Why use HAVE_VAAPI_DRM in the libyami.cpp

[zackxue]

The HAVE_VAAPI_DRM enable use the DRM instead of X11 ? can i change it to X11?

[mypopydev]

@zackxue Yes, you can use X11, but I think you need to change the code and re-build the ffmpeg_libyami source code, another question, why you prefer X11 than DRM?

[zackxue]

Refer #23, the AV_PIX_FMT_YAMI default is DRM, can not putsurface.