Spyclops SPY-DVR Kit (ALL KITS) User Manual User Manual
Page 8
8
•
Bitrate mode: This will be dependant on your bandwidth and specific needs
Constant Bitrate
This is the default encoding mode, and
also the most basic. In this mode, the
bitrate will be the same for the whole file.
It means that each part of your video file
will be using the same number of bits.
The complex parts will be of a lower
quality than the easiest ones. The main
advantage is that the final files size won't
change and can be accurately predicted.
This mode is not recommended
Average Bitrate
In this mode, you choose a target bitrate
and the encoder will try to constantly
maintain an average bitrate while using
higher bitrates for the parts of your video
that need more bits. The result will be of
higher quality than CBR encoding while
the average file size will remain
predictable, so this mode is highly
recommended over CBR.
Variable Bitrate
In this mode, you choose the desired
quality on a scale going from 9 (lowest
quality/highest distortion) to 0 (highest
quality/lowest distortion). Then you
choose the optimal number of bits to
spend for each part. The advantage is that
you are able to specify the quality level
that you want to reach; the inconvenient
is that the final file size is totally
unpredictable.
•
Encode format: For the main stream we recommend NTSC with D1 format
QCIF
CIF
HD1
D1
NTSC
176 x 120
352 x 240
352 x 480
704 x 480
PAL
176 x 144
352 x 288
352 x 576
704 x 576
•
Rate: In general, we recommend a bitrate of around 2 - 2.5 Mbps, which takes into account the average
worldwide broadband connections for video output
•
Quality: You can adjust your image quality fluctuation. Highest, High, Medium, Low, Lowest. Highest is
recommended, although it will effect your bandwidth
•
Frame rate: The frame rate is how many unique consecutive images are displayed per second in the video
to give the illusion of movement. Keep in mind, that the minimum limit that our brain needs to perceive
moving frames as a video is 24 Frames per Second, so there is no big difference between 24 and 30 fps
except the higher frame rate will effect your bandwidth and data storage