Analysis: Zhao Hang
Now the rapid development of Internet technology and new things keep emerging, such as we had to listen to music only slowly download the MP3, the same turtle crawling pace of your patience, but a test. Well now, the network speed is faster, more network providers to support online streaming format media player agreement, enjoy online music sites and video on demand sites springing up, we do not have to wait until the entire file and then play all the downloaded it, but while downloading files, listen to one side only need to download before playing some of the contents of the file, the contents stored in the buffer, so there is some delay in the beginning, some of the remaining files will appreciate the program in your When the background from the server to download and save a lot of download time, and today we give tell you about the most common audio format for streaming media and related technology.
First, the definition of streaming media transmission
Streaming refers to the network using streaming technology, continuous time-base media, through the network transmission of audio, video or multimedia files. The so-called streaming technology, is now mainly refers to the network transmission media (such as video, audio) technology general, their specific meaning through a network of video and audio transmission to the PC. Achieve streaming are two methods: real-time streaming mode (Realtime streaming) and order of streaming mode (Progressive streaming).
Second, a common format for streaming audio
Now the network is a common audio format for streaming media are mainly the United States Realnetworks Inc. *. RA *. WMA formats and Microsoft's format, in addition to more than one professional in the field for the U.S. Apple *. MOV format, in three format, MOV format is the best sound quality, especially in MIDI, the support of GS and GM two tone playback to be significantly stronger than that of Windows Media Player, below we give details of the characteristics of these types of formats.
1, RealAudio format
RealNetworks Inc. is a U.S. veteran-class products, is currently the most popular online streaming media technology. Many Internet, music, video on demand sites are using it. RealMedia includes RealAudio (audio files), RealVideo (video files) and RealFlash (vector animation) these three files.
2, QuickTime format
As QuickTime and RealMedia, finished joint compatible with Mac and PC. Speeds and file sizes in the same circumstances, it is the best video quality. It is composed of three different parts: QuickTime Movie (movie) file format, QuickTime Media Abstraction Layer, QuickTime built-in media services system.
3, Windows Media Audio format
WMA (Windows Media Audio) is Microsoft's heavyweight players from its predecessor, Microsoft's Netshow, back strong, but also a large number of the most familiar to Windows users, its core technology is the ASF (Advanced Streaming Format, Advanced Stream format). ASF format support any compression / decompression coding, and can use any of the underlying network transmission protocol, with great flexibility, Bijiao compression standards like MPEG to increase the function of control command script, it is to reduce data traffic However, to maintain quality of the documents used to realize streaming multimedia content distribution.
4, Flash format
Flash is popular on the network although the vector animation, but it sounds like can contain information, also supports streaming, high-quality Flash SWF format is more superior sound and file size smaller, but now they have to use this technology to do music site, you need to enjoy the time to install a Flash plugin to present speed of the network, the few hundred KB of Flash plug-in can be a little too much installed, then you can enjoy the music of the SWF format .
Third, streaming media transport protocol
In the browser, we often address is http:// and ftp:// beginning. Web servers can handle streaming media files http protocol, but the design of Web server itself can not efficiently transmit streaming media files. Streaming media packets must occupy an uninterrupted stream, and will long remain with the server connection status, if there are too many visitors at the same time on-line viewing, performance will be significantly reduced. To solve this problem, streaming media file has its own set of protocols.
1. Live streaming protocol (Real Time Streaming Protocol, RTSP), which is to help build a RealNetworks company used to send streaming media, open web standards. Although it must use a special server known as RealServer, however RTSP video streaming media to enhance the quality, improve transmission efficiency and provide better high-volume processing. If your ISP (Internet information service providers) have a RealServer services, it is recommended that you use RealServer instead of using the Web server to send streaming media files.
2.MMS (Media Server Protocol, MMS), which is a Microsoft-defined protocol for streaming media.
3. Real-time Transport Protocol (Theater Server Protocol, RTP), which is the Internet, a multimedia data stream protocol. RTP is defined as the transmission in-one or one to many work situations, the purpose is to provide time information and achieve synchronous flow, simple language that is on the network Web server,
4. Resource Reservation Protocol (Resource Reserve Protocol, RSVP), as audio and video data streams than traditional data networks are more sensitive to delay, to the network transmission of high-quality audio, video information, in addition to bandwidth requirements but also need many more conditions. RSVP is being developed by Internet on the Resource Reservation Protocol, RSVP set aside to use as part of the network resources (ie bandwidth).
These agreements replace the http and ftp, but like mms: / / 61.139.25. 41/quake such as beginning with MMS or RTSP.
Fourth, a variety of formats player
All three formats each have their own players, they are RealPlayer, QuickTime Player and Windows Media Player.
1.RealPlayer
Real format of high compression ratio and good compression and transmission capacity, especially suitable for network broadcast, or online broadcast mode, the video streaming media format, RM format is the worst quality, but the file is the smallest, low-speed network users ( non-ADSL and broadband users) can also enjoy online videos. Player of the installation process there is a network wizard, allowing users to the actual situation in the network choose their routes. RealPlayer player is also very easy to use, the system of resource consumption in the other two, is the best choice for low-profile users. With ReaNetworks's outstanding technology, it has occupied more than half of online streaming video and audio on-demand market.
2.QuickTime Player
QuickTime Player can be provided through the Internet real-time digital information flow, workflow and document playback. High quality QuickTime file, file tall disadvantage is relatively large, of course, high-definition, high-quality images often means larger files, more transmission time. For this reason, the network can only use QuickTime to do some multi-media advertising, product demonstrations, high-definition video, that require the performance of high-definition video programming on the screen. Network speed is not fluent in the local watch up some difficult, but the system resources QuickTime Player high for your machine configuration is better to be competent, the best is to have fast CPU and more memory, high-performance computers.
Note, QuickTime Player player is not free, and we can go to Apple's home page to download trial version, download address: www.apple.com / QuickTime / download. Tens of dollars and need to register before you can use.
3.Windows Media Player
WMA players to use Windows built-in Windows Media Player on it, WMA music format, a major feature does not require extra player, you are in the "Start / Programs / Accessories / Entertainment" in the figure can find it. Its production, publishing and playback software also integrates with Windows NT/2000/9X. Windows Media Player is the addition of stronger copyright protection, to limit play time, play a certain number of restrictions and even the operating system, etc. This was preventing the terrible fix the audio and video piracy, but a great boon for publishers. Windows Media Player files bigger than the RealMedia file, state line than the QuickTime player can get faster, smoother results.
5, the production of streaming audio files
Now commonly used in audio editing software to support the sound file formats into streaming media format, such as we often use the audio production tools Cooledit Pro and Sound Forge's "Save as" (Save selected items) can be found in streaming media format figure, as in Cooledit Pro's "Save" option.
As long as we work area in Cooledit Pro Select all of the sound file, in the "File" menu, select "Save As" option, the option a lot of sound files for various rate conditions, very easy, just select the appropriate The rate can be the WAV, MP3 sound files so common streaming media formats into a sound file.
Unfortunately Cooledit Pro only supports the G2 RealNetworks and Realmedia, do not support Microsoft's WMA format and require plug-ins to convert WMA. Now the network's WMA format music files have been more and more, more and more popular, and so very convenient, how should we do?
We take a look at another powerful audio editing and processing software from Macromedia Inc. in the United States Sound Forge, I believe we have a hell knew the name of it. Similarly, we have Sound Forge's "Save As" choose items where the RA can be seen Realmedia format, more than a WMA Cooledit Pro option.
We see in Samplitude's diverse output options can be called in to support more audio formats, we can easily bring the original sound file into a streaming media format needs. Need to remind you, Samplitude system resources occupancy rate is relatively high, low-profile friends, please use caution.
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