Ø Traditional HTTP: Early experiments with delivering video via HTTP were less than satisfactory for a number of reasons, not the least of which was the limited bandwidth available in the 28/56Kbps modems of the day. The first video files posted on the web were delivered via download and play, which mean they had to be fully downloaded before playback began.
Ø Progressive Download: Progressive Download is the most widely used video delivery method by far (in part because it's what YouTube uses). It's also easiest to implement: just put a video on your webserver and point your player to the URL. Once a user hits play, the player immediately starts downloading the file. The player will start video playback as soon as it has enough data to do so, but it will continue to download until it has received the whole file (hence the progressive)
In most cases (Flash needs a small server module), it is possible to seek in a player to a not-yet- downloaded part of the video. At that point, the player re-downloads the video, starting at the seek offset instead of at the beginning. We call that feature pseudo-streaming.
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