title: Select FrameSize for video with logo in FFmpeg
body: <p>I'm using this command to stream video with 1920*1080 frame size:</p>
  
  <pre><code>ffmpeg -re -i test.mp4 -vf scale=1920*1080 -f mpegts udp://127.0.0.1:port
  </code></pre>
  
  <p>but when I want to stream images with video like this:</p>
  
  <pre><code>ffmpeg -re -i test.mp4 -vf scale=1920*1080 -i logo.png -ignore_loop 0 -i 
  test6.gif -filter_complex "[0][1]overlay=10:10[a];[a][2]overlay=90:90" -f 
  mpegts udp://127.0.0.1:port
  </code></pre>
  
  <p>the command line display this error: <a href="http://i.stack.imgur.com/lK8IE.png" rel="nofollow">here</a></p>
  
  <p>How can I choose frame size when I stream video with image? </p>