词条 | M3U | |||||||||
释义 |
| name = M3U |_noextcode = true | extensions = .m3u , .m3u8 |_nomimecode = on | mime = various; see § Internet media types | type code = | released = | genre = Playlist | extended_to = HTTP Live Streaming playlist }} M3U (MP3 URL[1][2] or Moving Picture Experts Group Audio Layer 3 Uniform Resource Locator[1] in full) is a computer file format for a multimedia playlist. One common use of the M3U file format is creating a single-entry playlist file pointing to a stream on the Internet. The created file provides easy access to that stream and is often used in downloads from a website, for emailing, and for listening to Internet radio. Although originally designed for audio files, such as MP3, it is commonly used to point media players to audio and video sources, including online sources. M3U was originally developed by Fraunhofer for use with their Winplay3 software,[2] but numerous media players and software applications now support the format. M3U playlists have been the cause of vulnerabilities in many music players such as VLC media player[3], iTunes[4], Winamp[5] and many others.[6] File formatThere is no formal specification for the M3U format; it is a de facto standard. An M3U file is a plain text file that specifies the locations of one or more media files. The file is saved with the "m3u" filename extension if the text is encoded in the local system's default non-Unicode encoding (e.g., a Windows codepage), or with the "m3u8" extension if the text is UTF-8 encoded.[7] Each entry carries one specification. The specification can be any one of the following:
Extended M3UThe M3U file can also include comments, prefaced by the "#" character. In extended M3U, "#" also introduces extended M3U directives. The following are M3U extensions:
M3U8The Unicode version of M3U is M3U8, which uses UTF-8-encoded characters. M3U8 files are the basis for the HTTP Live Streaming (HLS) format originally developed by Apple to stream video and radio to iOS devices, and which is now a popular format for Dynamic Adaptive Streaming over HTTP (DASH) in general. The current proposal for the HLS playlist format uses UTF-8 exclusively and does not distinguish between the "m3u" and "m3u8" file name extensions.[8] Internet media typesThe only Internet media type registered for M3U and M3U8 is The current proposal for the HLS playlist format acknowledges two media types which it treats as equivalent: For non-HLS applications, no media types were standardized or registered with the IANA, but a number of media types are nonetheless associated with the historical and ongoing use of the M3U and M3U8 formats for general playlists:
These types, plus Examples{{Example farm|section|date=August 2016}}
This is an example of an extended M3U file on the Windows platform. Sample.mp3 and Example.ogg are the media files. 123 and 321 are the lengths in seconds.[16] A length of -1 or 0 may be used when the media file is a streaming file, as there is no actual, predefined length value. The value after the length is the title to be shown, which is generally the same as the location of the file which is on the second line. On the Mac OS X and Linux platforms, Unix paths are used. #EXTM3U #EXTINF:123, Sample artist - Sample title C:\\Documents and Settings\\I\\My Music\\Sample.mp3 #EXTINF:321,Example Artist - Example title C:\\Documents and Settings\\I\\My Music\\Greatest Hits\\Example.ogg
This example shows how to create an m3u file linking to a specified directory (for example, a flash drive, or CD-ROM). The m3u file should contain only one string: the path to the directory. After starting, the media player will play all contents of the directory:
Here is another example, using relative format. The M3U file is placed in the same directory as the music, and directories must be preserved when moving the playlist to another device if subdirectories are used. This method is more flexible, as it does not rely on the file path staying the same. This is the same file as above, saved as sample.m3u in C:\\Documents and Settings\\User\\My Music\\ #EXTM3U #EXTINF:123, Sample artist - Sample title Sample.mp3 #EXTINF:321,Example Artist - Example title Greatest Hits\\Example.ogg This format in an M3U allows copying to another device for playback. All files and directories referred to must also be copied.
Here is a mixed example: Alternative\\Band - Song.mp3 Classical\\Other Band - New Song.mp3 Stuff.mp3 D:\\More Music\\Foo.mp3 ..\\Other Music\\Bar.mp3 http://emp.cx:8000/Listen.pls http://www.example.com/~user/Mine.mp3 Notes:
References to other M3U playlists, for example, are generally not well-supported.
The following is an example of a M3U playlist file for "Jar of Flies" album by "Alice in Chains" that was created by Mp3tag with the following custom option settings:[17][18][19]
#EXTM3U #EXTINF:419,Alice in Chains - Rotten Apple Alice in Chains_Jar of Flies_01_Rotten Apple.mp3 #EXTINF:260,Alice in Chains - Nutshell Alice in Chains_Jar of Flies_02_Nutshell.mp3 #EXTINF:255,Alice in Chains - I Stay Away Alice in Chains_Jar of Flies_03_I Stay Away.mp3 #EXTINF:256,Alice in Chains - No Excuses Alice in Chains_Jar of Flies_04_No Excuses.mp3 #EXTINF:157,Alice in Chains - Whale And Wasp Alice in Chains_Jar of Flies_05_Whale And Wasp.mp3 #EXTINF:263,Alice in Chains - Don't Follow Alice in Chains_Jar of Flies_06_Don't Follow.mp3 #EXTINF:245,Alice in Chains - Swing On This Alice in Chains_Jar of Flies_07_Swing On This.mp3 SoftwareTag editors{{category see also|Tag editors}}The following tag editor software allows users to edit the ID3 tags in MP3 files, and has support for creating M3U files.
Media players{{category see also|Media players}}
See also
References1. ^{{cite web |url=http://ftp6.nero.com/user_guides/mediahome/NeroMediaHome_Eng.pdf |title=Nero MediaHome 4 - Manual |author=Nero |archive-url=https://web.archive.org/web/20150905193735/http://ftp6.nero.com/user_guides/mediahome/NeroMediaHome_Eng.pdf |archive-date=2015-09-05 |dead-url=no}} 2. ^[https://web.archive.org/web/20020606035458/http://www.winamp.com/download/docs/index.jhtml?filenumber=120&language=english&layout=normal&prevlayout=normal The Playlist and Playlist Editor – Nullsoft Winamp Online Documentation] 3. ^{{cite web |url=https://www.videolan.org/security/ |year=2008 |title=VideoLAN-SA-0804 (CVE-2007-6683) |quote=Arbitrary file overwrite and other abuses through M3U parser and browsers plugins.}} 4. ^{{cite web |url=http://cve.circl.lu/cve/CVE-2012-0677 |title=Heap-based buffer overflow in Apple iTunes before 10.6.3 allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via a crafted .m3u playlist.}} 5. ^{{cite web |url=https://www.cvedetails.com/cve/CVE-2000-0624/ |title=Buffer overflow in Winamp 2.64 and earlier allows remote attackers to execute arbitrary commands via a long #EXTINF: extension in the M3U playlist.}} 6. ^{{cite web |url=https://packetstormsecurity.com/search/?q=m3u&s=files |title=247 search results |work=Packet Storm |access-date=2018-01-23}} 7. ^{{cite web |url=https://www.nero.com/enu/wGlobal/content/elements/sysreq/n2015pla-sysreq.php?viewmode=nElement&vlang=us |title=Nero 2015 Platinum - System Requirements |quote=MP3 URL + UTF-8 (M3U8)}} 8. ^1 https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4 9. ^https://www.iana.org/assignments/media-types/media-types.xhtml#audio 10. ^https://www.iana.org/assignments/media-types/application/vnd.apple.mpegurl 11. ^1 {{cite web |url=http://www.iis.fhg.de/audio |archive-url=https://web.archive.org/web/19970606171426/http://www.iis.fhg.de:80/departs/amm/layer3/winplay3/ |dead-url=yes |archive-date=1997-06-06 |title=WinPlay3 - Windows real-time ISO/MPEG Audio Layer 3 Player |date=1996-10-30 |author=Fraunhofer Gesellschaft, Fraunhofer Institut für Integrierte Schaltungen-A}} 12. ^1 {{cite web |url=https://lockergnome.com/mp3/article14.html |first=Matt |last=Gruett |title=M3U FILES AND STREAMING |archive-url=https://web.archive.org/web/20010426110118/https://lockergnome.com/mp3/article14.html |archive-date=2001-04-26 |dead-url=yes |work=LockerGnome}} 13. ^1 https://blogs.msdn.microsoft.com/ie/2015/01/29/simplified-adaptive-video-streaming-announcing-support-for-hls-and-dash-in-windows-10/ 14. ^https://msdn.microsoft.com/en-us/library/ff975073(v=vs.85).aspx 15. ^http://developer.lge.com/webOSTV/api/supported-standard-web-api/html5-standard/audio-video/ 16. ^{{cite web|url=http://www.clearone.com/uploads/resource/030055_Creating_Playlists_to_Work_with_the_Streaming_Music_Manager-0.pdf|title=DigiLinX Application Note - Creating Playlists to Work with the Streaming Music Manager|last=|first=|date=2007-10-05|website=|access-date=}} 17. ^MP3tag Export Settings. 18. ^MP3tag Playlist Settings. 19. ^MP3tag Scripting Functions. 20. ^Astro Player official web-site {{webarchive|url=https://web.archive.org/web/20091201025112/http://www.astroplayer.com/ |date=2009-12-01 }} 21. ^[https://play.google.com/store/apps/details?id=com.astroplayerbeta Astro Player (old) - Sidenis LLC ] {{webarchive|url=https://web.archive.org/web/20160303172333/https://play.google.com/store/apps/details?id=com.astroplayerbeta |date=2016-03-03 }} 22. ^[https://play.google.com/store/apps/details?id=com.astroplayer Astro Player - Sidenis LLC ] {{webarchive|url=https://web.archive.org/web/20160303122125/https://play.google.com/store/apps/details?id=com.astroplayer |date=2016-03-03 }} 23. ^[https://play.google.com/store/apps/details?id=com.n7mobile.nplayer n7player Music Player (271,478) N7 Mobile Sp. z o.o. ] 24. ^[https://play.google.com/store/apps/details?id=com.n7mobile.nplayer_1 n7player 1.0 (8,816) N7 Mobile Sp. z o.o. ] 25. ^{{cite web|last1=Hindley|first1=Nathan|title=XMPlay 3.8.2|url=http://support.xmplay.com/files_view.php?file_id=670|website=XMPlay|publisher=Un4seen Developments|accessdate=11 July 2016}} External links
3 : Playlist file formats|Digital audio|Filename extensions |
|||||||||
随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识,基本涵盖了大多数领域的百科知识,是一部内容自由、开放的电子版国际百科全书。