4.5

61Compressor User Guide
• Entropy mode: When Codec is set to H.264, use this pop-up menu to set the entropy
mode to CABAC (which provides higher-quality output) or CAVLC (which is faster and
more compatible for playback on older devices).
• Key frame interval: Enter a value in the text field to set the key frame interval (number
of frames) at which you want key frames created in your output file. Alternatively, you
can select Automatic to have Compressor choose the key frame interval rate (the
displayed value is 0 with Automatic on; the actual value is determined during the
encoding process).
• Quality: Use this slider to set the quality level of your output. Select from least (smaller
file size) to best (larger file size).
• 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.
• Include Dolby Vision 8.4 metadata: Select this checkbox to have Compressor include
Dolby Vision 8.4 metadata in the output file. Dolby Vision 8.4 is a format designed to
optimize HDR content for Apple devices. If this checkbox is selected, “Color space”
is set to Rec. 2020 HLG, Codec is set to HEVC, and Profile is set to 10-Bit Color.
• Allow frame reordering: Select this checkbox to potentially provide a better-quality
output file by allowing Compressor to reorder video frames during transcoding. This
option is available only when Codec is set to H.264 or HEVC.
Important: If you select “Allow frame reordering,” your output file may be more
efficiently compressed but may not be compatible with decoders on older hardware.
• 360° metadata: Use this pop-up menu to choose the type of 360° metadata, if any,
included in the output file.
• Automatic: Compressor chooses the metadata format based on the properties in the
Job inspector and the transcode setting you applied. The format chosen is listed to
the right of the pop-up menu.
• None: No 360° metadata is attached to your output file.
• Spherical Video V1: The 360° metadata format most commonly used by sharing sites,
including YouTube and Vimeo.
• Spherical Video V2: A less common, but more up-to-date, 360° metadata format
used by YouTube and Vimeo.
For more information, see View 360° video metadata using Compressor.
Cropping and padding
Customize the final cropping, sizing, and aspect ratio using the Cropping & Padding
properties in Compressor. 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.
• Cropping: This pop-up menu sets the dimension of the output image. The custom
option allows you to enter your own image dimensions in the fields; other options use
predetermined sizes. The Letterbox Area of Source option detects image edges and
automatically enters crop values to match them. This is useful if you want to crop out
the letterbox area (the black bars above and below a widescreen image) of a source
media file.