General Information About Streaming Media
What are RTSP, PNM/PNA and MMS?
RTSP (Real Time Streaming Protocol) is an Open Standard protocol for streaming media, used by the majority of streaming vendors, including Apple. MMS is Microsoft’s own solution, but Microsoft will replace MMS with RTSP in future releases. PNA and PNM are RealNetworks’ legacy streaming protocols and are not used anymore. It is important for network administrators not to block RTSP protocols and connections in their firewalls.Downloading vs Streaming Content
Multimedia content downloaded from the Internet, or received by email can indeed contain a virus, therefore you should install Anti-Virus software on your mail servers and firewalls. Streaming Media on the other hand, is the opposite of downloading: content is streamed directly to the Player, and is not placed on your harddrive. There are no known viruses that can distribute nor activate themselves using Streaming Media content, servers or players. There are some minor and major known vulnerabilities in Windows Media Player, please use Windows Update to patch these, and please read the EULA for all players carefully.
What is the difference between downloading and streaming?
A Streaming Server only sends streaming data right to the streaming client. No data is saved to the harddisk in this process. The rtsp and mms protocols uses UDP which has no error correction. (The player and server use better error correction technology which prevents data loss as far as possible but don’t require a large amount of overhead). The stream is buffered at the client side so possible dips can be overcome. This is just an example of the smart technology used in streaming software. Since server and player software are optimized for realtime content distribution, the overall experience using streaming is *far superior* opposed to downloading. Note: streaming servers can tunnel mms/rtsp streams through HTTP, so content still can’t easily be downloaded, but will still get through firewalls. Some other servers (Icecast) fake a stream and do send a regular file over HTTP (progressive download).
What are Multirate Files? Windows Media Technology
QuickTime uses another similar solution but with another technology. You encode multiple streaming files in several bitrates and sizes. You also produce a reference movie. This reference movie looks at the technical details of the system configuration of the end-user (like system power, network connection, software version, etc) and selects the appropriate streaming file. This technology gives you the most control over the content but also has a downside, because a player can’t automatically switch between bitrates during playback.
Content from streaming servers can’t be downloaded
Inexpensive Hosting Company