Log Message:
ffmpeg4,ffplay4: updated to 4.3.1

version 4.3.1:
 avcodec/tiff: Check input space in dng_decode_jpeg()
 avcodec/mjpeg_parser: Adjust size rejection threshold
 avcodec/cbs_jpeg: Fix uninitialized end index in cbs_jpeg_split_fragment()
 avformat/sdp: Fix potential write beyond end of buffer
 avformat/mm: Check for existence of audio stream
 avformat/mov: Fix unaligned read of uint32_t and endian-dependance in \ 
mov_read_default
 avcodec/apedec: Fix undefined integer overflow with 24bit
 avcodec/loco: Fix integer overflow with large values from loco_get_rice()
 avformat/smjpegdec: Check the existence of referred streams
 avcodec/tiff: Check frame parameters before blit for DNG
 avcodec/mjpegdec: Limit bayer to single plane outputting format
 avcodec/pnmdec: Fix misaligned reads
 avcodec/mv30: Fix integer overflows in idct2_1d()
 avcodec/hcadec: Check total_band_count against imdct_in size
 avcodec/scpr3: Fix out of array access with dectab
 avcodec/tiff: Do not overrun the array ends in dng_blit()
 avcodec/dstdec: Replace AC overread check by sample rate check
 dnn_backend_native: Add overflow check for length calculation.
 avcodec/h264_metadata_bsf: Fix invalid av_freep
 avcodec/cbs_h265: set default VUI parameters when vui_parameters_present_flag \ 
is false
 avcodec/av1_parser: initialize avctx->pix_fmt
 avcodec/av1_parser: add missing parsing for RGB pixel format signaling
 avcodec/av1_parser: set context values outside the OBU parsing loop
 avutil/avsscanf: Add () to avoid integer overflow in scanexp()
 avformat/utils: reorder duration computation to avoid overflow
 avcodec/pngdec: Check for fctl after idat
 avformat/hls: Pass a copy of the URL for probing
 avutil/common: Fix integer overflow in av_ceil_log2_c()
 avcodec/wmalosslessdec: fix overflow with pred in revert_cdlms
 avformat/mvdec: Fix integer overflow with billions of channels
 avformat/microdvddec: skip malformed lines without frame number.
 dnn_backend_native: check operand index
 dnn_backend_native.c: refine code for fail case
 avformat/mov: fix memleaks
 libavformat/mov: Fix memleaks when demuxing DV audio
 avcodec/cbs_av1: Fix writing uvlc numbers >= INT_MAX
 avformat/avc, mxfenc: Avoid allocation of H264 SPS structure, fix memleak
 avcodec/bitstream: Don't check for undefined behaviour after it happened
 avformat/aviobuf: Also return truncated buffer in avio_get_dyn_buf()
 avformat/aviobuf: Don't check for overflow after it happened