Adobe 22030000 User Guide - Page 44

ENCORE CS3 40 User Guide • Digital Theater Sound (DTS) • mp3 • MPG or M2P (including MPEG-1, MPA, Layer II) • QuickTime (MOV) • WAV (32-bit floating-point files are transcoded; 96-kHz 16/24-bit files are not transcoded) • WMA Note: DTS audio files will not play during Preview in Encore, even though they will play from the burned disc. Advantages of transcoding before or after import A DVD or Blu-ray Disc player can play only video that conforms to certain standards. However, video does not need to be Blu-ray Disc or DVD-compliant before you import it (though it does need to have the correct frame rate and frame size). Encore includes a transcoding engine that can compress (or transcode) files for DVD or Blu-ray Disc playback. You can transcode video before you import it (in a video-editing application), on import, or when you are ready to build the final project. Whether you transcode before or after import is up to you. Encore handles both transcoded and untranscoded files equally well. Transcoding before import Importing transcoded DVD or Blu-ray Disc-compliant content allows you to work with the exact assets that will appear on the disc. Also, because the content is already compliant, the time it takes to build the project will be reduced. Note: In certain instances, Encore needs to transcode DVD or Blu-ray Disc-compliant files. For example, if the data rate of a DVD-compliant file is too high for the amount of content, the program transcodes the file to bring its data rate down. Transcoding after import Allowing Encore to transcode your content gives you more flexibility in placing chapter points (markers within the timeline of the video), inserting subtitles, and trimming your files. The MPEG-2 compression scheme used in transcoding divides the footage into chunks, called a Group of Pictures (GOP). Once transcoded, you can place chapter points and trim only at the header of each GOP, not at specific frames within the group. If you haven't transcoded the file, you are not restricted by GOP headers. In addition, when Encore does transcode the file, it creates GOP headers at every chapter point you set. (See "Add chapter points" on page 132.) Nontranscoded files also give you more flexibility at build time. In large projects, you often need to adjust the video data rate to fit all the video and audio assets on the DVD. If a file is already transcoded, you might have to transcode it again at a lower data rate, or lower the data rate of the other content to reduce file size. See also "Transcoding in Encore" on page 51 Import assets and menus Assets can include any combination of the supported content types. You can use video and audio files for your program content or for motion and sound in menus. You can use still images for menu and program content. You can import files stored on your local drive or a network drive.