Sometimes you want ffmpeg to ask you whether it should overwrite a file. Sometimes it's just a script that you prefer would fail if something is amiss. I.e. don't rely on stdin to answer if you have a question.
See https://ffmpeg.org/ffmpeg.html#Main-options
-stdin
- Enable interaction on standard input. On by default unless a pipe is detected.
-nostdin
- To explicitly disable console interactions. Without -y
this will cause ffmpeg to error out if the target file exists.
-y
- To overwrite the output file
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