#78 ffmpeg 3.3.2 has security problems

[Alexander Stohr]

i got this hint on issues with avidemux:

"version 2.7.0 (based on FFMPEG version 3.3.2) is affected by CVE-2017-11719 and CVE-2017-11399"

out of bounds access might crash application (or might even allow execution of unwanted codes)
first non-vulnerable versions:
for ffmpeg 3.2 series: 3.2.7
for ffmpeg 3.3 series: 3.3.3

see also:
http://avidemux.org/smif/index.php/topic,18290.0.html