Another MediaEngine sample

Hello,

Just added a second very simple example (based on audio media engine), which also plays video.

Please note that media engine on NVidia is really buggy (if it even works). So playback on those card will just likely crash.

https://devtalk.nvidia.com/default/topic/524892/directx-and-direct-compute/why-imfmediaengine-transfervideoframe-return-e_fail-and-throw-a-exception-on-gts-250-on-64-bit-wind/

Thanks
Julien