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I want to find video file duration only with ffprobe but
ffprobe FILENAME.EXT 2| find "Duration:"
does not filter output to show just the line with "Duration:" Instead, I got:
Argument '2' provided as input filename, but 'FILENAME.MP4' was already specified.
How do I see just the duration of a file from the Windows command prompt?
First, if you just want information about a file, you should probably use "ffprobe", not "ffmpeg". Otherwise you'll get an answer, but you'll also have an error return status.
As to your real question: By convention, ffmpeg reserves STDOUT for binary video and audio data only. Everything else, including all the possible kinds of informative text, is sent to STDERR.
So, try changing your code to:
ffprobe FILENAME.EXT 2| find "Duration:" (for a *nix shell)
or
ffprobe.exe FILENAME.EXT 2>&1 | findstr Duration (for a Windows shell)
