No issue with ffmpeg 3.1.1 (July 1st build)
I tried ffmpeg 3.1.1 released July 1st 2016 with several video formats and subtitles and it works flawless with Serviio and my Sony 2010. I am still on Windows XP and therefore, I use a patched ffmpeg. For those who want to experiment with the latest ffmpeg and XP, see https://ffmpeg.zeranoe.com/forum/viewtopic.php?f=13&t=3572.
