vb.net create barcode image Myth: DVD Holds 133 Minutes of Video in Software

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Myth: DVD Holds 133 Minutes of Video
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The oft-quoted length of 133 minutes for DVDs is apocryphal It is simply a rough estimate based on an average 35-Mbps video track and three 384kbps audio tracks (Typical subtitles are negligibly small) If there is only one audio track, the average playing time goes up to 159 minutes The video rate is highly variable a single-layer DVD-5 actually can hold over 9 hours of VHS-quality video There are two constants: disc capacity and maximum data rate (which is 98 Mbps for video and 1008 Mbps combined with audio and subpictures) All the rest is variable Even the capacity varies depending on the number of sides and layers A dual-layer DVD-9 holds over 4 hours of high-quality video, and a double-sided, dual-layer DVD-18 holds over 8 hours Using MPEG-1, a DVD-18 can contain a mind-numbing 33 hours of video, which also would be butt-numbing if you tried to watch all of it in one sitting It is said that the figure of 133 minutes was originated by the press The original SD proposal achieved approximately 142 minutes of playing time, but by adopting 8/16 modulation from the MMCD format, manufacturers sacrificed 63 percent of disc capacity Supposedly, a clever but clueless journalist applied 63 percent to 142, and the meaninglessly exact figure of 133 minutes has stuck ever since
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Anyone talking or writing about DVD-Video should make things easier for themselves and their audience by simply stating that a single layer holds over 2 hours of video If more precision is required, the nice round figure of 2 hours and 15 minutes (135 minutes) is just as accurate It should be noted that all this applies only to DVD-Video A DVDROM can hold any sort of digitized video to be played back on an endless variety of computer hardware or software If someone developed a revolutionary new holographic wavelet compression algorithm, a DVDROM might hold 3 hours of film-quality video It is not likely, but the point is that it is important to differentiate between the deliberate restrictions of DVD-Video and the limited capacity of DVD-Video players compared with the wide-open digital expanse of DVD-ROM and computers
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Myth: DVD-Video Runs at 4692 Mbps
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This figure is about as meaningless as 133 minutes The figure of 4692 Mbps is supposedly the average data rate for a DVD-Video Table 46 shows how it is calculated But what if only one subpicture track is available Then the pristine sum is off by an egregious 003 kbps (or so, since 10 kbps is only an average) And if only one audio track and one subpicture track is available, the so-called average data rate goes all the way up to 3894, an error of more than two-tenths! Sarcasm aside, what usually happens is that the content is compressed to fit the capacity of the disc If the movie is 110 minutes long and has two audio tracks, the video bit budget can be set at a much higher 49 Mbps to achieve better quality Or a 2 1/2-hour movie might be compressed slightly more than usual if the disc producer determines that the video quality is acceptable
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Bit Rate 35 Mbps average video 384 kbps audio 10 kbps average subpicture
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Total 3500 Mbps 1152 Mbps 0040 Mbps 4692 Mbps
4
The probable genesis for this number was that it was calculated from the required 133 minutes of length (which was calculated from the original 135) by figuring out what video data rate was left over after accounting for the audio Then the subpicture tracks were thrown in to even things up The maximum video data rate of DVD is limited to 98 Mbps by the DVDVideo specification The maximum combined rate of video, audio, and subtitles is limited to 1008 Mbps The average data rate is almost always lower, usually between 4 and 6 Mbps Some people assume that DVD is therefore unable to sustain a continuous rate of 98 Mbps or higher This is not the case All DVD players and drives can maintain an internal data rate of at least 1108 Mbps DVD-Video players have a 1-Mbps overhead for navigation data A movie compressed to a constant bit rate of 1008 Mbps would play for 62 minutes Single-speed DVD-ROM drives can sustain a transfer rate of 1108 Mbps, with burst rates as high as 100 Mbps or more, depending on the data buffer and the speed of the drive connection DVD-ROM drives with higher spin rates are accordingly faster, although most multispeed DVD-ROM drives cannot maintain the maximum quoted speed across the entire surface of the disc they only achieve the maximum data rate when reading from the outer edge
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