Merge remote-tracking branch 'qatar/master'

* qatar/master:
  flicvideo: fix invalid reads
  vorbis: Avoid some out-of-bounds reads
  vqf: add more known extensions
  cabac: remove unused function renorm_cabac_decoder
  h264: Only use symbols from the SVQ3 decoder under proper conditionals.
  add bytestream2_tell() and bytestream2_seek() functions
  parsers: initialize MpegEncContext.slice_context_count to 1
  spdifenc: use special alignment for DTS-HD length_code

Conflicts:
	libavcodec/flicvideo.c
	libavcodec/h264.c
	libavcodec/mpeg4video_parser.c
	libavcodec/vorbis.c

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

libavcodec/mpeg4video_parser.c

@@ -102,6 +102,7 @@ static av_cold int mpeg4video_parse_init(AVCodecParserContext *s)
         return -1;
     pc->first_picture = 1;
     pc->enc->quant_precision=5;
+    pc->enc->slice_context_count = 1;
     return 0;
 }