Change Details

Release info available [here](https://ffmpeg.org/download.html#release_3.4) Signed-off-by: Pierre-Yves <pyu@riseup.net>

Release info available [here](https://github.com/FFmpeg/FFmpeg/blob/bc839fb39dc376d462856863de2933f0b6b0351a/Changelog) Signed-off-by: Pierre-Yves <pyu@riseup.net>

Release info available [here](https://ffgithub.com/FFmpeg.org/download.html#release_3.4/FFmpeg/blob/bc839fb39dc376d462856863de2933f0b6b0351a/Changelog) Signed-off-by: Pierre-Yves <pyu@riseup.net>