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Video Decoder Suggestion For 4 Analog Cameras

Category: Hardware
Software Version: Linux

Hello, we will be using 4 analog NTSC cameras and we want a decoder which can split the screen into 1,2 or 4 by choice. Decoder output will be passed to an application process (linux) and application will be surround view so can anyone suggests a decoder that can fit for our needs? Thank you in advance.