What does video encoding mean?

Video encoding means the process of converting the original video format file into another video format file through compression technology; the purpose of video encoding is compatibility and efficiency of applications and hardware, and the encoding process will Transform the video and audio data in the file and then do the compression according to the selected specifications of the encoding standard.

The operating environment of this tutorial: Windows 10 system, DELL G3 computer.

What does video encoding mean

The so-called video encoding method refers to the method of converting the original video format file into another video format file through compression technology.

Video encoding is the process of converting digital video files from one standard digital video format to another. The purpose of this is compatibility and efficiency for the desired set of applications and hardware, such as for DVD/Blu-ray, mobile, video streaming or general video editing. The encoding process transforms the video and audio data in the file and then does the compression according to the selected specifications of the encoding standard.

The encoding and decoding format is the way in which the data is encoded and compressed to facilitate network transmission and reduce the need for bandwidth; the file format is to compress the content according to a specific encoding format and then encapsulate it in the format specified by the file. As a result, that is, the concept of a container, file playback is parsed according to the storage method of the container data, and the encoded data is extracted and then decoded and handed over to the playback device for playback.

The original video is very large after being collected through the camera. If it is to be transmitted on the Internet, it must be compressed, so there are coding and decoding standards. The original video file has different formats after being compressed. For example, what is compressed by h.264 is the .264 format, and the others are the same. The videos (AVI, MPEG, MOV) we watch such as movies contain not only images but also sounds. They are the result of encapsulating video and audio.

The so-called video encoding method refers to the method of converting a file in a certain video format into another video format file through a specific compression technology. The most important coding and decoding standards in video streaming transmission include ITU's H.261, H.263, H.264, M-JPEG of the Moving Picture Expert Group and the MPEG series standards of the International Organization for Standardization Moving Picture Expert Group. In addition, Also widely used on the Internet are Real-Networks' RealVideo, Microsoft's WMV, and Apple's QuickTime.

The so-called video format is a container, which is a standard for mixing and encapsulating the multimedia content (video, audio, subtitles, chapter information, etc.) generated by the encoder. Containers make it easy to play different multimedia contents synchronously, and another function of the container is to provide indexing for multimedia contents. That is to say, if there is no container, you can only watch a movie from the beginning to the end, and you cannot drag the progress. (Of course, in this case, some player sessions take a long time to temporarily create indexes), and if you don't manually load the audio yourself, there will be no sound.

Video encoding formats include h.263, h.264, mpeg-4, etc. Video file formats include AVI, MPEG, MOV and other formats. h.263, h.264, mpeg-4 is 3 different codecs.

Extended information

ITU-T and ISO/IEC are the two major organizations that formulate video coding standards. ITU-T Standards include H.261, H.263, and H.264. The two organizations have also jointly developed some standards. The H.262 standard is equivalent to the MPEG-2 video coding standard, and the latest H.264 standard has been incorporated into MPEG-2. Part 10 of 4.

Video compression technology is the prerequisite for computer processing of videos. After the video signal is digitized, the data bandwidth is very high, usually above 20MB/second, so it is difficult for the computer to save and process it. Using compression technology, the data bandwidth is usually reduced to 1-10MB/second, so that the video signal can be saved in the computer and processed accordingly.

Video image data has extremely strong correlation, which means there is a lot of redundant information. The redundant information can be divided into air domain redundant information and time domain redundant information. Compression technology is to remove redundant information from data. Compression technology includes intra-frame image data compression technology, inter-frame image data compression technology and entropy coding compression technology.

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