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T Recording Time
To meet the demands of a Hollywood film production company, one film must fit onto a single disc while keeping the movie's image quality and audio
quality high.
To achieve this, we compress video images using MPEG2 technology, sub-video
images (superimposed) using run length coding compression; produce high-quality audio using linear PCM, Dolby Digital AC-3, DTS and MPEG
audio; and make the surround system recordable. The resulting recording time is about 133 minutes.
Approximately 93% of Hollywood movies can each be recorded on one disc.
Video image
Audio
Sub-video image
Total
The recording capacity of a disc is 4.7 GB, so:
4700 Mbyte q 8 s(4.692 Mbit/sec q 60 second ) = 133.5 minutes
Therefore, one side of a disc can record about 133 minutes.
T Key of High Image Quality
Thanks to MPEG2, the digital image compression technology, you can enjoy a DVD-Video movie which features the same image quality as that of
a film shown in a theater. MPEG2 is the technology that superseded the MPEG1, which is employed in video CDs. MPEG2 technology produces a
higher level of image quality.
Video compression
Number of pixels (NTSC)
Number of pixels (PAL)
Holizontal resolution
Cording bit rate
Frame rate
Max. data transfer late
Average date transfer rate
Playback time
subtitles
other
For example, below is one of the actually bit rate of DVD.
3.5 Mbit / sec
1152 kbit / sec
40 kbit / sec
4.692 Mbit / sec
DVD
MPEG2
720 q 480
720 q 576
more than 500 lines
variable / constant
30 frame / sec
(60 field / sec)
10.08 Mbit / s
3.5 Mbit / s
133 min. (1 layer / 1 sided)
480 min. (2 layer / 2 sided)
32 subtitles
multi aspect ratio
9
Video-CD
MPEG1
352 q 240
352 q 288
240 lines
constant
30 frame / sec
–––
1.15 Mbit / s
1.15 Mbit / s
74 minutes
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SL-DV100
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