Cantor (jrottenberg#244) https://git.ffmpeg.org/gitweb/ffmpeg.git/shortlog/n3.4.8

Cantor (jrottenberg#244) https://git.ffmpeg.org/gitweb/ffmpeg.git/shortlog/n3.4.8

Hypatia (jrottenberg#243) https://git.ffmpeg.org/gitweb/ffmpeg.git/shortlog/n3.2.15

See !232 

4.1.1 https://www.ffmpeg.org/download.html#release_4.1

Merge branch 'master' of github.com:jrottenberg/ffmpeg 

after ./update.py 

after ./update.py 

after ./update.py 

after ./update.py