The Panasonic TX-40CX680 has a greater number of video formats than most 4K and 8K TVs that were released around the same time as it. This TV supports an AVI video format, which is the most commonly supported video format supported by TVs of this spec and age. The video formats "3GPP", "FLV", "M4V", "MKV", "MP4", "TS", "VOB", "VRO" and "WMV" are also supported by this Panasonic TV.
MP4 stands for Moving Pictures Expert Group 4.
WMV stands for Windows Media Video.
AVI stands for Audio Video Interleave.