title: tee muxer failing with error: Output file #0 does not contain any stream
body: <p>I am able to stream with ffmpeg an mp4 file with h264 encoded video and aac encoded audio to flash flv output. The command I used is:</p>
  <pre><code>ffmpeg -re -i bigbuckbunny_HD_60fps.mp4 -c copy -f flv rtmp://192.168.3.64:1935/main/stream0
  </code></pre>
  <p>When I am trying to use the tee option to duplicate the output I am failing with an error. This is the command I use:</p>
  <pre><code>ffmpeg -re -i bigbuckbunny_HD_60fps.mp4 -c copy -f tee &quot;[f=flv]rtmp://192.168.3.64:1935/main/stream0|[f=flv]rtmp://192.168.3.64:1935/main/stream1&quot;
  </code></pre>
  <p>However, it fails. What I am missing? The output I have from ffmpeg is:</p>
  <pre><code>Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'bigbuckbunny_HD_60fps.mp4':
    Metadata:
      major_brand     : isom
      minor_version   : 512
      compatible_brands: isomiso2avc1mp41
      encoder         : Lavf54.29.104
    Duration: 00:10:34.58, start: 0.000000, bitrate: 4279 kb/s
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 4141 kb/s, 60 fps, 60 tbr, 90k tbn, 120 tbc (default)
      Metadata:
        handler_name    : VideoHandler
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
      Metadata:
        handler_name    : SoundHandler
  Output #0, tee, to '[f=flv]rtmp://192.168.3.64:1935/mainconcept/obs_stream|[f=flv]rtmp://192.168.3.64:1935/mainconcept/obs_stream1':
  Output file #0 does not contain any stream
  </code></pre>