From Cool Soft:
H264LevelEditor is a free tool to edit an H264/AVC encoded video stream. Works both on MKV containers and raw H264 streams (*.h264, *.264, *.ts or any other file containing H264 encoded video). Video stream or file is edited in-place, which means: fast editing, no need to reencode the file (save time), and no need to demux, edit and remux streams (save time and HDD space). To make a long story short, some mediaplayers (like my Samsung C6000 LED TV and Sony PS3) search the video file being played for an header info named AVC profile level, if this level is greater than the requested (supported) one they simply refuse to play it, even if they could.