Display the frame rate of a video

Multimedia stream analyzer.
More information: <https://ffmpeg.org/ffprobe.html>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

ffprobe -v error -select_streams v:0 -show_entries stream=avg_frame_rate -of default=noprint_wrappers=1:nokey=1 {{input.mp4}}

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