I go over two techniques in FFmpeg to turn a long video into a “timelapse”. One is to speed up the video. The second is to take every n-th frame of video. The second method simulates a traditional timelapse where you record a series of photos. I go over the pros and cons of each technique.
In this video, I install Soapy Remote SDR server on a Raspberry Pi 4 with an RTL-SDR Blog V3 USB dongle. I then connect to the server on a separate computer running CubicSDR.