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A simple server that mixes audio from one or more RTSP streams (e.g. IP cameras) and then re-exports them as a web page.

Open said web page in any old browser (on your computer, your phone, whatever), start it going, and leave it running in the background.

I use this as a baby monitor.

• I have an Ubiquiti Unifi camera setup.
• Each camera can be configured to export an RTSP stream on the local network.
• I have two kids. Each has a camera in their room.
• I can leave the audio stream running in the background on my phone while I walk around the house, or when the phone is charging on my nightstand.

Because:

1. Wireless baby monitors that do not use the network don't have enough range to reach across my house.
2. Most network-able baby monitors phone home to a cloud service. I want an all-local setup.

• The server uses ffmpeg to pull from the RTSP streams. It continuously decodes each camera's audio channel into a ring buffer (even when no clients are connected -- it's pretty cheap TBH).
• When a client connects, the audio channels are mixed and then encoded with ffmpeg.
• Some overcomplicated JavaScript tricks the browser into not buffering. (Otherwise, by default the browser's<audio> element implementation wants to buffer like 10 seconds before it will start playing, wtf.)