Adobe 22030000 User Guide - Page 31

ENCORE CS3 27 User Guide You determine the optimal data rate through the process of bit budgeting. To understand bit budgeting, you first need to understand the variables involved: disc size, types and amounts of assets (audio, video, and motion menus), and data rates and transcoding. Once familiar with the variables involved, you'll be able to produce a bit budget to guide you in producing high-quality projects that fit within the allotted disc space. See also "About transcoding" on page 51 Determining disc size Before you can prepare a bit budget, you must determine the size of disc on which to distribute your project. Encore can create projects for 25-GB Blu-ray discs and for a variety of DVD disc sizes. The size you choose is based on the amount of video and the replication method. Typically, a Blu-ray disc can hold 135 minutes of high-definition video using MPEG-2 plus 2 hours of standarddefinition bonus material, or it can hold a total of 10 hours of standard-definition content. Encore also supports H.264 encoding for Blu-ray projects, which provides better quality at lower bit rates than MPEG-2 and therefore more video time. Desktop DVD burners use a recordable DVD-5 disc (DVD+/-R), which has a 4.7-GB capacity and can hold approximately 2 hours of high-quality, standard-definition video. Encore also supports DLT (digital linear tape), which requires a DLT drive connected to your computer, as well as dual-layer DVDs and dual-sided DVDs. Check your DVD recorder's documentation to see if it can create dual-sided or dual-layer discs. If your disc recorder cannot produce these discs, Encore can still create the project files for them, but you'll need to replicate the disc at a replication facility. When preparing a project for dual-layer or dual-sided DVDs, keep the following information in mind: Dual-layer disc Encore supports DVD-R DL and DVD+R DL discs; check your recorder's documentation to see what type of DVDs (+R or -R) it requires. To replicate dual-layer DVDs at a replication facility, you first must write your project to two separate DLTs, one tape for each layer of the disc, using the DVD Master output option. (See "Build a DVD or Blu-ray disc" on page 175 and "Specify a layer break for dual-layer DVDs" on page 177.) Note: Be aware that +R discs may be incompatible with some DVD players. Before duplicating a large quantity of discs, it's worthwhile to create a sample disc and test it on several different DVD players. Replication facilities, whose paramount purpose is duplicating discs, create discs with the widest possible compatibility. Dual-sided disc For dual-sided DVDs, you must create two separate projects. If you will replicate the DVDs at an outside facility, use the DVD Master output option to write each project to its own DLT. (See "Build a DVD or Bluray disc" on page 175 and "Replicating discs" on page 178.) Dual-sided, dual-layer disc In this case, you need to build two projects, each producing two tapes. The first two tapes represent the two layers of the first project (Side 1). The other two tapes represent the two layers of the second project (Side 2). Set the disc size for DVD projects By setting the disc size for your DVD project at the beginning of the authoring process, Encore can calculate how much space is used for each asset you add to the project and how much space remains free. 1 Choose Window > Build. 2 In the Build panel, choose DVD from the Format menu, and scroll down to the Disc Info section. 3 Choose a size from the Size menu. To enter a custom disc size, choose Custom and then type a size in the text box.