Rate Control
The rate control setting determines the bit rate and quality of each frame in the video stream. There might be a
CBR: The constant bit rate (CBR) streams video at a fixed number of bits per second. CBR uses the full capacity of the bit rate setting for scenes with or without motion. Video is always streamed at the user bit rate setting.
CVBR: The constrained variable bit rate (CVBR) sets a target bit rate like CBR, but allows the bit rate to drop below the specified value on simple scenes. This rate control still provides predictable maximum storage needs with complex scenes, while using less storage with simple scenes. CVBR is the default rate control setting.
Profile
The profile defines the subset of bit stream features in an H.264 stream, including color reproduction and additional video compression. It is important that the selected profile is compatible with the recording device so that stream can be decoded and viewed.
Baseline: A simple profile with a low compression ratio. A baseline profile is compatible with more recorders but uses more bits to compress quality video than the other profiles. This profile supports
Main: An intermediate profile with a medium compression ratio. Main is the default profile setting. This profile is compatible with most recorders and uses fewer bits to compress video than the baseline profile; however, it uses more bits than the high profile.The main profile supports
High: A complex profile with a high compression ratio. This is the primary profile for
GOP Structure
The group of pictures (GOP) structure is the sequence in which frames are placed within a video stream. The GOP structure always includes
Each GOP structure starts with an
The camera can be configured to use one of the following GOP structures:
IP: A compression that uses only
IBBrBP: The most sophisticated H.264 compression available. IBBrBP provides the highest quality image at a given bit rate, but it also increases the latency of the video and requires more processing power for decoders.
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