Similar behaviour with xxx.jpeg photos, but in that case the TV does not react at all.
Notice that the same TV works perfectly with TVMOBiLi if I force the transcoding (but no problem anyway on photos).
I have no problem with most of the videos.
Server is running on Mac OS 10.12.03
The log file is in attachment. I also tried to load the profile which forces transcoding (LG Android... found on this forum), but without any result.