
no effect unless the “Frame rate” value in the Video inspector is different from 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, and then select “So source frames play at 25 fps” in the General inspector, the
resulting duration of the transcoded clip (at 25 fps) will be 9 seconds and 15 frames.
For more information, see Retime video and audio using Compressor.
Captions
This area contains a single property, the “Embed closed captions” checkbox. Select the
checkbox if you’ve added CEA-608 closed captions to a job and you want Compressor
to insert the captions into the output video file. See Intro to supporting captions
in Compressor.
Video properties
• Frame size: Use this pop-up menu to set the frame size (resolution) for the output file.
There are four categories to choose from:
• Automatic: Adjusts the output based on the size of the input, and can be constrained
“up to” a maximum resolution.
• Percentage: Adjusts the output based on a percentage of the input’s size.
• Manual: Forces the output to a specific resolution.
• Constrained: Constrains the output to a specific aspect ratio.
• Pixel aspect ratio: Use this pop-up menu to set the pixel aspect ratio (the ratio between
the encoded width and the display width).
• Frame rate: Use this pop-up menu to set the playback rate (the number of images
displayed per second) for the output file. See Retiming options in Compressor.
• Field order: Use the pop-up menu to set the output scanning method (either the field
dominance or a conversion to progressive scanning). There are four options:
• Automatic: Selects the most appropriate field order, based on the field order of the
source and the capabilities of the selected codec.
• Progressive: The video is displayed in complete frames with all lines sampled at the
same instant in time.