The Sony XBR-55X900 has a greater number of video formats than most TVs that came out around the same time as it. The most commonly supported video format is MVC, but this video format is not supported by this TV. The video formats 3GPP, AVCHD, AVI, MKV, MOV, MP4, MPEG1, MPEG2, WEBM, WMV and XVID are also supported by this television.
MP4 stands for Moving Pictures Expert Group 4.
WMV stands for Windows Media Video.
AVI stands for Audio Video Interleave.