FLV file format

.flv

FFDShow

This flash video format is defined by the Adobe systems and is commonly used for online videos. There are multiple users of the flash video format such as YouTube, Hulu, VEVO, Yahoo! and other services that you serf online on your iPhone, iPad, or laptop. One can access the flash video on various operating systems by enabling the Adobe Flash Player and web browser plugin or other third-party programs except for iOS.

FLV files use the H.263 standard under the Sorenson Spark (FourCCFLV1) codec, and there are various reasons for it, such as;

• These are the first codec files that are supported by Flash Player.
• The heavy usage throughout other versions being able to support this same codec.

The audio can be recorded over the video using a microphone and Nellymoser Asao codec. By using the bitmap tile and lossy compression while reducing color depth, the screen share is possible. But the primary difference is that the screen share done by the 2nd way is only compatible with Flash Player 8.