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5.2 KiB
5.2 KiB
MP4 Box Structure
| Col1 | Col2 | Col3 | Col4 | Col5 | Col6 | Required | Description |
|---|---|---|---|---|---|---|---|
| ftyp | ✓ | file type and compatibility 文件类型和兼容性 |
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| pdin | progressive download information | ||||||
| moov | ✓ | container for all the metadata 所有元数据的容器 |
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| mvhd | ✓ | movie header, overall declarations 电影头，整体声明 |
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| trak | ✓ | container for an individual track or stream 单个轨或流的容器 |
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| tkhd | ✓ | track header, overall information about the track 轨的头部，关于该轨的概括信息，比如视频宽高 |
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| tref | track reference container | ||||||
| edts | edit list container | ||||||
| elst | an edit list | ||||||
| mdia | ✓ | container for the media information in a track 轨媒体信息的容器 |
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| mdhd | ✓ | media header, overall information about the media 媒体头，关于媒体的总体信息 |
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| hdlr | ✓ | handler, declares the media (handler) type 媒体的播放过程信息 |
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| minf | ✓ | media information container 媒体信息容器 |
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| vmhd | video media header, overall information (video track only) | ||||||
| hmhd | hint media header, overall information (hint track only) | ||||||
| nmhd | Null media header, overall information (some tracks only) | ||||||
| dinf | ✓ | data information box, container 数据信息box，容器 |
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| dref | ✓ | data reference box, declares source(s) of media data in track 如何定位媒体信息 |
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| stbl | ✓ | sample table box, container for the time/space map 包含了track中的sample的所有时间和位置信息，以及sample的编解码等信息 |
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| stsd | ✓ | sample descriptions (codec types, initialization etc.) 如果是视频，包含：编码类型、宽高、长度等信息； 如果是音频，包含：声道、采样率等信息 |
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| stts | ✓ | (decoding) time-to-sample 描述了sample时序的映射方法，我们可以通过它找到任何时间的sample |
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| ctts | (composition) time to sample | ||||||
| stsc | ✓ | sample-to-chunk, partial data-offset information 用chunk组织sample可以方便优化数据获取，一个chunk包含一个或多个sample |
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| stsz | sample sizes (framing) 每个sample的大小 虽然这里没有打勾，但对于mp4还是非常必要的 |
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| stz2 | compact sample sizes (framing) | ||||||
| stco | ✓ | chunk offset, partial data-offset information 定义了每个chunk在媒体流中的偏移位置 |
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| co64 | 64-bit chunk offset | ||||||
| stss | sync sample table (random access points) 用于确定media中的关键帧 |
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| stsh | shadow sync sample table | ||||||
| padb | sample padding bits | ||||||
| stdp | sample degradation priority | ||||||
| sdtp | independent and disposable samples | ||||||
| sbgp | sample-to-group | ||||||
| sgpd | sample group description | ||||||
| subs | sub-sample information | ||||||
| mvex | movie extends box | ||||||
| mehd | movie extends header box | ||||||
| trex | ✓ | track extends defaults | |||||
| ipmc | IPMP Control Box | ||||||
| moof | movie fragment | ||||||
| mfhd | ✓ | movie fragment header | |||||
| traf | track fragment | ||||||
| tfhd | ✓ | track fragment header | |||||
| trun | track fragment run | ||||||
| sdtp | independent and disposable samples | ||||||
| sbgp | sample-to-group subs sub-sample information | ||||||
| mfra | movie fragment random access | ||||||
| tfra | track fragment random access | ||||||
| mfro | ✓ | movie fragment random access offset | |||||
| mdat | media data container | ||||||
| free | free space | ||||||
| skip | free space | ||||||
| udta | user-data | ||||||
| cprt | copyright etc. | ||||||
| meta | metadata | ||||||
| hdlr | ✓ | handler, declares the metadata (handler) type | |||||
| dinf | data information box, container | ||||||
| dref | data reference box, declares source(s) of metadata items | ||||||
| ipmc | IPMP Control Box | ||||||
| iloc | item location | ||||||
| ipro | item protection | ||||||
| sinf | protection scheme information box | ||||||
| frma | original format box | ||||||
| imif | IPMP Information box | ||||||
| schm | scheme type box | ||||||
| schi | scheme information box | ||||||
| iinf | item information | ||||||
| xml | XML container | ||||||
| bxml | binary XML container | ||||||
| pitm | primary item reference | ||||||
| fiin | file delivery item information | ||||||
| paen | partition entry | ||||||
| fpar | file partition | ||||||
| fecr | FEC reservoir | ||||||
| segr | file delivery session group | ||||||
| gitn | group id to name | ||||||
| tsel | track selection | ||||||
| meco | additional metadata container | ||||||
| mere | metabox relation |
Source: MP4格式分析