Motion JPEG 的规格是什么？
我疯狂地谷歌搜索，找不到 mjpeg 的任何文件格式规范。
标题应该是什么样子？ 我是否只是在标题后附加一系列 jpeg？
我知道它通常位于 .avi 容器中，它是否有可能包含在其中的编解码器的标准化格式？
我们的目标是在 ActionScript 3 中实现它，但也可以从其他语言移植。 我尝试过查看 ffmpeg 和 mplayer，但 c 还不是我的强项。
任何建议，将不胜感激！
I've been googling like mad and can't find any file format specifications for mjpeg.
What should the header look like?
Do i just append a series of jpegs after the header?
I know it's the usually in the .avi container, does that have a standardized format for codecs that might be in it?
The goal is to make it in actionscript 3, but other languages would be good to port from. I've tried looking at ffmpeg and mplayer but c is not my strong side (yet).
Any suggestions would be appreciated!
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没有官方标准。
实际上，以最简单的形式，mjpeg 只是 jpeg 文件的串联，在同一文件中一个接一个。
ffmpeg 使用
-f mjpeg或-vcodec mjpeg开关支持此功能。如果后续图像无法提供替换，解码多个图像的 JPEG 解码器应记住并使用相同的 jpeg 表。 jpeg 标准将其描述为“缩写 jpeg 流”，并且 libjpeg 支持这一点。
因此，mjpeg 可能包含完整的 jpeg 图像，然后是后续的 SOI..EOI 块，这些块未指定与前一帧重复的标头。
There isn't an official standard.
In practice, in its simplest form, an mjpeg is just a concatenation of jpeg files, one after the other in the same file.
ffmpeg supports this using the
-f mjpegor-vcodec mjpegswitches.JPEG decoders that decode multiple images should remember and use the same jpeg tables for subsequent images if those images fail to provide replacements. The jpeg standard describes this as 'abbreviated jpeg streams', and libjpeg supports this.
So an mjpeg might contain a full jpeg image, and then subsequent SOI..EOI blocks that do not specify those headers that are duplicates to the previous frame.
显然没有单一的规范。 来自维基百科：
Apparently there is no single specifiaction. From wikipedia:
IETF 将标准定义为 RFC 2435。 我不知道哪些编解码器将支持此功能，但这似乎是数据规范。
The IETF has the standard defined as RFC 2435. I don't know what codecs will support this, but this appears to be the data spec.
没有单一的官方规范。 但有些公司制定了自己的规范：
QuickTime File Format Specific (https://developer.apple.com/library/content/documentation/QuickTime/QTFF/QTFFPreface/qtffPreface.html)
Motion JPEG 格式，QuickTime M-JPEG 规范 (http://staticky.com/dl/ftp.apple.com /developer/Development_Kits/QuickTime/Programming_Stuff/Documentation/QuickTime-JPEGSpec.pdf)
Microsoft OpenDML AVI 文件格式扩展 (http://www.jmcgowan.com/odmlff2.pdf)
There is no single official specification. But some company made their own specification:
QuickTime File Format Specification (https://developer.apple.com/library/content/documentation/QuickTime/QTFF/QTFFPreface/qtffPreface.html)
Motion JPEG Format, QuickTime M-JPEG Specification (http://staticky.com/dl/ftp.apple.com/developer/Development_Kits/QuickTime/Programming_Stuff/Documentation/QuickTime-JPEGSpec.pdf)
Microsoft OpenDML AVI File Format Extensions (http://www.jmcgowan.com/odmlff2.pdf)
MJPEG over HTTP 至少有一个相当标准的实现。 它作为多部分 HTTP 响应返回。
维基百科文章讨论了确切的机制：
https://en.wikipedia.org/wiki/ Motion_JPEG#M-JPEG_over_HTTP
MJPEG over HTTP at least has a pretty standard implementation. It is returned as a multi-part HTTP response.
The Wikipedia article discusses the exact mechanism:
https://en.wikipedia.org/wiki/Motion_JPEG#M-JPEG_over_HTTP
你可以在网上其他地方找到这个文档，但我不知道哪个是权威来源：
http://www.cajunbot.com/wiki/images/7 /71/USB_Video_Payload_MJPEG_1.1.pdf
You can find this document in other places on the Net though I don't know which one is an authoritative source:
http://www.cajunbot.com/wiki/images/7/71/USB_Video_Payload_MJPEG_1.1.pdf
在 Motion JPEG 中，数字视频序列的每个视频帧或隔行扫描场都被单独压缩为 JPEG 图像。 因此，每个帧的规格（例如品质因数）存储在 It's Header 中。 换句话说，你的问题简化为：“如何读取视频中帧的标题？”
也许您可以使用 Phil Sallee 的 JPEG Toolbax。 请注意，它有一些读取/写入 jpeg 图像的功能，还有一些显示 DCT 矩阵、质量因数、霍夫曼编码表等的功能。
如果您发现如何在视频中使用此功能和/或如何读取 MJPEG 视频的规范请分享我们
In Motion JPEG each video frame or interlaced field of a digital video sequence is compressed separately as a JPEG image. So specification of each frame (such as quality factor) stored in It's Header. in another words your problem reduced to this : "How to read header of a frame in a video?"
Maybe you can use Phil Sallee's JPEG Toolbax. Note that it has some function to read/write a jpeg image and some to display DCT Matrices,Quality Factor,Huffman Coding Tables , etc.
If you find how to use this function in video and/or how to read specification of a MJPEG video please share us
经过很多天的互联网搜索，我也找不到完整的文档，也找不到文件协议的二进制示例。
有关我迄今为止找到的信息最丰富的资源，请参阅
http://www.digitalpreservation.gov/formats/fdd/fdd000127.shtml
（Motion JPEG 2000 文件格式 - 最后有许多“有用的参考 URL”，包括“Motion JPEG2000 概述”，它至少在某种程度上回答了这个问题）。
您会发现 Apple MOV PDF 比比皆是，其中显然包含 Motion JPEG，但需要数周时间才能破译。 我只能向其他人建议，上面的 URL 是进一步研究的良好起点。
After many days of Internet searching, I could not find full documentation either, nor a binary example of the file protocol.
For the most informative resource I have found so far, see
http://www.digitalpreservation.gov/formats/fdd/fdd000127.shtml
(Motion JPEG 2000 File Format -- has many "Useful references URLs" at end including "Overview of Motion JPEG2000" which at least go some way towards answering the question).
You will find Apple MOV PDF's abound, which apparently encompasses Motion JPEG, but it would take weeks to decipher. I can only suggest to others that the above URL is a good starting place for further research.