MOV is a MPEG-4 digital video container format used on Apple’s QuickTime Player. It was developed in 1998 by Apple as the proprietary video format for Macintosh. On top of video data, MOV format can also store audio and text data, such as subtitles. It can open easily on both Macs and PCs, although Windows require 3vix codec.
Apple QuickTime Player Power DVD ROXIO Creator VLC Media Player
FLV (Flash Video) is a video container format developed by Adobe Systems and comes with a .flv filename format. FLV is primarily used to stream audio, video, and text data such as subtitles on sites like YouTube, Metacafe, and more. It supports MPEG-4 Part 10 (H.264) video codec and AAC sound.
RealPlayer, Apple QuicTime Player MPLayer VLC Media Player