title: ffmpeg combine 2 filters (with lavfi, -vf and -complex_filter)
body: <p>I have 2 working code's but can't combine them (they both work separately).</p>
  
  <pre><code>ffmpeg -i video.mp4 -i audio.mp3 -shortest -t 8 -vf "lutrgb=r=1.5, crop:500:500" output.mp4
  
  ffmpeg -i video.mp4 -f lavfi -i "color=Red:s=1280x720" 
  -filter_complex "[0:v]setsar=sar=1/1[s];
  [s][1:v]blend=shortest=1:all_mode=overlay:all_opacity=0.7[out]" 
  -map [out] -map 0:a output.mp4
  </code></pre>
  
  <p>the lutrgb will be replaced but the color overlay so we can remove that.
  endresult will take video, audio, color overlay, crop it to 1:1 and duration length of video.</p>
  
  <p>Thanks
  Felix</p>