How to convert files from folders in FFmpeg macOS?

Question

macOS

There is a folder with a serial that needs to be converted to .mp4. Series in both .avi and .mkv. Please tell me the command for FFmpeg (terminal version). Thank you.

PS There is a folder with a series, which has subfolders with seasons.

Answer 1

find ./directory -name "*.avi" -o -name "*.mkv" -exec ffmpeg -i {} {}.mp4  \;