title: What Is the Difference Between asetpts and atempo in FFmpeg Audio Filters?
body: <p>I have been using FFmpeg to slow down or speed up video files (with audio). It seems that to speed up a video, <code>setpts=0.5*PTS</code> should be used. However, when speeding up an audio, <code>asetpts=0.5*PTS</code> and <code>atempo=2.0</code> are both available. What is the difference between these two options? Which is the better option? </p>