Batch file that you can drag and drop multiple files onto and execute commands. Loops through all files, calls ffmpeg with file as input, and file with "_clip" inserted before the extension.
:again
if "%~1" == "" GOTO done
D:\Applications\ffmpeg\bin\ffmpeg.exe -i "%~1" -t 00:00:30 "%~n1_clip%~x1"
SHIFT
GOTO again
:done
Use @pause
to keep cmd open after the script executes.
https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-xp/bb490909(v=technet.10)
%~I Removes any surrounding quotation marks ("").
%~fI Fully qualified path name.
%~dI Drive letter only.
%~pI Path only.
%~nI File name only.
%~xI File extension only.