Milestone XProtect Essential 2014 - Manual (Page 87)

Milestone XProtect ® Essential 2014 Administrator's Manual
www.milestonesys.com 87 Advanced configuration
Name Description
Never
Never record audio on any cameras. Note that even though audio is
never recorded, it is still be possible to listen to live audio in the
Smart Client.
If you record audio, it is important that you note the following:
 Audio recording affects video storage capacity: Audio is recorded to the associated camera’s
database. Therefore, it is important to bear in mind that the database is likely to become full
earlier if you record audio and video than if you only record video. The fact that the database
becomes full is not in itself a problem since your system automatically archives (see "About
archiving" on page 118) data if the database becomes full. However, you may need additional
archiving space if you record audio.
o Example: If you use MPEG4, each one-second video GOP (Group Of Pictures) are stored
in one record in the database. Each second of audio will also be stored in one record in the
database. This reduces the database’s video storage capacity to half its capacity, because
half of the database’s records is used for storing audio. Consequently, the database runs
full sooner, and automatic archiving takes place more often than if you were only recording
video.
o Example: If you use MJPEG, audio is stored in one record for every JPEG for as long as
the audio block size does not exceed the time between the JPEGs. In extreme cases, this
reduces the da
tabase’s video storage capacity to half its capacity, because half of the
database’s records is used for storing audio. If you use very high frame rates, which
means less time between each JPEG, a smaller portion of the database is used for storing
audio records, and consequently a larger portion is available for storing video. The result is
that the database runs full sooner, and automatic archiving takes place more often than if
you were only recording video.
Above examples are simplified. The exact available video storage capacity also depends on
GOP/JPEG and audio kilobyte size.
Storage information
The storage information properties show how much storage space you have on your system and how
much of it is free. To quickly view disk space usage in a pie chart format, select the line representing
the drive you are interested in.
Name Description
Drive Letter representing the drive in question, for example C:.
Path
Path to where you save the files, for example C:\ or
\\OurServer\OurFolder\OurSubfolder\ .
Usage
What the storage area is used for, for example recording or
archiving.
Drive Size Total size of the drive.
Video Data Amount of video data on the drive.
Other Data Amount of other data on the drive.