There are two different video file formats known as Flash Video: FLV and F4V. The audio and video data within FLV files are encoded in the same manner as they are within SWF files. The F4V file format is based on the ISO base media file formatand is starting with Flash Player 9 update 3.
Is a media format designed for creating good quality video with resolution of 352x240 on 1.5 Mb/s flow. Now the standard MPEG-1, which belongs to the format supports a resolution of 4K. Resolution mpg is different from the rest of the MPG format family due to its maximum compatibility: files can be run on any PC or DVD-player.