The following files have MPC-BE specific custom code (compared to ffmpeg):

* config.h
* config.asm
* ffmpeg.mak

* libavcodec/x86/hevcdsp.h
* libavcodec/x86/hevcdsp_init.c

* libavcodec/allcodecs.c
* libavcodec/avcodec.h
* libavcodec/error_resilience.c
* libavcodec/h264.c
* libavcodec/h264.h
* libavcodec/h264_ps.c
* libavcodec/h264_slice.c
* libavcodec/hevc.c
* libavcodec/hevc.h
* libavcodec/hevc_parse.c
* libavcodec/hevc_parser.c
* libavcodec/hevc_refs.c
* libavcodec/hevcpred.c
* libavcodec/hevcpred.h
* libavcodec/internal.h
*.libavcodec/libdcadec.c 
* libavcodec/mpeg12dec.c
* libavcodec/mpegaudio_parser.c
* libavcodec/mpegpicture.c
* libavcodec/mpegvideo.c
* libavcodec/options.c
* libavcodec/utils.c
* libavcodec/vc1.h
* libavcodec/vc1dec.c
* libavcodec/vorbis.c

* libavfilter/allfilters.c 

* libavutil/common.h
* libavutil/eval.c
* libavutil/file_open.c
* libavutil/internal.h
* libavutil/mathematics.h

======
The following files are available only in MPC-BE (compared with ffmpeg):

* config.c

* libavcodec/x86/hevc_idct_intrinsic.c
* libavcodec/x86/hevc_intra_intrinsic.c
* libavcodec/x86/hevcpred.h

* libavcodec/dxva_h264.h
* libavcodec/dxva_hevc.h
* libavcodec/dxva_internal.h
* libavcodec/dxva_mpeg2.h
* libavcodec/dxva_vc1.h
