Updated mythtv packages fix security issues

This update provides and update to mythtv 30, and updates the bundled ffmpeg to 3.2. It also fixes at least the following issue: The flvwritepacket function in libavformat/flvenc.c in FFmpeg through 4.0.2 does not check for an empty audio packet, leading to an assertion failure CVE-2018-15822. It...

Format string

In FFmpeg 3.2 and 4.1, a denial of service in the subtitle decoder allows attackers to hog the CPU via a crafted video file in Matroska format, because ffhtmlmarkuptoass in libavcodec/htmlsubtitles.c has a complex format argument to sscanf...