Somewhat better support for floating point audio and WMA. Some of the problems I encountered:
* The channel layout was not set properly for WMA. I now use av_get_default_channel_layout as a work around.
* Video queue size was too small for some movies to start playing, especially the notorious badly encoded "Nature.wmv" sample movie.
* swr_convert requires the data size to be expressed in samples per channel, not in bytes.
* Removed Cinder audio header, as it wasn't used but still prevented the sample to work on vc11.
* AudioFrame is not the owner of the data, which turned out to be problematic. Now, I copy the passed audio data to its own buffer.
Updated to the latest FFmpeg build (at the time of this commit). Now also compiles on vc11 (vs2012).
Added compatibility for more audio formats.
Updated README.md