Extron electronics SMP 300 Series User Manual

SMP300 Series • Reference Information 159
Estimating Storage Requirements for a Recording
Estimating Storage per Recording Hour
It is necessary to know the video and audio bit rates configured in the Extron SMP 300
Series. For these examples, the calculations assume that the bit rates remain constant
during the recording. If using VBR (variable bit rate, which is the default) then the actual bit
rates are often slightly lower than this estimate. In some cases they can be higher.
To estimate storage per recording hour:
1. Find the SMP 300 Series video bit rate and audio bit rate, which are in kbps (kilobits per
second).
2. Insert those bit rates into the following equation:
[(video bit rate + audio bit rate) *3600 seconds per hour] / 8 bits per byte *1000 =
xMBph (megabytes per hour)
Example:
Using the default 720p High encoder preset, with
• Video bit rate = 5000 kbps
• Audio bit rate = 192 kbps
For a 1‑hour recording (3600 seconds),
• ([5000 + 192] * 3600) / 8000 = 2336.4 MBph or 2.34 GBph
For the default encoder presets of an SMP 300 Series, the following are the estimated
storage requirements for each hour of recording:
Estimated Storage Requirements
Encoder
Preset
Video bit rate
(kbps)
Audio bit rate
(kbps)
MB per hour
GB per hour
1080p High
8000 320 3744.0
3.74
1080p Low
6000 128 2757.6
2.76
720p High
5000 192 2336.4
2.34
720p Low
3000 128 1470.6
1.41
480p High
2500 128 1182.6
1.18
480p Low
1500 80 711.0
0.71
VGA High
3500 128 1632.6
1.63
VGA Low
2500 128 1182.6
1.18
SMP 300 Series
max. rates
10,000 320 4644.0
4.64
SMP 300 Series
min. rates
200 80 126.0
0.13
NOTE: If several encoding rates are chosen, do the above calculation for each of the
possible rates. Also, estimate how often each of the encoding rates is selected.
To estimate the number of hours of recordings that can be stored on a specific size of hard
drive:
• Determine the SMP 300 Series video bitrate and audio bitrate, in kbps (kilobits per
second).
• Insert those bitrates into the following equation:
[(hard drive size in GB * 8,000,000) / (video bitrate +audio bitrate)]/3600 = x hours

Extron electronics SMP 300 Series Specifications

General

Brand	Extron electronics
Model	SMP 300 Series
Category	Computer Hardware
Language	English