关于MPEG-4 、mp4v 和 mp4a

MPEG-4

MPEG-4是个协议簇，包含了多个协议。

MPEG-4只是定义了一部分AAC类型，AAC主要包括MPEG-2 AAC和MPEG-4 AAC,详细如下图：

可以看出MPEG-4中只是定义了一部分类型的AAC。

MP4V

MP4V stands for MPEG-4 Video.
It was created by Moving Pictures Experts Group (MPEG) as a codec used to compress and decompress video data.
If you see "MP4V" in the context of a video file, it just means that the video was compressed with the MP4V codec.

MP4V是一种编码格式。

MP4V vs AVC

MPEG-4 is the general name for a set of specifications defined by ISO/IEC 14496.
There are several parts to this specification.
These are the relevant parts:
Part 2 - Commonly known as MPEG-4 Video, is a video compression format.
Part 3 - Commonly known as MPEG-4 Audio, is and audio compression format.
Part 10 - Commonly known as H264 or MPEG-4 AVC, is also a video compression format.
Part 14 - Commonly known as MP4, is a container format.
H.264 is typically considered to be the better for video compression.

MP4V在MPEG-4的第2部分MPEG-4 Video中定义。
AVC在MPEG-4的第10部分H264 or MPEG-4 AVC 定义。

另：MP4A在MPEG-4的第3部分MPEG-4 Audio中定义。

The biggest difference you will typically see is file size.
H.264 will typically be able to compress video at a much lower bitrate than the standard MPEG-4 codec.
You should be able to get comparable quality video with much smaller file sizes.

与MP4V相比，AVC具备更高的压缩效率。

MP4V vs MP4V-ES

MP4V-ES stands for MPEG-4 Video Elemental Stream.
MP4V differs from MP4V-ES in that the former is raw video data while the latter is RTP (real-time transport protocol) data that's already prepared to be sent over the RTP network protocol.

MP4V是原始视频数据。
MP4V-ES是RTP数据，可通过RTP协议进行传输。

References:

https://www.lifewire.com/mp4v-file-2622025
https://superuser.com/questions/118684/what-is-the-relation-between-the-mp4v-codec-and-the-h-264-format
https://en.wikipedia.org/wiki/MPEG-4
https://en.wikipedia.org/wiki/MPEG-4_Part_3

关于MPEG-4 、mp4v 和 mp4a相关推荐

常见文件mime类型
常见文件的mime类型,key为文件扩展名,value为mime类型,可另存为json文件随时查找. 取自tomcat9.0.12配置文件web.xml . {"123": &qu ...
文件对应的MIME类型
参考地址: http://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types return array('3dml'=& ...
各种文件后缀名对应content-type
## 各种文件后缀名对应content-type { "123": "application/vnd.lotus-1-2-3", "3dml" ...
Spring Boot文件下载断点续传
Spring Boot文件下载断点续传正文 MimeType映射关系正文 @RequestMapping(value = { "/downloading" }, method ...
文件后缀名和MimeType的映射关系
tomcat 的源码里边有. 打开 Tomcat官网在 Download 菜单下找一个版本,比如 Tomcat 9,点进去,下载源码找到 conf 目录下的 web.xml 文件打开,里边有很多 ...
史上最全的mime-type大全
原文地址:http://blog.haoji.me/mime-type.html?from=xa 什么是mime-type 简单来讲,它的作用就是服务器告诉浏览器你这个内容到底是个什么东东,是一张网页 ...
docx，pptx等正确的mime类型是什么？
对于较早的* .doc文档,这已足够: header("Content-Type: application/msword"); 我应该为新的docx文档使用哪种mime类型? 还可 ...
hls.js下载m3u8视频播放hls.js
1.新建hls.min.js空文件 2.将下面内容复制到空文件中 !function(t,e){"object"==typeof exports&&"ob ...
MPEG简介 + 如何计算CBR 和VBR的MP3的播放时间
1. 声明本文所写内容,多数整理自互联网,版权归原作者所有笔者知识有限,文中难免有误,欢迎批评指正,admin (at) crifan.com 觉得此文对你有帮助,想要发邮件来感谢的,也欢迎哈,^ ...

关于MPEG-4 、mp4v 和 mp4a

关于MPEG-4 、mp4v 和 mp4a相关推荐

最新文章

热门文章