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Introduction
Video Container Format and Video Compression Format are two different but related concepts, which together form the structure of digital video files.
Video Container Format
Video encapsulation format is a file format used to encapsulate multimedia data, including video, audio, subtitles, metadata, etc. What it does is combine these different types of media data into a single file so that a player or decoder can recognize and process them.
Video encapsulation format usually includes a file header (Header) and multiple media streams (such as video stream, audio stream, subtitle stream, etc.). They can also contain file-level metadata, such as file size, duration, production date, and other information.
Some common video encapsulation formats include MP4 (MPEG-4 Part 14), MKV (Matroska), AVI (Audio Video Interleave), MOV (QuickTime File Format), etc.
Video Compression Format
The video encoding format is a compression technology used to reduce the size of video files while maintaining adequate visual quality. Video encoding compresses and encodes video frames to reduce the amount of data, thereby reducing storage requirements and transmission bandwidth.
Different video encoding formats use different compression algorithms, such as H.264, H.265 (HEVC), VP9, AVC, MPEG-2, etc. These encoding formats can set different parameters when encoding to trade off video quality and file size.
Video encoding formats generally define how video frames are encoded and decoded, and how compressed data is processed.
The relationship between the two
There is a close relationship between video packaging formats and video encoding formats, as video files typically contain a video stream (compressed using the video encoding format) and possibly audio and other media streams. The job of a video packaging format is to combine these different types of media data into a single file and define how to store and arrange them so that a player or decoder can correctly parse and play back the data.
For example, a video file can use the MP4 encapsulation format, which contains an H.264-encoded video stream and an AAC-encoded audio stream. In this case, MP4 defines how to put these two media streams together and store their associated metadata so that the player can recognize and play the video file. Therefore, the video encoding format and the video packaging format together determine how digital video is stored and played.
Summarize
Video encapsulation format, also called a container, is to put the encoded and compressed video stream, audio stream and subtitles into a file in a certain way to facilitate the playback software. Video coding format can be understood as a name for different compression algorithms and methods. It is a compression algorithm used to compress video data.
Introduction to webm format
WebM is an open multimedia packaging format commonly used with some specific video and audio encoding formats. The most commonly used video encoding formats for WebM are VP8 and VP9, while audio encoding formats usually use Vorbis or Opus. The following are commonly used video and audio encoding formats for WebM:
webm video encoding format
VP8: VP8 is an open, efficient video encoding format widely used in WebM packaging. It offers decent video quality and compression efficiency, and supports a wide range of devices and browsers.
VP9: VP9 is the successor to VP8 and offers better video quality and higher compression efficiency. It is commonly used for HD and Ultra HD videos.
webm audio encoding format
Vorbis: Vorbis is an open audio encoding format commonly used with VP8 or VP9 video for WebM. It provides high-quality audio encoding and is widely used in open environments.
Opus: Opus is a versatile audio encoding format that can be used in a variety of applications, including real-time communications, music streaming, and more. It is increasingly used in the WebM packaging format because it performs well at low bitrates.
webm summary
The flexibility of the WebM format makes it suitable for online video streaming, online conferencing, HTML5 video playback, and other multimedia applications. Especially in the web environment, the WebM format is widely used because it is an open standard and can be played in most modern browsers. But be aware that some older versions of browsers may not support WebM, so you need to consider the browser support of your target audience when choosing the encoding format and encapsulation format.
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