How to convert video file without extension using FFMPEG?

Question

Ruby on Rails

In a rail application, I use the standard ActiveStorage file uploader.
It applauds files while removing the extension.
How can I tell FFMPEG to take a specific file without extension as source video?

Answer 1

ffmpeg has a -f switch that allows you to explicitly specify the format. The list of formats is obtained with the -formats command. So no need to rename.