ffmpeg was updated to 2.8.8 to fix the following issues, both bugs and security issues:

* avformat/oggparsevp8: fix pts calculation on pages ending with an invisible frame
* avcodec/mjpegdec: Do not try to detect last scan but apply idct after all scans for progressive jpeg
* avformat/oggparseopus: Check that granule pos is within the supported range
* avformat/utils: Check bps before using it in a shift in ff_get_pcm_codec_id()
* ffmpeg: Check that r_frame_rate is set before attempting to use it
* avformat/utils: Do not compute the bitrate from duration == 0
* avformat/utils: Check negative bps before shifting in ff_get_pcm_codec_id()
* avformat/avidec: Detect index with too short entries
* avformat/oggparseopus: Fix Undefined behavior in oggparseopus.c and libavformat/utils.c
* avformat/allformats: Making av_register_all() thread-safe.
* avcodec/vp9_parser: Check the input frame sizes for being consistent
* avformat/oggdec: Fix integer overflow with invalid pts
* avcodec/ffv1enc: Fix assertion failure with non zero bits per sample
* avcodec/diracdec: Check numx/y
* avformat/avidec: Fix infinite loop in avi_read_nikon()