title: Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used) in ubuntu16.04 in docker container
body: <p>I am using a Docker container in which I installed Ubuntu 16.04.  I tried to setup IOT based people_counter Project so i install OpenVINO Toolkit, and after installing i run the command and at last I got the following error when I Build and start the main application that does people counting using deep learning inference.</p>
  
  <p>I run the program: </p>
  
  <pre><code>./obj_recognition \
        -i Pedestrain_Detect_2_1_1.mp4 \
        -m /opt/intel/computer_vision_sdk/deployment_tools/intel_models/person-detection-retail-0012/FP16/person-detection-retail-0012.xml \
        -l /opt/intel/computer_vision_sdk/deployment_tools/intel_models/person-detection-retail-0012/FP16/person-detection-retail-0012.bin \
        -d GPU \
        -t SSD \
        -thresh 0.7 0 \
        2&gt;/dev/null \
    | ffmpeg \
        -v warning
        -f rawvideo
        -pixel_format bgr24
        -video_size 544x320
        -i -
        http://localhost:8090/fac.ffm
  </code></pre>
  
  <p>and I got this:     </p>
  
  <pre><code>Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)
  </code></pre>
  
  <p>What can I do?</p>
  
  <p>Edit:
  After  <a href="https://stackoverflow.com/users/224132/peter-cordes">Peter Cordes</a> sugestion </p>
  
  <p>removing -v warning i run the command and i got this  :</p>
  
  <pre><code> libavutil      54. 31.100 / 54. 31.100
   libavcodec     56. 60.100 / 56. 60.100
   libavformat    56. 40.101 / 56. 40.101
   libavdevice    56.  4.100 / 56.  4.100
   libavfilter     5. 40.101 /  5. 40.101
   libavresample   2.  1.  0 /  2.  1.  0
    libswscale      3.  1.101 /  3.  1.101
     libswresample   1.  2.101 /  1.  2.101
    libpostproc    53.  3.100 / 53.  3.100
  Input #0, rawvideo, from 'pipe:':
    Duration: N/A, bitrate: 104448 kb/s
     Stream #0:0: Video: rawvideo (BGR[24] / 0x18524742), bgr24, 544x320,   104448 kb/s, 25 tbr, 25 tbn, 25 tbc
   Output #0, ffm, to 'http://localhost:8090/fac.ffm':
   Metadata:
    creation_time   : 2018-09-05 06:55:30
    encoder         : Lavf56.40.101
     Stream #0:0: Video: mjpeg, yuv420p, 852x480, q=2-31, 8192 kb/s, 25 fps,  1000k tbn, 25 tbc
    Metadata:
      encoder         : Lavc56.60.100 mjpeg
   Stream mapping:
     Stream #0:0 -&gt; #0:0 (rawvideo (native) -&gt; mjpeg (native))
   frame=    0 fps=0.0 q=0.0 Lsize=       4kB time=00:00:00.00 bitrate=N/A    
    video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
    Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)
  </code></pre>