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Windows¶àýÌå¸ñʽ


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Windows media files have the extensions: .asf, .asx, .wma, and .wmv.
WindowsýÌåÎļþ¸ñʽËù°üº¬µÄÀ©Õ¹ÃûÈ磺.asf¡¢ .asx¡¢ .wmaºÍ .wmv¡£


The ASF Format
ASF¸ñʽ

The ASF format (Advanced Streaming Format) is specially designed to run over the Internet.
ASF¸ñʽ£¨¸ß¼¶Á÷ýÌå¸ñʽ£©ÊÇÉè¼ÆÓÃÀ´ÔÚ»¥Á¬ÍøÖв¥·ÅµÄ¸ñʽ¡£

ASF files can contain audio, video, slide shows, and synchronized events.
ASFÎļþ¿ÉÒÔ°üº¬ÒôƵ¡¢ÊÓÆµ¡¢»ÃµÆÆ¬ºÍͬ²½Ê¼þ¡£

ASF files can be highly compressed and can be delivered as a continuous flow of data (on-line TV or radio). Files can be of any size, and can be compressed to match many different bandwidths (connection speeds).
ASFÎļþ¿ÉÒÔ±»¸ß¶ÈµÄѹËõ£¬²¢ÇÒ¿ÉÒÔ×÷Ϊһ¸öÁ¬ÐøµÄÊý¾ÝÁ÷£¨ÔÚÏßµçÊÓ»òÔÚÏ߹㲥£©À´´«µÝ¡£Îļþ¿ÉÒÔÊÇÈκγߴ磬²¢ÇÒ¿ÉÒÔͨ¹ýѹËõÀ´ÊÊÓ¦²»Í¬µÄ²¨¶Î£¨Á´½ÓËÙ¶È£©¡£


The ASX Format
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ASX (Advanced Stream Redirector) files are not media files, but metafiles.
ASX£¨¸ß¼¶Êý¾ÝÁ÷תÏòÆ÷£©Îļþ²¢²»ÊǶàýÌåÎļþ£¬µ«ËüÊÇÒ»¸öÔªÎļþ¡£

Metafiles provides information about files. ASX files are plain text files used to describe multimedia content:
ÔªÎļþÌṩÁ˹ØÓÚÎļþµÄÐÅÏ¢¡£ASXÎļþÊÇÒ»¸öÓÃÓÚÃèÊö¶àýÌåÄÚÈݵļòµ¥Îı¾Îļþ¡£

<ASX VERSION="3.0">
<Title>Holiday 2001</Title>
<Entry>
<ref href="holiday-1.avi"/>
</Entry>
<Entry>
<ref href="holiday-2.avi"/>
</Entry>
<Entry>
<ref href="holiday-2.avi"/>
</Entry>
</ASX>

The file above describes three multimedia files. When the ASX file is read by a player, the player can play the files described.
ÉÏÊöÎļþÃèÊöÁËÈýÖÖ¶àýÌåÎļþ¡£µ±ASXÎļþ±»²¥·ÅÆ÷¶Áȡʱ£¬²¥·ÅÆ÷¿ÉÒÔÓÃÓÚ²¥·ÅÃèÊöµÄÎļþ¡£


The WMA Format
WMA¸ñʽ

The WMA (Windows Media Audio) format is an audio format developed by Microsoft.
WMA£¨WindowsýÌåÒôƵ£©¸ñʽÊÇÓÉ΢Èí¿ª·¢µÄÒôƵ¸ñʽ¡£

WMA is designed to handle all types of audio content. The files can be highly compressed and can be delivered as a continuous flow of data (on-line radio). WMA files can be of any size, and be compressed to match many different bandwidths (connection speeds).
WMAÖ¼ÔÚ´¦ÀíËùÓÐÀàÐ͵ÄÒôƵÄÚÈÝ¡£Îļþ¿ÉÒÔ±»¸ß¶ÈѹËõ£¬²¢¿ÉÒÔ×÷ΪÁ¬ÐøµÄÊý¾ÝÁ÷£¨ÔÚÏ߹㲥£©½øÐд«Êä¡£WMAÎļþ¿ÉÒÔÊÇÈκγߴ磬²¢ÇÒ¿ÉÒÔ±»Ñ¹Ëõ³ÉÊÊÓ¦¸÷ÖÖ²»Í¬²¨¶Î£¨²»Í¬Á¬½ÓËÙ¶È£©µÄ¸ñʽ¡£

The WMA format is similar to the ASF format (see above)
WMA¸ñʽÓëASF¸ñʽ¼«ÎªÏàËÆ£¨¼ûÉÏÃæµÄÃèÊö£©¡£


The WMV Format
WMV¸ñʽ

The WMV (Windows Media Video) format is a video format developed by Microsoft.
WMV£¨Windows¶àýÌåÊÓÆµ£©¸ñʽÊÇÓÉ΢Èí¿ª·¢µÄÊÓÆµ¸ñʽ¡£

WMV is designed to handle all types of video content. The files can be highly compressed and can be delivered as a continuous flow of data (on-line radio). WMV files can be of any size, and be compressed to match many different bandwidths (connection speeds).
WMVÖ¼ÔÚ´¦ÀíËùÓÐÀàÐ͵ÄÊÓÆµÄÚÈÝ¡£Îļþ¿ÉÒÔ±»¸ß¶ÈѹËõ£¬²¢¿ÉÒÔ×÷ΪÁ¬ÐøµÄÊý¾ÝÁ÷£¨ÔÚÏ߹㲥£©½øÐд«Êä¡£WMVÎļþ¿ÉÒÔÊÇÈκγߴ磬²¢ÇÒ¿ÉÒÔ±»Ñ¹Ëõ³ÉÊÊÓ¦¸÷ÖÖ²»Í¬²¨¶Î£¨²»Í¬Á¬½ÓËÙ¶È£©µÄ¸ñʽ¡£

The WMV format is similar to the ASF format (see above)
WMV¸ñʽÓëASF¸ñʽ¼«ÎªÏàËÆ£¨¼ûÉÏÃæµÄÃèÊö£©¡£


Other Windows Media Formats
ÆäËûWindows¶àýÌå¸ñʽ

WAX (Windows Media Audio Redirector) files are much the same as ASX files, but intended to describe audio files (.wma files)
WAX£¨Windows ¶àýÌåÒôƵתÏòÆ÷£©ÓëASXÎļþ·Ç³£ÏàËÆ£¬µ«ÊÇ£¬ËüÖ¼ÔÚÃèÊöÒôƵÎļþ£¨.wma Îļþ£©

WMP (Windows Media Player) files and WMX are reserved file types for future use by Windows.
WMP£¨Windows ¶àýÌå²¥·ÅÆ÷£©ÎļþºÍWMX±»Î¢ÈíËù±£Áô£¬×÷Ϊ½«À´ËùʹÓõÄÎļþÀàÐÍ¡£

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