The number of video formats supported by the TX-40DS503 is more than most mid-size TVs that are a comparable age to it. This Panasonic television supports an AVI video format, which is the most frequently supported video format supported by comparable spec televisions that have been available for around the same time as the TX-40DS503. The video formats "3GPP", "FLV", "M4V", "MKV", "MP4", "PS", "TS", "VOB", "VRO" and "WMV" are also supported by this TV.
MP4 stands for Moving Pictures Expert Group 4.
WMV stands for Windows Media Video.
AVI stands for Audio Video Interleave.