LG 84LM9600 User Manual page 90

Caution for playing video
❐
✎ Some subtitles created by users may not work properly.
✎ The video and subtitle files should be placed in the same folder. In this case,
you must assign the same names for the video and subtitle files for proper
display.
✎ We do not support any stream that contains GMC (Global Motion
Compensation) or Qpel (Quarterpel Motion Estimation).
✎ Only H.264/AVC profile level 4.1 and lower is supported.
✎ The file size limit is dependent on the encoding environment.