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==Motivation==
This page aims to give an overview of the current state of metadata in Ogg and the ongoing projects towards improving it. The different components work in concert; for example [[Ogg Skeleton]] provides important infrastructure for [[CMML]], [[VorbisComment]] is simple to use and program, while the draft [[M3F|Multimedia Metadata Format (M3F)]] provides more sophisticated information.
 
== [[VorbisComment]]s ==


All the Xiph.org codecs have some internal mechanism for including metadata about the current stream.
All the Xiph.org codecs have some internal mechanism for including metadata about the current stream.
Generally, this is one of the codec headers, and in the words of the [http://www.xiph.org/ogg/vorbis/doc/v-comment.html vorbis spec],  
Generally, this is one of the codec headers, and in the words of the [http://www.xiph.org/vorbis/doc/v-comment.html vorbis spec],  
"It is meant for short, text comments...much like someone jotting a quick note on the bottom of a CDR."
"It is meant for short, text comments ... much like someone jotting a quick note on the bottom of a CDR." A single VorbisComment can store upto 2^64 bytes (16 exabytes).
 
VorbisComments store metadata describing the stream in key=value pairs, such as "ARTIST=Elvis", "TITLE=Blue Suede Shoes". Multiple copies of any given key are allowed (for example you can specify ARTIST several times for multiple performers). The specification has several suggested keys: TITLE, VERSION, ALBUM, TRACKNUMBER, ARTIST, PERFORMER, COPYRIGHT, LICENSE, ORGANIZATION, DESCRIPTION, GENRE, DATE, LOCATION, CONTACT, ISRC. See the [http://www.xiph.org/vorbis/doc/v-comment.html specification] for the intent of each one.
 
The [[VorbisComment]] page contains improvements to the suggested comment set.
 
== [[FLAC]] metadata blocks ==


This works well enough for most things, and can be overloaded/abused (depending on your point of view)
Metadata is included in the FLAC codec as METADATA_BLOCK_DATA. Seven types of metadata block are defined: 
for most other things. But there are three major requirements that point to the design of an external
#''METADATA_BLOCK_STREAMINFO'': Sample rate, number of channels, etc.
metadata format; one that can be interleaved with the other streams in a container.
#''METADATA_BLOCK_PADDING'': Nul padding.
#''METADATA_BLOCK_APPLICATION'': Third-party applications can register an ID. Metadata is typically 32-bit integers, but any datatypes can be specified.
#''METADATA_BLOCK_SEEKTABLE'': For one or more seek points.
#''METADATA_BLOCK_VORBIS_COMMENT'': Also known as FLAC tags, the contents of a VorbisComment packet. Note that the 32-bit field lengths are little-endian coded according to the Vorbis spec, as opposed to the usual big-endian coding of fixed-length integers in the rest of FLAC. FLAC metadata blocks are limited to 2^24 bytes (16 megabytes) and a VorbisComment packet in FLAC must fit within that limit.
#''METADATA_BLOCK_CUESHEET'': Typically, but not necessarily, for CD-DA (Red Book) cuesheets.
#''METADATA_BLOCK_PICTURE'': For binary picture data.


* ''Machinability'' There are a number of items of metadata that a player will want to parse and take action on. While there are usually 'convention' schemes for doing this with the embedded comment headers, this is much easier if there is a separate metadata stream designed for such use, instead of having to do best-effort parsing of natural language comments. For example, a video file with multiple audio tracks can specify the language of each one; a player than can parse these reliably can match them against a language preference list configured by the user to automatically select and begin playback of the best option.
== [[Ogg Skeleton]] ==


* ''Kitchen Sink'' There are a minority of people who care passionately about having every detail about a track available. In the sense of conserving such information, and providing an equivalent to liner notes for online distribution, this is a goal worth supporting. However, the simple unstructured key-value pairs offered by the inline metadata are unwieldy for this level of detail. How do you tell the 2nd unit Assistant Director from the USA unit Assistant Director? How do you indicate which artist played tenor sax in the solo?
[[Ogg Skeleton]] provides metadata useful for handling Ogg streams. This includes information like mime-types and mapping for granulepos which allows seeking streams without the need for the demuxer to understand them. The latest version, [[Ogg Skeleton 4]], also provides a keyframe index to enable faster seeking over high latency networks.


* ''Addressability'' The internal comment metadata headers are by necessity attached to a single content stream. This is useful for some appication, but a limitation in others. In a multiplexed stream, which set of comments refers to the collection as a whole? (By convention, in Ogg, it's the first logical bitstream occuring, but we can do better.) A separate metadata stream type must address this issue of collective metadata while still allowing description of individual streams. It should also allow temporal addressability, so that changes can be described. Because the in-stream comment metadata are part of the codec headers, it cannot change over the course of the stream, and allowing additional comment packets elsewhere in the stream presents seeking challenges. In the Ogg container this can be resolved by inserting a chain boundary, but this is a poor option for very-low-bitrate streams and unreliable transports such as RTP.
Ogg Skeleton allows for attachment of message header fields, given as name-value pairs, that contain some sort of protocol messages about the logical bitstream. This is intended for decode related stuff, such as the screen size for a video bitstream or the number of channels for an audio bitstream.


==Proposed Solutions==
== [[OggKate]] ==


RDF + dublin core
[[OggKate]] was originally designed for karaoke and text. The stream can carry text and images, and these can be animated.


XML-encoding (generic rdf or CMML?)
== [[CMML]] (deprecated) ==
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[http://www.shop263.com/i-48/652.htm 粉末涂装设备]
[http://www.shop263.com/i-48/653.htm 粉碎机]
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[http://www.shop263.com/i-48/762.htm 刮板式薄膜蒸发器]
[http://www.shop263.com/i-48/763.htm 刮刀下卸料离心机]
[http://www.shop263.com/i-48/764.htm 观片灯]
[http://www.shop263.com/i-48/765.htm 观片灯X射线胶片]
[http://www.shop263.com/i-48/766.htm 管道]
[http://www.shop263.com/i-48/767.htm 管道泵]
[http://www.shop263.com/i-48/768.htm 管道附件]
[http://www.shop263.com/i-48/769.htm 管道过滤器]
[http://www.shop263.com/i-48/770.htm 管道配件]
[http://www.shop263.com/i-48/771.htm 管道式无堵塞排污泵]
[http://www.shop263.com/i-48/772.htm 管道式自动增压泵]
[http://www.shop263.com/i-48/773.htm 管道特殊件]
[http://www.shop263.com/i-48/774.htm 管件]
[http://www.shop263.com/i-48/775.htm 管配件]
[http://www.shop263.com/i-48/776.htm 管式热交换器]
[http://www.shop263.com/i-48/777.htm 管束干燥机]
[http://www.shop263.com/i-48/778.htm 灌装机械]
[http://www.shop263.com/i-48/779.htm 罐内封闭阀门]
[http://www.shop263.com/i-48/780.htm 硅胶]
[http://www.shop263.com/i-48/781.htm 硅藻土精滤机]
[http://www.shop263.com/i-48/782.htm 癸二酸铵]
[http://www.shop263.com/i-48/783.htm 辊式破碎机]
[http://www.shop263.com/i-48/784.htm 辊式压力机]
[http://www.shop263.com/i-48/785.htm 滚滴浸绝缘处理设备]
[http://www.shop263.com/i-48/786.htm 滚筒干燥机]
[http://www.shop263.com/i-48/787.htm 滚筒干燥器]
[http://www.shop263.com/i-48/788.htm 锅炉]
[http://www.shop263.com/i-48/789.htm 国标储气桶]
[http://www.shop263.com/i-48/790.htm 过滤分离设备]
[http://www.shop263.com/i-48/791.htm 过滤机]
[http://www.shop263.com/i-48/792.htm 过滤器]
[http://www.shop263.com/i-48/793.htm 过滤器材设备]
[http://www.shop263.com/i-48/794.htm 过滤网]
[http://www.shop263.com/i-48/795.htm 含氮化合物]
[http://www.shop263.com/i-48/796.htm 含氟农药产品]
[http://www.shop263.com/i-48/797.htm 含氟新农药]
[http://www.shop263.com/i-48/798.htm 焊管]
[http://www.shop263.com/i-48/799.htm 焊管生产线]
[http://www.shop263.com/i-48/800.htm 焊接绝热气瓶]
[http://www.shop263.com/i-48/801.htm 合成氨]
[http://www.shop263.com/i-48/802.htm 黑液提取设备]
[http://www.shop263.com/i-48/803.htm 恒压变量自动给水控制设备]
[http://www.shop263.com/i-48/804.htm 喉管]
[http://www.shop263.com/i-48/805.htm 后整理设备]
[http://www.shop263.com/i-48/806.htm 呼吸阀]
[http://www.shop263.com/i-48/807.htm 呼吸人孔]
[http://www.shop263.com/i-48/808.htm 护栏网]
[http://www.shop263.com/i-48/809.htm 滑阀真空泵]
[http://www.shop263.com/i-48/800.htm 滑片式管道泵]
[http://www.shop263.com/i-48/811.htm 化成箔]
[http://www.shop263.com/i-48/812.htm 化工泵]
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[http://www.shop263.com/i-48/814.htm 化工反应釜]
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[http://www.shop263.com/i-48/817.htm 化工管道]
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[http://www.shop263.com/i-48/819.htm 化工离心泵]
[http://www.shop263.com/i-48/820.htm 化工设备]
[http://www.shop263.com/i-48/821.htm 化工试剂]
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[http://www.shop263.com/i-48/825.htm 化纤纺丝配件]
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[http://www.shop263.com/i-48/830.htm 环保工业用途的真空系统]
[http://www.shop263.com/i-48/831.htm 环保三废治理设备]
[http://www.shop263.com/i-48/832.htm 环保脱硫除尘设备]
[http://www.shop263.com/i-48/833.htm 环保型热熔胶]
[http://www.shop263.com/i-48/834.htm 环保用品]
[http://www.shop263.com/i-48/835.htm 环氧树脂真空浇注设备]
[http://www.shop263.com/i-48/836.htm 缓蚀剂]
[http://www.shop263.com/i-48/837.htm 换热]
[http://www.shop263.com/i-48/838.htm 换热器]
[http://www.shop263.com/i-48/839.htm 换热容器]
[http://www.shop263.com/i-48/840.htm 换热设备]
[http://www.shop263.com/i-48/841.htm 磺化设备]
[http://www.shop263.com/i-48/842.htm 回收净化]
[http://www.shop263.com/i-48/843.htm 混合机]
[http://www.shop263.com/i-48/844.htm 混料机]
[http://www.shop263.com/i-48/845.htm 混流式喷雾干燥机]
[http://www.shop263.com/i-48/846.htm 活塞推料离心机]
[http://www.shop263.com/i-48/847.htm 活性磷酸钙]
[http://www.shop263.com/i-48/848.htm 活性炭]
[http://www.shop263.com/i-48/849.htm 活性炭过滤器]
[http://www.shop263.com/i-48/850.htm 活性碳过滤网]
[http://www.shop263.com/i-48/851.htm 活性碳口罩]
[http://www.shop263.com/i-48/852.htm 活性碳酸钙]
[http://www.shop263.com/i-48/853.htm 活性氧化铝]
[http://www.shop263.com/i-48/854.htm 活性氧化铝球]
[http://www.shop263.com/i-48/855.htm 火灾逃生面具]
[http://www.shop263.com/i-48/856.htm 机械粉碎机]
[http://www.shop263.com/i-48/857.htm 机械过滤器]
[http://www.shop263.com/i-48/858.htm 机械密封件]
[http://www.shop263.com/i-48/859.htm 机械式单缸热熔釜]
[http://www.shop263.com/i-48/860.htm 机械式双缸热熔釜]
[http://www.shop263.com/i-48/861.htm 机械式无级变速器]
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[http://www.touchweb.com.cn/webpage/1.htm 触摸屏]
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CMML is not used anymore; use [[OggKate]] instead. The [[CMML|Continuous Media Markup Language]] allowed time-based marking up of media streams, at its simplest this allowed you to divide media files into clips and provide information about each clip.


== [[M3F]] (unused draft) ==


[[M3F|Multimedia Metadata Format]] is not being developed anymore; use [[VorbisComment]] instead.


The format was intended to replace VorbisComments for the use of ''structured'' metadata, allowing VorbisComments to revert to its orginally intended use of "short, text comments ... much like someone jotting a quick note on the bottom of a CDR."


[[M3F]] for the Ogg container was a draft specification which aimed to provide metadata for media streams. The exact aims of this project were still under development, but they included being able to describe artist relationships to a piece more accurately as well as providing the structure to encourage more reliable metadata.


== [[XMLEmbedding]] (unused draft) ==


To implement XML metadata in Ogg (as for [[M3F]]), a mapping to Ogg streams is needed. The use of XML metadata will also open the way for the inclusion of technologies such as:
* RDF + dublin core
* [http://www.adobe.com/products/xmp/ XMP]
* [http://wiki.musicbrainz.org/MusicBrainzXMLMetaData MusicBrainz]
* [http://www.w3.org/Graphics/SVG/ SVG]
This specification is still not past the discussion stage.


[http://www.shop263.com/i-49/1.htm 铜合金]
== Aims of advanced metadata ==
[http://www.shop263.com/i-49/2.htm 铜缓蚀剂]
[http://www.shop263.com/i-49/3.htm 铜金缓蚀剂]
[http://www.shop263.com/i-49/4.htm 铜金清洗剂]
[http://www.shop263.com/i-49/5.htm 铜线拉丝油]
[http://www.shop263.com/i-49/6.htm 透明成核剂
[http://www.shop263.com/i-49/7.htm 透明树脂涂料]
[http://www.shop263.com/i-49/8.htm 涂布树脂]
[http://www.shop263.com/i-49/9.htm 涂料催干剂]
[http://www.shop263.com/i-49/10.htm 涂料耐水剂]
[http://www.shop263.com/i-49/11.htm 涂料润滑剂]
[http://www.shop263.com/i-49/12.htm 涂料油漆油墨防结皮剂]
[http://www.shop263.com/i-49/13.htm 涂料助剂]
[http://www.shop263.com/i-49/14.htm 吐温]
[http://www.shop263.com/i-49/15.htm 脱蜡]
[http://www.shop263.com/i-49/16.htm 脱硫醇活化剂]
[http://www.shop263.com/i-49/17.htm 脱硫催化剂]
[http://www.shop263.com/i-49/18.htm 脱硫剂]
[http://www.shop263.com/i-49/19.htm 脱硫消泡剂]
[http://www.shop263.com/i-49/20.htm 脱硫用煤质颗粒活性炭]
[http://www.shop263.com/i-49/21.htm 脱膜剂]
[http://www.shop263.com/i-49/22.htm 脱墨剂]
[http://www.shop263.com/i-49/23.htm 脱漆]
[http://www.shop263.com/i-49/24.htm 脱漆剂]
[http://www.shop263.com/i-49/25.htm 脱色炭]
[http://www.shop263.com/i-49/26.htm 脱塑剂]
[http://www.shop263.com/i-49/27.htm 脱碳剂]
[http://www.shop263.com/i-49/28.htm 脱脂剂]
[http://www.shop263.com/i-49/29.htm 外墙瓷砖清洗剂]
[http://www.shop263.com/i-49/30.htm 烷环酸锌]
[http://www.shop263.com/i-49/31.htm 烷基酚]
[http://www.shop263.com/i-49/32.htm 烷基和芳基硅烷]
[http://www.shop263.com/i-49/33.htm 万能催干剂]
[http://www.shop263.com/i-49/34.htm 味精炭]
[http://www.shop263.com/i-49/35.htm 稳定剂]
[http://www.shop263.com/i-49/36.htm 涡轮机油]
[http://www.shop263.com/i-49/37.htm 肟类精细]
[http://www.shop263.com/i-49/38.htm 污染控制]
[http://www.shop263.com/i-49/39.htm 污水处理剂]
[http://www.shop263.com/i-49/40.htm 污水处理用铁粉]
[http://www.shop263.com/i-49/41.htm 无毒性钙一锌安定剂]
[http://www.shop263.com/i-49/42.htm 无毒亚磷酸酯]
[http://www.shop263.com/i-49/43.htm 无毒液体稳定剂]
[http://www.shop263.com/i-49/44.htm 无机氟化物]
[http://www.shop263.com/i-49/45.htm 无机磷酸盐]
[http://www.shop263.com/i-49/46.htm 无机试剂]
[http://www.shop263.com/i-49/47.htm 无机阻燃剂]
[http://www.shop263.com/i-49/48.htm 无甲醛抗水剂]
[http://www.shop263.com/i-49/49.htm 无水氟化钾]
[http://www.shop263.com/i-49/50.htm 无水六氟磷酸锂]
[http://www.shop263.com/i-49/51.htm 无水氯化锶]
[http://www.shop263.com/i-49/52.htm 无烟媒]
[http://www.shop263.com/i-49/53.htm 五甲基哌啶醇]
[http://www.shop263.com/i-49/54.htm 五水偏硅酸钠]
[http://www.shop263.com/i-49/55.htm 五氧化二钒]
[http://www.shop263.com/i-49/56.htm 戊二酸]
[http://www.shop263.com/i-49/57.htm 戊二酸酐]
[http://www.shop263.com/i-49/58.htm 戊酮]
[http://www.shop263.com/i-49/59.htm 雾化硅油]
[http://www.shop263.com/i-49/60.htm 吸附剂]
[http://www.shop263.com/i-49/61.htm 矽利康助剂]
[http://www.shop263.com/i-49/62.htm 稀释剂]
[http://www.shop263.com/i-49/63.htm 稀土金属萃取剂]
[http://www.shop263.com/i-49/64.htm 洗涤剂]
[http://www.shop263.com/i-49/65.htm 洗涤助剂]
[http://www.shop263.com/i-49/66.htm 洗和脱脂剂]
[http://www.shop263.com/i-49/67.htm 洗洁剂]
[http://www.shop263.com/i-49/68.htm 膨润土粉]
[http://www.shop263.com/i-49/69.htm 系磷化]
[http://www.shop263.com/i-49/70.htm 细结构石墨棒]
[http://www.shop263.com/i-49/71.htm 纤维加工助剂]
[http://www.shop263.com/i-49/72.htm 香蕉水]
[http://www.shop263.com/i-49/73.htm 香兰素]
[http://www.shop263.com/i-49/74.htm 橡胶]
[http://www.shop263.com/i-49/75.htm 橡胶促进剂]
[http://www.shop263.com/i-49/76.htm 橡胶防老剂]
[http://www.shop263.com/i-49/77.htm 橡胶分散剂]
[http://www.shop263.com/i-49/78.htm 橡胶流动助剂]
[http://www.shop263.com/i-49/79.htm 橡胶硫化]
[http://www.shop263.com/i-49/80.htm 橡胶硫化促进剂]
[http://www.shop263.com/i-49/81.htm 橡胶内脱模剂]
[http://www.shop263.com/i-49/82.htm 橡胶软化剂]
[http://www.shop263.com/i-49/83.htm 橡胶粘合剂]
[http://www.shop263.com/i-49/84.htm 橡皮布还原清洗剂]
[http://www.shop263.com/i-49/85.htm 橡塑脱模剂]
[http://www.shop263.com/i-49/86.htm 橡塑助剂]
[http://www.shop263.com/i-49/87.htm 消毒剂]
[http://www.shop263.com/i-49/88.htm 消光固化剂]
[http://www.shop263.com/i-49/89.htm 消光剂]
[http://www.shop263.com/i-49/90.htm 消泡剂]
[http://www.shop263.com/i-49/91.htm 硝基漆稀释剂]
[http://www.shop263.com/i-49/92.htm 硝酸]
[http://www.shop263.com/i-49/93.htm 硝酸铵]
[http://www.shop263.com/i-49/94.htm 硝酸钙]
[http://www.shop263.com/i-49/95.htm 硝酸盐]
[http://www.shop263.com/i-49/96.htm 鞋材]
[http://www.shop263.com/i-49/97.htm 辛醇]
[http://www.shop263.com/i-49/98.htm 锌铬黄]
[http://www.shop263.com/i-49/99.htm 锌系磷化工艺]
[http://www.shop263.com/i-49/100.htm 锅炉水除氧剂]
[http://www.shop263.com/i-49/101.htm 新型化学助剂]
[http://www.shop263.com/i-49/102.htm 杏壳]
[http://www.shop263.com/i-49/103.htm 溴化氢]
[http://www.shop263.com/i-49/104.htm 絮凝剂]
[http://www.shop263.com/i-49/105.htm 压块活性炭]
[http://www.shop263.com/i-49/106.htm 压缩机油]
[http://www.shop263.com/i-49/107.htm 压缩机转子]
[http://www.shop263.com/i-49/108.htm 亚磷酸]
[http://www.shop263.com/i-49/109.htm 亚磷酸酯]
[http://www.shop263.com/i-49/110.htm 亚硝酸钙]
[http://www.shop263.com/i-49/111.htm 盐酸]
[http://www.shop263.com/i-49/112.htm 颜料糊]
[http://www.shop263.com/i-49/113.htm 厌氧]
[http://www.shop263.com/i-49/114.htm 阳离子型聚丙烯酰胺]
[http://www.shop263.com/i-49/115.htm 阳离子荧光增白剂]
[http://www.shop263.com/i-49/116.htm 阳离子有机高分子絮凝剂]
[http://www.shop263.com/i-49/117.htm 氧化钙]
[http://www.shop263.com/i-49/118.htm 氧化铬绿]
[http://www.shop263.com/i-49/119.htm 氧化聚乙烯蜡]
[http://www.shop263.com/i-49/120.htm 氧化锑]
[http://www.shop263.com/i-49/121.htm 氧化铁红]
[http://www.shop263.com/i-49/122.htm 氧化铁绿]
[http://www.shop263.com/i-49/123.htm 氧化退浆剂]
[http://www.shop263.com/i-49/124.htm 氧化锌脱硫剂]
[http://www.shop263.com/i-49/125.htm 氧化锌预分散体]
[http://www.shop263.com/i-49/126.htm 氧化制合成气催化剂]
[http://www.shop263.com/i-49/127.htm 氧气]
[http://www.shop263.com/i-49/128.htm 药剂]
[http://www.shop263.com/i-49/129.htm 药物原料]
[http://www.shop263.com/i-49/130.htm 药物中间体]
[http://www.shop263.com/i-49/131.htm 药用活性炭]
[http://www.shop263.com/i-49/132.htm 药用氯化钾]
[http://www.shop263.com/i-49/133.htm 药用炭]
[http://www.shop263.com/i-49/134.htm 药用铁粉]
[http://www.shop263.com/i-49/135.htm 椰壳]
[http://www.shop263.com/i-49/136.htm 液碱]
[http://www.shop263.com/i-49/137.htm 液蜡]
[http://www.shop263.com/i-49/138.htm 液氯]
[http://www.shop263.com/i-49/139.htm 液态甲基四氢苯酐固化剂]
[http://www.shop263.com/i-49/140.htm 液体二氧化硫]
[http://www.shop263.com/i-49/141.htm 液体二氧化碳]
[http://www.shop263.com/i-49/142.htm 液体复合热稳定剂]
[http://www.shop263.com/i-49/143.htm 液体活性溴杀生剂]
[http://www.shop263.com/i-49/144.htm 液体硫转移助剂]
[http://www.shop263.com/i-49/145.htm 液体矽利康]
[http://www.shop263.com/i-49/146.htm 液体荧光增白剂]
[http://www.shop263.com/i-49/147.htm 液压油]
[http://www.shop263.com/i-49/148.htm 液状石蜡]
[http://www.shop263.com/i-49/149.htm 一氯蒽醌]
[http://www.shop263.com/i-49/150.htm 医药化工]
[http://www.shop263.com/i-49/151.htm 医药原料]
[http://www.shop263.com/i-49/152.htm 医药中间体]
[http://www.shop263.com/i-49/153.htm 依那普利氢化物酸酐]
[http://www.shop263.com/i-49/154.htm 仪器设备]
[http://www.shop263.com/i-49/155.htm 乙苯脱氢催化剂]
[http://www.shop263.com/i-49/156.htm 乙丙共聚物粘度指数改进剂]
[http://www.shop263.com/i-49/157.htm 乙丙橡胶]
[http://www.shop263.com/i-49/158.htm 乙二醇醋酸酯]
[http://www.shop263.com/i-49/159.htm 乙二醇二甲醚]
[http://www.shop263.com/i-49/160.htm 乙二醇二甲酸酯]
[http://www.shop263.com/i-49/161.htm 乙二醇二乙醚]
[http://www.shop263.com/i-49/162.htm 乙二醇甲醚]
[http://www.shop263.com/i-49/163.htm 乙二醇醚]
[http://www.shop263.com/i-49/164.htm 乙二醇双硬脂酸酯]
[http://www.shop263.com/i-49/165.htm 乙基]
[http://www.shop263.com/i-49/166.htm 乙基蒽醌]
[http://www.shop263.com/i-49/167.htm 乙基己酯]
[http://www.shop263.com/i-49/168.htm 乙烯基官能团硅烷]
[http://www.shop263.com/i-49/169.htm 乙酰基柠檬酸三正丁酯]
[http://www.shop263.com/i-49/170.htm 乙酯]
[http://www.shop263.com/i-49/171.htm 异丙苯]
[http://www.shop263.com/i-49/172.htm 异丙醚]
[http://www.shop263.com/i-49/173.htm 异丁醇]
[http://www.shop263.com/i-49/174.htm 异丁烯]
[http://www.shop263.com/i-49/175.htm 异氰酸正丁酯]
[http://www.shop263.com/i-49/176.htm 异辛酸]
[http://www.shop263.com/i-49/177.htm 阴极电泳涂料]
[http://www.shop263.com/i-49/178.htm 阴离子表面活性剂]
[http://www.shop263.com/i-49/179.htm 阴离子型聚丙烯酰胺]
[http://www.shop263.com/i-49/180.htm 銀系無機紡織整理劑]
[http://www.shop263.com/i-49/181.htm 印染助剂]
[http://www.shop263.com/i-49/182.htm 荧光颜料]
[http://www.shop263.com/i-49/183.htm 荧光增白剂]
[http://www.shop263.com/i-49/184.htm 萤石]
[http://www.shop263.com/i-49/185.htm 硬化剂]
[http://www.shop263.com/i-49/186.htm 硬脂酸]
[http://www.shop263.com/i-49/187.htm 硬脂酸丁酯]
[http://www.shop263.com/i-49/188.htm 硬脂酸钙]
[http://www.shop263.com/i-49/189.htm 硬脂酸酰胺]
[http://www.shop263.com/i-49/190.htm 硬脂酸盐]
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[http://www.shop263.com/i-49/193.htm 油剂]
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[http://www.shop263.com/i-49/217.htm 有碘化物]
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[http://www.shop263.com/i-49/219.htm 有机硅材料]
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[http://www.shop263.com/i-49/229.htm 有机铅稳定剂]
[http://www.shop263.com/i-49/230.htm 有机试剂]
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[http://www.shop263.com/i-49/232.htm 有机颜料]
[http://www.shop263.com/i-49/233.htm 有机载热体]
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[http://www.shop263.com/i-49/245.htm 暂时性湿强剂]
[http://www.shop263.com/i-49/246.htm 早强剂]
[http://www.shop263.com/i-49/247.htm 造纸分散剂]
[http://www.shop263.com/i-49/248.htm 造纸化学品]
[http://www.shop263.com/i-49/249.htm 造纸湿强剂]
[http://www.shop263.com/i-49/250.htm 造纸用糊料]
[http://www.shop263.com/i-49/251.htm 造纸增强剂]
[http://www.shop263.com/i-49/252.htm 造纸助剂]
[http://www.shop263.com/i-49/253.htm 增白剂]
[http://www.shop263.com/i-49/254.htm 增稠剂]
[http://www.shop263.com/i-49/255.htm 增光剂]
[http://www.shop263.com/i-49/256.htm 增强剂]
[http://www.shop263.com/i-49/257.htm 增韧剂]
[http://www.shop263.com/i-49/258.htm 增塑剂]
[http://www.shop263.com/i-49/259.htm 增塑剂油性润滑材料]
[http://www.shop263.com/i-49/260.htm 渣油阻垢剂]
[http://www.shop263.com/i-49/261.htm 粘度甲基硅油]
[http://www.shop263.com/i-49/262.htm 粘胶基活性炭纤维]
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[http://www.shop263.com/i-49/264.htm 粘胶树脂]
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[http://www.shop263.com/i-49/280.htm 指示剂]
[http://www.shop263.com/i-49/281.htm 制动液]
[http://www.shop263.com/i-49/282.htm 制冷剂]
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[http://www.shop263.com/i-49/284.htm 中高档润滑油]
[http://www.shop263.com/i-49/285.htm 中铬黄]
[http://www.shop263.com/i-49/286.htm 中和缓蚀剂]
[http://www.shop263.com/i-49/287.htm 中间体]
[http://www.shop263.com/i-49/288.htm 中脱剂]
[http://www.shop263.com/i-49/289.htm 中性酯蜡]
[http://www.shop263.com/i-49/290.htm 终止剂]
[http://www.shop263.com/i-49/291.htm 仲辛醇]
[http://www.shop263.com/i-49/292.htm 重氮]
[http://www.shop263.com/i-49/293.htm 重铬酸钾]
[http://www.shop263.com/i-49/294.htm 重晶石矿粉]
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[http://www.shop263.com/i-49/297.htm 重质正构烷烃]
[http://www.shop263.com/i-49/298.htm 珠光剂]
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[http://www.shop263.com/i-49/323.htm 工业地板]
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[http://www.shop263.com/i-49/327.htm 氯化聚乙烯]
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[http://www.shop263.com/i-49/329.htm 氯化石蜡]
[http://www.shop263.com/i-49/330.htm 氯化石蜡油]
[http://www.shop263.com/i-49/331.htm 氯化锶]
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[http://www.shop263.com/i-49/333.htm 氯化亚砜]
[http://www.shop263.com/i-49/334.htm 氯化亚铁]
[http://www.shop263.com/i-49/335.htm 氯磺化聚乙烯]
[http://www.shop263.com/i-49/336.htm 烃油乳液型消泡剂]
[http://www.shop263.com/i-49/337.htm 通用化学试剂]
[http://www.shop263.com/i-49/338.htm 天然真石漆]
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VorbisComments work well enough for most things, and can be overloaded/abused (depending on your point of view) for most other things. But there are three major requirements that point to the design of an external metadata format; one that can be interleaved with the other streams in a container.


* '''Machinability:''' There are a number of items of metadata that a player will want to parse and take action on. While there are usually 'convention' schemes for doing this with the embedded comment headers, this is much easier if there is a separate metadata stream designed for such use, instead of having to do best-effort parsing of natural language comments. For example, a video file with multiple audio tracks can specify the language of each one; a player than can parse these reliably can match them against a language preference list configured by the user to automatically select and begin playback of the best option.


* '''Kitchen Sink:''' There are a minority of people who care passionately about having every detail about a track available. In the sense of conserving such information, and providing an equivalent to liner notes for online distribution, this is a goal worth supporting. However, the simple unstructured key-value pairs offered by the inline metadata are unwieldy for this level of detail. How do you tell the 2nd unit Assistant Director from the USA unit Assistant Director? How do you indicate which artist played tenor sax in the solo?


http://www.shop263.com/i-49/1.htm
* '''Addressability:''' The internal comment metadata headers are by necessity attached to a single content stream. This is useful for some appication, but a limitation in others. In a multiplexed stream, which set of comments refers to the collection as a whole? (By convention, in Ogg, it's the first logical bitstream occuring, but we can do better.) A separate metadata stream type must address this issue of collective metadata while still allowing description of individual streams. It should also allow temporal addressability, so that changes can be described. Because the in-stream comment metadata are part of the codec headers, it cannot change over the course of the stream, and allowing additional comment packets elsewhere in the stream presents seeking challenges. In the Ogg container this can be resolved by inserting a chain boundary, but this is a poor option for very-low-bitrate streams and unreliable transports such as RTP.
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Latest revision as of 12:44, 24 July 2013

This page aims to give an overview of the current state of metadata in Ogg and the ongoing projects towards improving it. The different components work in concert; for example Ogg Skeleton provides important infrastructure for CMML, VorbisComment is simple to use and program, while the draft Multimedia Metadata Format (M3F) provides more sophisticated information.

VorbisComments

All the Xiph.org codecs have some internal mechanism for including metadata about the current stream. Generally, this is one of the codec headers, and in the words of the vorbis spec, "It is meant for short, text comments ... much like someone jotting a quick note on the bottom of a CDR." A single VorbisComment can store upto 2^64 bytes (16 exabytes).

VorbisComments store metadata describing the stream in key=value pairs, such as "ARTIST=Elvis", "TITLE=Blue Suede Shoes". Multiple copies of any given key are allowed (for example you can specify ARTIST several times for multiple performers). The specification has several suggested keys: TITLE, VERSION, ALBUM, TRACKNUMBER, ARTIST, PERFORMER, COPYRIGHT, LICENSE, ORGANIZATION, DESCRIPTION, GENRE, DATE, LOCATION, CONTACT, ISRC. See the specification for the intent of each one.

The VorbisComment page contains improvements to the suggested comment set.

FLAC metadata blocks

Metadata is included in the FLAC codec as METADATA_BLOCK_DATA. Seven types of metadata block are defined:

  1. METADATA_BLOCK_STREAMINFO: Sample rate, number of channels, etc.
  2. METADATA_BLOCK_PADDING: Nul padding.
  3. METADATA_BLOCK_APPLICATION: Third-party applications can register an ID. Metadata is typically 32-bit integers, but any datatypes can be specified.
  4. METADATA_BLOCK_SEEKTABLE: For one or more seek points.
  5. METADATA_BLOCK_VORBIS_COMMENT: Also known as FLAC tags, the contents of a VorbisComment packet. Note that the 32-bit field lengths are little-endian coded according to the Vorbis spec, as opposed to the usual big-endian coding of fixed-length integers in the rest of FLAC. FLAC metadata blocks are limited to 2^24 bytes (16 megabytes) and a VorbisComment packet in FLAC must fit within that limit.
  6. METADATA_BLOCK_CUESHEET: Typically, but not necessarily, for CD-DA (Red Book) cuesheets.
  7. METADATA_BLOCK_PICTURE: For binary picture data.

Ogg Skeleton

Ogg Skeleton provides metadata useful for handling Ogg streams. This includes information like mime-types and mapping for granulepos which allows seeking streams without the need for the demuxer to understand them. The latest version, Ogg Skeleton 4, also provides a keyframe index to enable faster seeking over high latency networks.

Ogg Skeleton allows for attachment of message header fields, given as name-value pairs, that contain some sort of protocol messages about the logical bitstream. This is intended for decode related stuff, such as the screen size for a video bitstream or the number of channels for an audio bitstream.

OggKate

OggKate was originally designed for karaoke and text. The stream can carry text and images, and these can be animated.

CMML (deprecated)

CMML is not used anymore; use OggKate instead. The Continuous Media Markup Language allowed time-based marking up of media streams, at its simplest this allowed you to divide media files into clips and provide information about each clip.

M3F (unused draft)

Multimedia Metadata Format is not being developed anymore; use VorbisComment instead.

The format was intended to replace VorbisComments for the use of structured metadata, allowing VorbisComments to revert to its orginally intended use of "short, text comments ... much like someone jotting a quick note on the bottom of a CDR."

M3F for the Ogg container was a draft specification which aimed to provide metadata for media streams. The exact aims of this project were still under development, but they included being able to describe artist relationships to a piece more accurately as well as providing the structure to encourage more reliable metadata.

XMLEmbedding (unused draft)

To implement XML metadata in Ogg (as for M3F), a mapping to Ogg streams is needed. The use of XML metadata will also open the way for the inclusion of technologies such as:

This specification is still not past the discussion stage.

Aims of advanced metadata

VorbisComments work well enough for most things, and can be overloaded/abused (depending on your point of view) for most other things. But there are three major requirements that point to the design of an external metadata format; one that can be interleaved with the other streams in a container.

  • Machinability: There are a number of items of metadata that a player will want to parse and take action on. While there are usually 'convention' schemes for doing this with the embedded comment headers, this is much easier if there is a separate metadata stream designed for such use, instead of having to do best-effort parsing of natural language comments. For example, a video file with multiple audio tracks can specify the language of each one; a player than can parse these reliably can match them against a language preference list configured by the user to automatically select and begin playback of the best option.
  • Kitchen Sink: There are a minority of people who care passionately about having every detail about a track available. In the sense of conserving such information, and providing an equivalent to liner notes for online distribution, this is a goal worth supporting. However, the simple unstructured key-value pairs offered by the inline metadata are unwieldy for this level of detail. How do you tell the 2nd unit Assistant Director from the USA unit Assistant Director? How do you indicate which artist played tenor sax in the solo?
  • Addressability: The internal comment metadata headers are by necessity attached to a single content stream. This is useful for some appication, but a limitation in others. In a multiplexed stream, which set of comments refers to the collection as a whole? (By convention, in Ogg, it's the first logical bitstream occuring, but we can do better.) A separate metadata stream type must address this issue of collective metadata while still allowing description of individual streams. It should also allow temporal addressability, so that changes can be described. Because the in-stream comment metadata are part of the codec headers, it cannot change over the course of the stream, and allowing additional comment packets elsewhere in the stream presents seeking challenges. In the Ogg container this can be resolved by inserting a chain boundary, but this is a poor option for very-low-bitrate streams and unreliable transports such as RTP.