4.5

43Compressor User Guide
• 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.
Video properties
• Frame size: Use the pop-up menu to set the frame size (resolution) for the output file.
See Intro to modifying frame size in Compressor.
• Pixel aspect ratio: For settings that use the H.264 format, the pixel aspect ratio is
automatically set to Square.
• Frame rate: Use this pop-up menu to set the playback rate (the number of images
displayed per second) of the output file. See Retiming options in Compressor.
• Field order: For settings that use the H.264 format, the field order is automatically set
to Progressive (complete frames are scanned).
• Color space: Use this pop-up menu to convert the source media to a new color space.
The default setting is Automatic, which allows Compressor to choose the best color
space based on the selected preset. You can also choose a manual setting to override
the default.
• RAW to log: Use this pop-up menu to select how ProRes RAW conversion is done.
Choose Automatic to allow Compressor to choose the conversion method. You can
also choose a manual setting to override the default. This option is available only if the
source is ProRes RAW.
• Camera LUT: Use this pop-up menu to select the camera lookup table (LUT) applied
to the source. Select a custom LUT to transform your video from one color space to
another. This setting is enabled if the source is ProRes RAW and if “RAW to log” is
set to a value other than None. This setting is also enabled if “Camera log” in video
properties in the Job inspector is set to a value other than None.
• Automatically select bit-rate: Select this checkbox to have Compressor automatically
compute the best bit rate for the output file, based on the duration of the source file.
If the checkbox is not selected, you can set the average and maximum bit rates by
dragging the “Average bit rate” and “Maximum bit rate” sliders or entering values in the
text fields.
• Multi-pass: Select this checkbox to turn on multi-pass encoding that uses additional
analysis of video frames to produce a high-quality output file. For faster (single-pass)
transcoding, turn this feature off by deselecting the checkbox.
Cropping and padding
Customize the final cropping, sizing, and aspect ratio using the Cropping & Padding
properties. Cropping removes video content from an image. Padding scales the image to
a smaller size while retaining the output image’s frame size. For more information about
these properties, see Intro to modifying frame size in Compressor.