User's Manual

NETNode
Phase 1 and 2 Units
NETNode
User Manual
NETNode-V2.3
5-71
DS000034 Unclassified
For example to set a continuous recording of the last 5 minutes of encoded video the user
would set the number of chunks to 10 and this would continuously record and overwrite the
last 10 minutes of video.
With a 1Mbps video stream and a 2GB SD card a user should be able to record just over 4
hours of video data.
1Mbitps is equivalent to 125kBytes/second of data. A 2GByte SD card can store 16,000
seconds of video before it hits capacity or 533 30 second chunks.
To leave a safe margin a 500 chunk limit should be used giving just over 4 hours of
recording if recording a 1Mbps video stream.
5.4.3. Playing back the recorded data
The record data may be viewed directly with a player such as VLC media player using the
following RTSP url:
rtsp://<ip_address_of_AVI_unit>/record.sdp
In this mode of operation the slider bar on VLC may be moved to navigate to different parts
of the recording. Note play will always commence on the next 30 second chunk. The NTP
timestamps in the data contain the time the recording was transferred to SD card.
5.4.4. Transferring the files
Individual recorded files may be transferred to the PC using the Web interface to download
the files. To perform this operation, simply right click on the file.
The SD card may also be removed and inserted into a card slot on the PC to read the files.
The SD card format is FAT16 with the date stored in UTC format.