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Video Encoding
Mango DSP video surveillance products support multiple video encoding options including H264, MPEG4 and MJPEG. Each Codec possesses different advantages depending on application. Mango’s devices support the ability to encode each stream in multiple resolutions and different encoders to deliver optimized video to each client application (such as live view and record).
H264
H264 video encoding provides the most efficient compression, delivering considerably more detail at a lower bitrate compared to other compression methods. Mango support the Baseline Profile (BP) of H264. Mango DSP’s H264 encoder is configured to provide low latency and high resilience to network errors.
Advantages:
Best image at the lowest bandwidth
30%-40% lower bitrate compared to MPEG4
Low end-to-end latency
Disadvantages:
Requires higher speed grade processors for encoding
Requires powerful PC to decode
Limited yet growing VMS support
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Mango H.264 Encoder Specifications | |
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ISO Standard | |
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Supported bit rate |
384KB – 4Mb per 4CIF channel |
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I Slices |
Yes |
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P Slices |
Yes |
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B Slices |
No |
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ME Range |
±144 pixels / Channel |
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Multiple Reference Frames |
No |
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ME Accuracy |
Selectable: Full Pel; Half Pel; Quarter Pel |
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Intra Modes |
All modes |
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Intra Partitioning |
16x16; 4x4 |
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Inter Partitioning |
16x16; |
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In-Loop Deblocking Filter |
Yes |
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Rate Control Modes |
CBR; VBR; Constant Quality; Constant Quantization |
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Adaptive Quantization |
Yes |
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Scene Change Detection |
No |
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CAVLC Entropy Coding |
Yes |
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CABAC Entropy Coding |
No |
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Field frames coding |
YES |
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Interlaced Coding (PAFF, MBAFF) |
PAFF only |
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Flexible Macroblock Ordering (FMO) |
No |
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Arbitrary Slice Ordering (ASO) |
No |
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Redundant Slices (RS) |
No |
MPEG-4
MPEG-4 is the most widely used video encoding used for video surveillance today. It offers excellent price/performance and is near universally supported by all VMS systems. . Mango support the Simple Profile (SP) of MPEG-4. Mango DSP’s H264 encoder is configured to provide low latency and high resilience to network errors.
Advantages:
Good video quality at reasonable bitrates
Excellent cost/performance
Near universal support by VMS
Low latency
Disadvantages
Not as efficient as H264
Key Features:
Supports 4:2:2 interleaved or 4:2:0 Input
Supports D1 30fps at 3Mbps
16x16 Motion partition based ME/MC
Configurable search range
Configurable intra frame period
CBR Rate Control
Support I and P frames
MJPEG
MJPEG is the oldest and still most commonly supported form of video compression. MJPEG is essentially a sequence of individually compressed JPEG images. Due to the extremely simple, non temporal type of compression, MJPEG offers the highest resiliency to noise, low latency while requiring minimal system resources to encode or decode. On the downside MJPEG provides significantly lower quality at every given bitrate. MJPEG is mostly used as a second encode stream, running in parallel to MPEG4 or H264, providing a low quality stream for handheld devices on noisy, low bandwidth networks.
Advantages:
Simple to implement
Low hardware requirements to encode or decode
Low latency
Works well at very low frame rates
Near perfect noise resiliency
Disadvantages:
Low video quality unless running extremely high bitrates