To the Hungary anon that wanted the bash function:
place this inside your .bshrc or .zshrc
It includes 2 functions, pretty self explainatory
Call the function + filename and it will convert it. There's also one to remove audio
https://pastebin.com/RV5HxVMN
Every one of them is invoked by function name + a file.
Please, let me know if this reaches you or I will keep posting it every few times