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The benefit is that you and other Rust developers could potentially implement improvements to FFMPEG. Again, if you stick to porting only the top layer of FFMPEG - the media processing framework with the CLI - you can still keep the rest as C and link it all together in a build. Your Rust version (and any improvements implemented by other Rust developers who contribute to wedeo) can easily be converted back to C so that patches could be offered back upstream to the main FFMPEG project.