The 55PFK5500/12 has a greater number of video formats than most large TVs that were released around the same time as it. This television supports an AVI video formats supported, which is the most commonly supported video formats supported supported by TVs of a similar age and spec to the 55PFK5500/12. The video formats supporteds "AVC", "H.264", "MKV", "MPEG1", "MPEG2", "MPEG4", "VC-1" and "WMV9" are also supported by this TV.
WMV stands for Windows Media Video.
AVI stands for Audio Video Interleave.