The Monarch supports HDMI audio/video input only. And without HDCP.
To stream from a composite video source you must use a composite-to-HDMI converter. Simply connect the HDMI-out from the converter to to the HDMI in of the Monarch.
However, many converters do not deal with audio sample rates very well. If you have out-of-sync audio/video we recommend that you use the converter for video, but plug the analog audio directly into the blue mini-jack on the Monarch. To configure the encoder to use this audio source, log in to the Monarch and select Settings / Audio, and select Analog from the dropdown list and Apply.
Connect audio using a mini-jack to RCA adapter if needed: