transcoding format
Compressor provides a variety of transcoding formats to create files playable on a variety of media platforms—from Apple devices to Blu-ray discs to websites, and so on. Each of the built-in settings in the Settings pane uses a specific encoding format compatible with industry-standard platforms.
You can see which format a setting is based on by looking at the summary information at the top of the inspector.

Information about each available encoding format is provided in the Advanced adjustments chapter.