Dv/Mpeg-2 Qualities And Required Disk Space; Audio Sampling And Required Disk Space - Matrox RT2000 Installation & User Manual

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DV/MPEG-2 qualities and required disk space

The following table shows approximately how much disk space you'll need per
minute of video captured at various qualities using the DV and MPEG-2 IBP
compression schemes on your Matrox RT2000 system.
Video
Quality
MPEG-2 IBP
MPEG-2 IBP
MPEG-2 IBP
MPEG-2 IBP
MPEG-2 IBP
1
In this calculation, a megabit (Mb) is equal to 1,000,000 (1000 × 1000) bits.
2
In this calculation, a megabyte (MB) is equal to 1,048,576 (1024 × 1024) bytes.
3
In this calculation, a gigabyte (GB) is equal to 1024 megabytes (MB), the conven-
tional value used for calculating storage.
4
DV includes the DV, DVCAM, and DVCPRO formats.
¯Note The data rate for MPEG-2 I-frame video is determined by the quality you
select and the complexity of the video. At the highest quality setting, the data rate
is about 25 Mb/sec.

Audio sampling and required disk space

The following table shows how much disk space you'll need per minute of audio
sampled on your Matrox RT2000.
Sampling
Rate
48 kHz
Appendix B, Data Rates and A/V Disk Space Requirements
Data Rate
(Mb/sec)
4
DV 25.0
2.0
7.0
9.0
12.0
15.0
Bits per
Sample
16
1 2
Data Rate Compression
(MB/sec) Ratio
2.98
0.24 61.7:1
0.83 17.8:1
1.07 13.8:1
1.43 10.4:1
1.79 8.3:1
Type
Stereo
File Size
(MB/min)
5:1 178.0
14.0
49.8
64.0
86.0
107.0
File Size Min/1 GB of
(MB/min)
11
3
Min/1 GB
of storage
5.8
73.0
20.6
16.0
12.0
9.6
Storage
93.1