VLC Media Player

1. Abra o VLC.

2. Vá em Media > Open Network Stream.

3. Insira a URL RTSP, como:

  rtsp://admin:123@192.168.0.1:554/Streaming/Channels/401

4. Clique em Play para visualizar o stream.

Ffmpeg

1. Abra o Terminal e execute o comando

  ffmpeg -i "rtsp://admin:123@192.168.0.1:554/Streaming/Channels/401" -c copy output.mp4

Necessário alterar a URL