Fix: RARFileSource key name was missing from SrcFiltersKeys array.
AudioParser: added GetDTSFrameSize function
update ffmpeg/config.h
update ffmpeg (n0.8-19508-g454c5d1)

Notes: broken atm because our custom files need to be updated too

* libavcodec/h264_dxva.c
* libavcodec/h264_recov.c
* libavcodec/vc1_dxva.c