I'm trying to connect an RCA composite video cable to an Android phone (Samsung Galaxy S6, specifically). My use case is this: I have a small camera that transmits composite video for use in FPV mode in RC aircraft. On the video receiver, the output is analogue composite video via an RCA out cable/connector. I want to connect this RCA cable to the Android phone to play the (live) video stream.
I can see various connectors on shopping sites such as these:
But it's not 100% clear to me if these will work as most of these seem to be designed for the opposite use case: people more commonly want to connect their phone to their TV and OUTPUT video from their phone to their TV. I want to do the opposite (INPUT video into my phone), and it's not clear if these types of devices will support this.
What is the best solution to enable what I want to do? I'd ideally prefer one device/connector rather than chaining multiple adapters together, but I'll do whatever needs to be done as long as I'm certain it will work.