Description:

FLV streaming means it can be sought to any position during video, and
browser (Flash player) will buffer only from this position to the end.
Thus streaming allows to skip boring parts or see video ending without
loading the whole file, which simply saves bandwidth. Even H264 is more
efficient, FLV is still a common container format for videos, because
H264 is supported by Flash since version 9.115.

For using FLV streaming on the web, a pseudo-streaming compliant Flash
player, such as Flowplayer, is needed. Streaming requires that the FLV
has embedded key-frame markers (meta-data), that can be injected by any
supported tool, e.g. flvtool2.