Autodesk 64006-051108-9001 User Guide - Page 187

Tracks Tab 179 Copy The Copy option enables you to designate tracks that should be copied into the final output movie without processing and encoding. This option is also useful for movies where you need to encode (or re-encode) only one track and simply copy the other into the final file. For example, if you have a movie that already has a finished audio track but still need to encode the video track, you can select Copy for the audio and Process for the video. The Copy option is also useful for QuickTime movies that have tracks, such as sprites or text, that should be copied to the final file without processing. Copying these files preserves their unique qualities instead of turning them into pixels in the video track. Process The Process option causes the selected track to be processed and compressed when added to the final output movie. This is normally how you handle video and audio tracks. It's possible to not process certain track types, such as QuickTime music, so Process is not always an option. Preload Forces the player to preload the track in RAM before it can be played. Useful for automatically playing high bitrate movies that would otherwise cause skipping. See "Enhanced Movie Playback" on page 45. Display High Quality Enable to display the video track with a higher quality dithering, interpolated scale, or other features (depending on the codec) during playback. Other Tracks Space is provided to allow for two other QuickTime tracks not specifically listed in the Tracks tab. If you have a movie with a track type not listed, you must type in the four-letter track code in the Other field.