Trying out Emby on my Mac (OS X Lion 10.7.5, 3.06 GHz Intel Core 2 Duo) so see if better than on my ubuntu server with a slower CPU than this.
Look around 8:33am today on the log file.
Using web browser on the same mac. I have also tried a couple days ago on my iOS device as well as android tv with the same errors in the log.
I can playback the same files through VLC fine.
I had installed ffmpeg separately as I thought that may have been the issue looking through similar issues on this forum.
Same errors on the log on playback before and after the ffmpeg install.