I needed the stream URL when casting video — so I built a fake TV

A Python script, wechat-finder-dlna, was created to capture the stream URL when casting video from a phone to a TV. This is useful for recording or playing the stream on a laptop. The script pretends to be a TV on the local network, and any app that supports DLNA casting will send the real stream URL. The script has no dependencies and can be used as a command-line tool or a library. Phone and computer must be on the same WiFi.