Jens Loeffler created a very nice tutorial available at Adobe Developer Center.

At the article is demonstrate how to create a video sharing application as follows:

- In Adobe Flex, display video thumbnails of videos
- In Flex, select a video file from the user’s local hard drive
- In Flex and PHP, upload the file to the web server
- In PHP and with Carbon Coder, transcode the video
- In PHP and Flex, wait until the file is encoded
- In Flex and with Adobe Flash Media Server, update the video thumbnail list
- In Flex and with Flash Media Server, enable the user to click on a thumbnail and play it in the video player