Digital Watchdog DWC-MPV85WiATW, User Manual, Page: 21 / 89

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GOP(Group of Pictures) Ɛ ize - Setup the number of frames (P-frame) which contain only changed information based on basic
frame (I-frame). &ŽƌĂƌĞĂƐǁŝƚŚ lots of movement, ƚŚĞďŝŐŐĞƌƚŚĞ'KWǀĂůƵĞŝƐ͕ only the number of P-frames is bigger. As a
result, video resolution will be low but ‘ Ĩ ile size’ and ď it-rate ǁŝůů decreased.
GOP(Group of Pictures) Ɛŝ ze i Ɛ͗
I-frame and P-frame can be created for ,͘Ϯϲϱ;,sͿ͕ H.264 and DW'ϰ video compression. I-frame(=key-frame) means
the ǁŚŽůĞŝŵĂŐĞĚĂƚĂĨŽƌŽŶĞƐƉĞĐŝĮĐƐĐĞŶĞŽĨǀŝĚĞŽ͘WͲĨƌĂŵĞŝƐŝŵĂŐĞĚĂƚĂǁŚŝĐŚŚĂƐďĞĞŶĐŚĂŶŐĞĚŝŶĨŽƌŵĂƚŝŽŶ
ĐŽŵƉĂƌĞĚ to I-frame GOP is made up of one I-frame and corresponding several P-frames. To improve video quality, set the
number of P-frames smaller and to decrease image size, set the number of P-frames bigger.
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WƌŽĮůĞͲ dŚĞƉƌŽĮůĞĚĞĮŶĞƐƚŚĞƐƵďƐĞƚŽĨďŝƚƐƚƌĞĂŵĨĞĂƚƵƌĞƐŝŶ,͘Ϯϲϱ;,sͿŽƌ,͘ϮϲϰƐƚƌĞĂŵ͕ŝŶĐůƵĚŝŶŐĐŽůŽƌƌĞƉƌŽĚƵĐƚŝŽŶĂŶĚ
additional video compression.
H.264: Main, High / H.265 (HEVC): Main
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Smart ď itrate Đ ontrol
^ĞƚƵƉͲsŝĚĞŽĂŶĚĂƵĚŝŽƐĞƚƵƉ
Video Đ onfiguration
Main - ŶŝŶƚĞƌŵĞĚŝĂƚĞƉƌŽĮůĞǁŝƚŚĂŵĞĚŝƵŵĐŽŵƉƌĞƐƐŝŽŶƌĂƚŝŽ͘dŚĞŵĂŝŶƉƌŽĮůĞƐƵƉƉŽƌƚƐ/ͲĨƌĂŵĞƐ͕WͲĨƌĂŵĞƐ͕ĂŶĚͲĨƌĂŵĞƐ͘
High - ĐŽŵƉůĞdžƉƌŽĮůĞǁŝƚŚĂŚŝŐŚĐŽŵƉƌĞƐƐŝŽŶƌĂƚŝŽ͘dŚĞŚŝŐŚƉƌŽĮůĞƐƵƉƉŽƌƚƐ/ͲĨƌĂŵĞƐ͕WͲĨƌĂŵĞƐ͕ĂŶĚͲĨƌĂŵĞƐ͘
KīͲ ^ mart ď itrate Đ ontrol function ŝƐĚŝƐĂďůĞĚ͘
CVBR ( Ĩ ramerate priority) - This Mode is for cameras which do not want any frame drop, but still want to get Ă lower
bitrate. t hen the ƚ arget bitrate is set to be very low, ĞǀĞŶƚƐǁŝƚŚŚŝŐŚŵŽƚŝŽŶŵĂLJĂƉƉĞĂƌ very noisy.
CVBR ( Ƌ uality priority) - When the ƚĂ rget bitrate is set to ďĞ very low, ĂŶĚĂŶĞǀĞŶƚǁŝƚŚŚŝŐŚŵŽƚŝŽŶŽĐĐƵƌƐ͕ LBR will
try to drop frames, ŵĂŬŝŶŐƚŚĞĮŶĂůĨƉƐůŽǁĞƌ͕ŵĂŬŝŶŐƚŚĞŽƵƚƉƵƚĨƌĂŵĞƐƚŽŚĂǀĞďĞƚƚĞƌƋƵĂůŝƚLJ͘
CBR - This ŵ ode is close to traditional security IPCAM, and it ŝ s not designed for LBR ͘ It ŝ s provided as an option in LBR library to
help comparison.
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