title: FFMPEG put creation time in output file name?
body: <p>I'm currently combining a bunch of video files together, and was wondering if I could just add the creation timestamp from the first video file to the output file name?</p>
  <p>So the file list would be</p>
  <pre><code>file-2022.02.23~17:39:29.flv
  file-2022.02.23~18:23:22.flv
  file-2022.02.23~18:55:43.flv
  file-2022.02.23~21:56:10.flv
  </code></pre>
  <p>and the converted output name would be</p>
  <p><code>file_%timestamp%.mp4</code></p>
  <p>Where %timestamp% is the creation time of the first file (file-2022.02.23~17:39:29.flv)</p>