Log Message:
ffmpeg4: updated to 4.1.3

version 4.1.3:
- avcodec/rscc: Check that the to be uncompressed input is large enough
- avformat/movenc: free eac3 private data only when closing the stream
- avcodec/hevcdec: Avoid only partly skiping duplicate first slices
- lavc/bmp: Avoid a heap buffer overwrite for 1bpp input.
- avcodec/mpegpicture: Check size of edge_emu_buffer
- avformat/mov: Fix potential integer overflow in entry check in mov_read_trun()
- avcodec/truemotion2: Fix integer overflow in tm2_null_res_block()
- avcodec/cbs_av1: fix range of values for Mastering Display Color Volume \ 
Metadata OBUs
- avcodec/av1_parser: don't abort parsing the first frame if extradata parsing fails