I haven’t tried ffmpeg on Jetson as gstreamer was good-enough for my tests. I believe that Paul’s suggestion was to try and complile the repo below.
There’s a compilation guide here:
https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu
Here’s an example from Paul about using ffmpeg.
Examples - RICOH THETA Development on Linux
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Live Streaming over USB on Ubuntu and Linux, NVIDIA Jetson - #117 by Paul_Gullett