Merge commit '3193b13a'

* commit '3193b13a':
  hlsenc: Allocate enough space for the pattern string
  lavc: Correct the description of pkt_dts
  avfilter: Compile FIFO filters unconditionally

Conflicts:
	libavcodec/avcodec.h
	libavfilter/Makefile
	libavfilter/allfilters.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>