What does "dash" - mean as ffmpeg output filename

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I'm trying to use ffmpeg with gnuplot to draw some audio spectra, I'm following this ffmpeg doc link.

Now I'm asking what "dash" - means on this line right after -f data, it should be a filename: the last element of ffmpeg command should the output file but I have no files named - in the directory after running the command.

ffmpeg -y -i in.wav -ac 1 -filter:a aresample=8000 -map 0:a -c:a pcm_s16le -f data - | gnuplot -p -e "plot '<cat' binary filetype=bin format='%int16' endian=little array=1:0 with lines;"

I looked on ffmpeg docs but I didn't find anything.

spectrogram ffmpeg parameters
1 Answers

- on the output side means stdout. You can also write pipe:1 in its place. As input, it means stdin and can be written as pipe:0.

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