Q1: What is the difference between a modulator-demodulator module set and a video encoder-decoder?

A1: Modulators and demodulators are communication signal processing devices, and video encoders and video decoders are video signal compression processing devices.

Q2: Do you have any two-way communication modulator-demodulator module?

A2: Yes, we have, please check the below link, it is used for our long-range wireless video transmitter and receiver with AES-256 encryption and decryption. https://ivcan.com/p/two-way-wireless-transmission-digital-data-video-link/ Highly integrated, simpler operation, and more powerful.