title: ffmpeg complex_filter fadeout not working
body: <p>Essensially what I am trying to do is concat a.mp4 with b.mp4, display my set of %c.png overlayed ontop for the entire duration of the video and also show d.png overlayed ontop but only for 1 second and then have it fade out. ALL of this works except that d.png remains overlayed and never fades out:</p>
  
  <pre><code>ffmpeg -i ./temp/a.mp4 -i media/b.mp4 -i media/splash/%c.png -i ./temp/d.png -y -filter_complex [0:v]scale=568x320,setpts=PTS-STARTPTS[v0];[1:v]scale=568x320,setpts=PTS-STARTPTS[v1];[2:v]scale=212:242,setpts=PTS-STARTPTS[v2];[3:v]trim=duration=0.5,fade=t=out:st=0:d=0.5[3:v];[v0][0:a][v1][1:a]concat=n=2:v=1:a=1[bg][a];[bg][v2]overlay=(W-w)/2:(H-h)/2,format=yuv420p[v];[v][3:v]overlay=(W-w)/2:(H-h)/2,format=yuv420p[v] -map [v] -map [a] -r 29.97 -vcodec libx264 -s 568x320 -flags +loop -b 400k -bufsize 4M -bt 256k -refs 1 -coder 0 -me_range 16 -subq 4 -partitions +parti4x4+parti8x8+partp8x8 -g 250 -keyint_min 25 -level 30 -qmin 10 -qmax 51 -qcomp 0.6 -trellis 2 -sc_threshold 40 -i_qfactor 0.71 -acodec aac -strict experimental -ab 80k -ar 48000 -ac 2 -strict experimental -f mp4 -metadata:s:v:0 rotate=90 ./temp/1428723401371.mp4
  </code></pre>
  
  <p>Lord Neckbeard, I know you're out there. I've been reading your stackoverflow posts on fade in/out with complex_filter for a few hours now and nothing I've tried has succeeded. Please Lord, accept the above as my humble offering to you and help me fadeout d.png after 1 second.</p>