>>72276925Gomen ne.
Here's a single command with the most modern codecs/containers and some optional filters to deal with file size.
>ffmpeg -i file.abc -map 0:v -c:v libvpx-vp9 -crf 45 -b:v 0 -vf "fps=30,scale=iw*.75:-1" output.webm -map 0:a -c:a libopus -b:a 128k output.opus