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connections, the movie plays as it downloads, as if it were streaming. Fast Start delivers all types of QuickTime media, including sprites and QuickTime VR. Lost packets are retransmitted until they are received and there are no problems with firewalls or Network Address Translation. However, Fast Start cannot broadcast, multicast, or transmit live video feeds. Users cannot skip forward through the movie until the entire movie has been downloaded, and a copy of the movie remains on the local hard drive. For true streaming, the QuickTime server supports RTP (Real time Transport Protocol). RTP is similar to HTTP and FTP, but tailored for the special needs of real-time streaming. Unlike HTTP, RTP does not download an entire movie to the client computer. Instead it siphons out a thin, one-way data stream at a constant data rate that plays the broadcast in real time, after a few initial moments of delay for handshaking and data buffering. A streamed one-minute movie plays in exactly one minute (plus buffering delay). As long as the connection has enough bandwidth to handle the data stream, the movie will play. Once data has been displayed by the player, it is discarded. No file on the local hard drive remains after playback. Viewers can see the broadcast again only by requesting it from the streaming server. RTSP (Real Time Streaming Protocol) is a companion protocol to RTP, used when viewers communicate with a unicast server. RTSP allows twoway communication, so that viewers can command the server to do things like rewind the movie, skip to the next chapter, and so on. RTP, in contrast, is a one-way protocol. Once playback starts, it can only continue or be halted. The user cannot skip through the stream or rewind. Viewer interaction with the on-screen movie via the player s motion controls can only be relayed to the server using RTSP requests, which the player forms in response to user interactions. RTP uses low-level UDP (User Datagram Protocol) transport, which is faster and more efficient than the usual TCP/IP (Transport Control Protocol/Internet Protocol) used for most Web traffic. However, UDP lacks a mechanism for reporting lost packets, so that streaming over the Internet almost always involves some data loss. Also, because most corporate and personal firewalls block UDP, viewers behind a firewall may not be able to receive live streams, even though they can request them via RTSP. Apple provides proxy server software to get around firewalls, but the system administrator who maintains the firewall must install the proxy software. RTP also uses port addresses that may confuse some Network Address Translators and prevent users from receiving live streams. A final drastic solution to using RTP with firewalls is HTTP tunneling,
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where RTP packets are wrapped inside ordinary HTTP packets so that they can pass through the firewall. Unfortunately, HTTP tunneling adds significant overhead to the stream, so takes more bandwidth. When a QuickTime Player tunes in to a live broadcast, it sends a request to the streaming server. The server looks for a Session Descriptor Protocol (SDP) file. If this is found, it begins to stream the media to the computer via RTP. An SDP file is a text file containing information about what will be streamed and telling how to tune in. SDP files are created by broadcast software on the computer that captures live media. The SDP file must be copied to the Streaming Server before the media can be broadcast. RTP is the only way to transmit live feeds with QuickTime. Multicast also requires RTP support. Because QuickTime movies consist of many concurrent media tracks, individual tracks can be served from any streaming server simultaneously, using RTP. However, some QuickTime media types, such as QuickTime VR, Flash, and sprites don t stream. The solution is to stream the audio and video parts of the QuickTime movie using RTP and stream wired sprites or chapter lists over HTTP, using Fast Start. The movie author can organize production to enable this workaround. You create a streaming movie for an RTP server by adding hint tracks to an existing movie. The hinting is performed by media packetizer components in QuickTime Pro. QuickTime selects an appropriate media packetizer for each track and routes each packetizer s output through an Apple-provided packet builder to create a hint track. One hint track is created for each streamable track in the movie. Hint tracks tell the RTP server how best to break the media down into packets for optimally smooth transmission to the QuickTime player, preserving video frame integrity where possible. Hint tracks are quite small compared with audio or video tracks. A movie that contains them can be played from a local hard disk or streamed using HTTP Fast Start, but the hinting information is only used when streaming over RTP. In December 2001, Apple began talking about the forthcoming QuickTime 6. The company announced that it would use MPEG-4 as the file format, adding MPEG-4 video compression and AAC (Advanced Audio Coding) to the platform. Apple also reinforced its commitment to make every piece of its architecture and infrastructure move toward open standards, while attempting to bring other developers along with them. The ISO actually selected the QuickTime format as the basis for its MPEG-4 file format, so the move is an easy one for Apple to make. The aim is to create ISO-compliant .MP4 files rather than Apple s proprietary .MOV files, so that they will play back on any ISO-compliant MP4
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