FFmpeg is one of the prime examples of open-source software, but a lot depends on the 3rd party libraries it uses. I tried using my Android phone to convert my

FFmpeg is one of the prime examples of open-source software, but a lot depends on the 3rd party libraries it uses. I tried using my Android phone to convert my videos from H.264 to HEVC (H.265) for storage, but it was ~3.5 times slower in comparison to x86 CPUs, in terms of frames encoded per second per watts of power consumed (FPS/Watt): https://quanticdev.com/articles/h265-encoding-on-arm-cpus https://quanticdev.com/articles/h265-encoding-on-arm-cpus Though still, I can't even imagine attempting this test without FFmpeg in the first place. It is available directly in Termux on Android.