Samsung LE40B651 QNAP Serviio MP4 Problem

Hi there
I have a Samsung LE40B651 TV and have issues with MP4 files using Serviio 1.4.2 Revision 1 on QNAP TS-859U over DLNA.
I really can't tell why but all MP4 files over DLNA give this error "unsupported file format". When i use Serviio 1.4.1.2 on my PC the same files play flawlessly.
I have tried alot of diferent things (changing profiles, enable/disable transcoding) but i guess something is very wrong.
All MP4 files (most of them) are in the right format (video: h264 High@L4.1, video: aac lc).
They even play directly from a USB pen connected to the TV.
Can someone please give some pointers.
Thank you so much.
EDIT: So far MKV/AVI play ok both from QNAP and PC
I have a Samsung LE40B651 TV and have issues with MP4 files using Serviio 1.4.2 Revision 1 on QNAP TS-859U over DLNA.
I really can't tell why but all MP4 files over DLNA give this error "unsupported file format". When i use Serviio 1.4.1.2 on my PC the same files play flawlessly.
I have tried alot of diferent things (changing profiles, enable/disable transcoding) but i guess something is very wrong.
All MP4 files (most of them) are in the right format (video: h264 High@L4.1, video: aac lc).
They even play directly from a USB pen connected to the TV.
Can someone please give some pointers.
Thank you so much.
EDIT: So far MKV/AVI play ok both from QNAP and PC