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Balancing the Bit Budget
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Bit budgeting is a critical step before you encode the audio and video You must determine the data rate for each segment of the disc If you underestimate the bit budget, your assets won t fit and you will have to re-encoded and re-author If you overestimate the bit budget, you will waste space on your disc that could have been used for better quality encoding The idea is to list all the audio and video assets and determine how many of the total bits available on the disc can be allocated to each Part of the early bit budgeting process involves balancing program length and video quality Two axes of control exist: data rate and capacity Within the resulting two-dimensional space, you must balance title length, picture quality, number of audio tracks, quality of audio tracks, number of camera angles, amount of additional footage for seamless branching, and other details The data rate (in megabits per second) multiplied by the playing time (in seconds) gives the size (in megabits) At a desired level of quality, a range of data rates will determine the size of the program If the size is too big, reduce the amount of video, reduce the data rate (and thus the quality), or move up to a bigger capacity disc Once you have determined the disc size and the total playing time, maximize the data rate to fill the disc, which will provide the best quality within the other constraints See Figure 125 to get a general idea of needed disc sizes A DVD-5 holds 1 to 9 hours of video or 2 to 160 hours of audio A DVD-9 holds 2 to 16 hours video or 3 to 300 hours of audio Of course the video quality at high-end playing times is much lower than what is expected from DVD The easiest way to make a bit budget is to use a spreadsheet One is included on the sample disc that comes with this book For simple projects with only one video segment, use the DVDCalc spreadsheet on the sample disc Some authoring programs will calculate bit budgets for you when you use their layout features To simplify calculations, keep track of sizes in megabits, rather than megabytes (see Table 123) Allow an overhead of 3 to 4 percent for control data and backup files which are added during formatting and multiplexing This also allows a bit of breathing room to make sure everything fits on the disc In addition to fitting the assets into the total space on the disc, also make sure that the combined data rate of the streams in a video program do not exceed the maximum data rate (or instantaneous bit rate) of 1008 Mbps
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Figure 125 Data rate vs capacity
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TABLE 123 Disc capacities for bit budgeting
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Billions of bytes Megabits 4% overhead
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DVD-5 47 DVD-9 854 37,600 68,320 1,504 36,096 2,733 65,587
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DVD-10 94 75,200 3,008 72,192
DVD-14 1324 105,920 4,237 101,683
DVD-18 1708 136,640 5,466 131,174
Adjusted capacity
Subtract the audio data rates from the maximum to get the remaining data rate for video Lowering the maximum data rate reduces the ability of a variable bit rate encoder to allocate extra bits when needed to maintain quality Example A typical bit budgeting process for a disc with a single main video program, plus a few ancillary segments, goes as follows (see Table 124) Calculate the total bit rate and size of the main program s audio tracks and subpicture tracks If there are additional video segments such as animated logos, motion menus, and previews, calculate their sizes (including audio and subpictures), and add them to the total size of the main program s audio and subpicture tracks Still logos and copyright
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