title: ffmpeg --help, node child_process spawn trigger stderr
body: <p>So I simply run <code>ffmpeg --help</code> using node.js, why is there <code>stderr</code>? I think it should be only <code>stdout</code>. Is it an issue of ffmpeg or node.js?</p>
  <p>Code:</p>
  <pre><code>import path from 'path';
  import {spawn} from 'child_process';
  
  const childProcess = spawn(path.join(__dirname, 'ffmpeg'), ['--help']);
  childProcess.stderr.setEncoding('utf-8');
  childProcess.stderr.on('data', data =&gt; {
    console.log('stderr:');
    console.log(data);
  });
  </code></pre>
  <p>Output:</p>
  <pre><code>stderr:
  ffmpeg version 4.4-tessus  https://evermeet.cx/ffmpeg/  Copyright (c) 2000-2021 the FFmpeg developers
    built with Apple clang version 11.0.0 (clang-1100.0.33.17)
    configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay
  
  stderr:
    libavutil      56. 70.100 / 56. 70.100
    libavcodec     58.134.100 / 58.134.100
    libavformat    58. 76.100 / 58. 76.100
    libavdevice    58. 13.100 / 58. 13.100
    libavfilter     7.110.100 /  7.110.100
    libswscale      5.  9.100 /  5.  9.100
    libswresample   3.  9.100 /  3.  9.100
    libpostproc    55.  9.100 / 55.  9.100
  </code></pre>