Aerospace telemetering video variable frame rate acquisition method, device and system

The embodiment of the invention provides a variable-frame-rate video acquisition method, device and system for spaceflight telemetering, and the method comprises the steps: collecting video frames in real time at a first frame rate, and obtaining original video frames; caching the original video frames collected in a period of time; specific peripheral signals on a rocket body are collected in real time, and the cached original video frames are controlled to be output in a first frame rate mode or a second frame rate mode according to whether the specific peripheral signals are collected or not; wherein the second frame rate is smaller than the first frame rate; and encoding the output video frame to obtain encoded data, and transmitting the encoded data to a video receiving end device. According to the method, the video frames in a period of time are cached, so that the resolution of the video image can be improved on the premise of maintaining the average code rate of the original video, namely, the bandwid