Vivotek VS8801 User Manual page 93

If you enalbe the adaptive recording and enable time-shift cache stream on Camera A, only when an
event takes place on Camera A will the server records the streaming data at the full frame rate. This
methodology only requires transferring the Intra frame data during normal operation, and full-frame-rate
videos in the occurrences of events, and thus saving users of network bandwidth and storage space.
Bandwidth
I frame ---> Full frame rate ---> I frame
Bandwidth
Activity Adaptive Streaming
for Dynamic Frame Rate Control
The alarm trigger includes: motion detection and DI dection. Please refer to Event settings on page 87.
■ Pre-event recording and post-event recording:
The Video Server has a buffer area; it temporarily holds data up to a certain limit. Enter a number to
decide the duration of recording before and after a trigger is activated.
■ Priority: Select the relative importance of this recording (High, Normal, or Low). Recording with a higher
priority setting will be executed first.
■ Source: Select a stream as the recording source.
NOTE:
► To enable adaptive recording, please make sure you have setup the triggering sources such as
Motion Detection, DI devices, or Manual Triggers.
► When there is no alarm trigger:
- JPEG mode: records 1 frame per second.
- H.264 mode: record one I frame only.
- MPEG-4mation.
► When the I frame period is <1s on Video settings page, it should be forced to make the I frame period
to 1s when adaptive recording is activated.
► To enable adaptive recording, please also enable time shift caching stream and select a caching
stream on page 56, Audio and Video settings.
► To enable recording notification please configure Event Settings first. Please refer to page 79.
Continuous recording
Time
VIVOTEK
User's Manual - 93