User guide

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Appendix A, Data Rates and A/V Disk Space Requirements
DV/MPEG-2 qualities and required disk space
The following table shows approximately how much disk space you’ll need per
minute of video when creating DV/DVCAM .avi files and MPEG-2 Elementary
(.m2v) files at various data rates.
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 RT.X100 Xtreme.
Video
Quality
Data
Rate
1
(Mb/sec)
1
In this calculation, a megabit (Mb) is equal to 1,000,000 (1000 × 1000)
bits.
Data
Rate
2
(MB/sec)
2
In this calculation, a megabyte (MB) is equal to 1,048,576 (1024 ×1024)
bytes.
Compression
Ratio
File Size
(MB/min)
Min/1 GB
3
of storage
3
In this calculation, a gigabyte (GB) is equal to 1024 megabytes (MB), the
conventional value used for calculating storage.
DV/DVCAM 25.0
2.98 5:1
178.0
5.8
MPEG-2 2.0
0.24 61.7:1
14.0
73.0
MPEG-2 7.0
0.83 17.8:1
49.8
20.6
MPEG-2 9.0
1.07 13.8:1
64.0
16.0
Sampling
Rate
Bits per
Sample
Type
File Size
(MB/min)
Min/1 GB of
Storage
48 kHz 16
Stereo
11 93.1