Estimating Storage Requirements For A Recording; Estimating Storage Per Recording Hour - Extron electronics SMP 300 Series User Manual

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.
2.
Example:
Using the default 720p High encoder preset, with
•
•
For the default encoder presets of an SMP 300 Series, the following are the estimated
storage requirements for each hour of recording:
Encoder
Preset
1080p High
1080p Low
720p High
720p Low
480p High
480p Low
VGA High
VGA Low
SMP 300 Series
max. rates
SMP 300 Series
min. rates
NOTE: If several encoding rates are chosen, do the above calculation for each of the
To estimate the number of hours of recordings that can be stored on a specific size of hard
drive:
•
•
Find the SMP 300 Series video bit rate and audio bit rate, which are in kbps (kilobits per
second).
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)
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
Estimated Storage Requirements
Video bit rate
(kbps)
8000
6000
5000
3000
2500
1500
3500
2500
10,000
200
possible rates. Also, estimate how often each of the encoding rates is selected.
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
Audio bit rate MB per hour
(kbps)
320 3744.0
128 2757.6
192 2336.4
128 1470.6
128 1182.6
80 711.0
128 1632.6
128 1182.6
320 4644.0
80 126.0
SMP 300 Series • Reference Information
GB per hour
3.74
2.76
2.34
1.41
1.18
0.71
1.63
1.18
4.64
0.13
159