You can download
ffmpeg compressed file from this link.
After downloading it, extract it, then upload the
ffmpeg file inside to your repl.it project.
You can also use the below
shellapproach to download and unzip
ffmpegbinaries on your repl.
And then extract the archive.
tar -xf ffmpeg-release-i686-static.tar.xz
And then allow the files to read & write files on the server.
chmod +777 ./ffmpeg-release-i686-static
And that's all, now you are ready to go.
into the shell.