The Panasonic TX-L55DT50 has a greater number of video formats than most TVs of this spec and age. The most frequently supported video format is VP8, but this video format is not supported by this Panasonic TV. The video formats AVCHD, AVI, DIVX, M-JPEG, MKV, MOV and MP4 are also supported by this television.
AVI stands for Audio Video Interleave.
MP4 stands for Moving Pictures Expert Group 4.