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In addition to fitting the assets into the available 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 (instantaneous bitrate) of 4008 Mbps 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 bitrate encoder to allocate extra bits when needed to maintain quality A typical bit budgeting process for a disc with a single main video program, plus a few ancillary segments, is depicted in Table 124 Table 124 Sample Bit Budget
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Element Minutes Data Rate Number of Size Streams (Mbits) Formula minutes 60 seconds data rate number of streams
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English audio track (71) DTS-HD 96kHz/24-bit English audio track (20) Spanish, French, and German audio tracks (51 at 448 kbps) 4 subtitle tracks Subtotal (audio and subtitles) Top level menu with video and audio Intro logos (HD video at 18Mbps/audio 51 at 448kbps) Movie Previews (HD video at 18Mbps/audio 51 at 448kbps) Interview (SD video at 6Mbps/audio 20 at 192 kbps) Subtotal (non-movie elements) Total for disc without movie BD-25 capacity (25 Gbytes leaving 5% open) Disc space remaining for movie Calculated bitrate for movie on a BD-25 disc
110 110 110 110
6000 0192 0448 0040
1 1 3 4
39,600 110 60 60 1 = 39,600Mbits 1,267 110 60 0192 1 = 1,267Mbits 8,870 110 60 0448 1 = 1,109Mbits 1,056 110 60 0040 1 = 1,056Mbits 50,794
3 05 25 30
18192 18448 18448 6192
1 3 3 1
3,275 1,660 8,302 11,146 24,382 75,176 196,000 120,824
3 60 (18+192) 1 = 3,275Mbits 05 60 (18+448) 3 = 1,660Mbits 25 60 (18+448) 1 = 8,302Mbits 30 60 (6+192) 1 = 11,146Mbits
25,000/8 95 = 196,000Mbits 196,000 75,176 = 120,824 120,824/(110 60) = 18307Mbps
Calculate the total bitrate and size of the main program s audio tracks and subtitle tracks If there are additional video segments animated logos, top menus with video backgrounds, previews calculate their sizes (including audio), and add them to the total size of the main program s audio and subtitle tracks Still logos and copyright warnings should be authored as timed stills, which have no impact on disc space Subtract the total size of the ancillary material from the disc capacity minus overhead This gives the remaining capacity for the main program
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Calculate the average video bitrate for the main program by dividing the remaining capacity by the running time Also, calculate the maximum video bitrate by subtracting the combined audio and subtitle bitrate from 4008 Mbps These numbers will be set in the encoder when compressing the video for the main program Note that minor elements, such as, subtitle tracks and motion menus, are usually so small that they often can be omitted from calculations If they were left out of the example in Table 124, the average data rate would come out to 2417 Mbps, which is close enough for budgeting purposes An alternative bit budgeting approach is to divide the disc capacity (in bits) by the total running time of all segments (in seconds) to get the average data rate (in Mbps) Adjust up or down for quality of different program elements, as needed For each program, subtract the combined data rate of its audio and subtitle streams to get a video rate It is a good idea to follow up by summing the sizes of each segment (including audio) to check that the total does not exceed the disc capacity
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