Log Message:
Changes 2.1.4:
* avcodec/hevc: Simplify get_qPy_pred()
* avcodec/mpeg4videodec: Check for bitstream overread in decode_vol_header()
* avcodec/h264: use subsample factors of the used pixel format
* avformat/bink: Check return value of av_add_index_entry()
* avcodec/h264: more completely check the loop filter parameters
* avcodec/alsdec: check predictor order against block length
* avcodec/hevc_ps: Use get_bits_long() in decode_vui()
* avcodec/hevc: make check for previous slice segment tighter
* avcodec/hevc: clear tab_slice_address of ctb on error.
* avcodec/hevc: hls_decode_entry: check that the previous slice segment is \ 
available before decoding the next
* avcodec/hevc: clear tab_slice_address in hevc_frame_start()
* avcodec/h264: update current_sps & sps->new only after the whole slice \ 
header decoder and init code finished
* avcodec/h264: Disallow pps_id changing between slices
* avcodec/aacdec: Fix pulse position checks in decode_pulses()
* avcodec/hevc: propagate error code from hls_coding_quadtree()
* avcodec/tiff: reset geotag_count in free_geotags()
* avcodec/vc1: Check bfraction_lut_index
* avcodec/vc1: factor read_bfraction() out
* avcodec/vc1dec: field pictures with direct mode MBs, followed by frame \ 
pictures are not supported