title: My FFMPEG converter is not allowing mp4 to webm conversions.
body: <p>heres the command:</p>
  
  <pre><code>ffmpeg -i videos/test.mp4 -c:v libvpx -level 216 -profile 0 -qmax 42 -qmin 10 -c:a libvorbis -f webm out.webm
  </code></pre>
  
  <p>i keep getting this error:</p>
  
  <pre><code>Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
  </code></pre>
  
  <p>here is the full response</p>
  
  <pre><code># ffmpeg -i videos/test.mp4 -c:v libvpx -level 216 -profile 0 -qmax 42 -qmin 10 -c:a 
  
  libvorbis -f webm out.webm
  ffmpeg version N-49225-g7e059c9 Copyright (c) 2000-2013 the FFmpeg developers
    built on Jan 24 2013 05:14:06 with gcc 4.1.2 (GCC) 20080704 (Red Hat 4.1.2-54)
    configuration: --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvpx --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-gpl --enable-postproc --enable-nonfree
    libavutil      52. 15.101 / 52. 15.101
    libavcodec     54. 90.100 / 54. 90.100
    libavformat    54. 61.104 / 54. 61.104
    libavdevice    54.  3.102 / 54.  3.102
    libavfilter     3. 33.100 /  3. 33.100
    libswscale      2.  2.100 /  2.  2.100
    libswresample   0. 17.102 /  0. 17.102
    libpostproc    52.  2.100 / 52.  2.100
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'videos/test.mp4':
    Metadata:
      major_brand     : mp42
      minor_version   : 1
      compatible_brands: mp42avc1
      creation_time   : 2010-08-12 15:42:21
    Duration: 00:00:34.20, start: 0.000000, bitrate: 358 kb/s
      Stream #0:0(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 100 kb/s
      Metadata:
        creation_time   : 2010-08-12 15:42:21
        handler_name    : Apple Sound Media Handler
      Stream #0:1(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 640x320, 251 kb/s, 29.97 fps, 29.97 tbr, 2997 tbn, 5994 tbc
      Metadata:
        creation_time   : 2010-08-12 15:42:21
        handler_name    : Apple Video Media Handler
  Please use -profile:a or -profile:v, -profile is ambiguous
  File 'out.webm' already exists. Overwrite ? [y/N] y
  v0.9.6
  [libvpx @ 0x7e38d20] Failed to initialize encoder: ABI version mismatch
  Output #0, webm, to 'out.webm':
    Metadata:
      major_brand     : mp42
      minor_version   : 1
      compatible_brands: mp42avc1
      Stream #0:0(eng): Video: vp8, yuv420p, 640x320, q=10-42, 200 kb/s, 90k tbn, 29.97 tbc
      Metadata:
        creation_time   : 2010-08-12 15:42:21
        handler_name    : Apple Video Media Handler
      Stream #0:1(eng): Audio: none, 44100 Hz, stereo, fltp
      Metadata:
        creation_time   : 2010-08-12 15:42:21
        handler_name    : Apple Sound Media Handler
  Stream mapping:
    Stream #0:1 -&gt; #0:0 (h264 -&gt; libvpx)
    Stream #0:0 -&gt; #0:1 (aac -&gt; libvorbis)
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
  </code></pre>
  
  <p>does anybody have any idea whats going on? I am completely lost. I have tried so many different commands. converting from mp4 to ogg works fine, and i have had mp4 to webm working before, but i reinstalled ffmpeg to get the mp4 to ogg working and now ive lost my mp4 to webm conversions. >.&lt; this whole installation process is such a damn nightmare. does anyone havea  good tutorial for centos installation of ffmpeg that will work for mp4 ogg and webm? I have used the centos tut that came off of the ffmpeg site, but it failed me. If anyone has any ideas that could point me in the right direction i would much appreciate it!</p>