{"id":3855,"date":"2021-07-13T15:18:16","date_gmt":"2021-07-13T15:18:16","guid":{"rendered":"http:\/\/mp4gain.com\/mp4gain\/?p=3855"},"modified":"2021-07-13T15:18:16","modified_gmt":"2021-07-13T15:18:16","slug":"video-basics-and-compression-part-3","status":"publish","type":"post","link":"https:\/\/mp4gain.com\/mp4gain\/video-basics-and-compression-part-3\/","title":{"rendered":"Video Basics and Compression Part 3"},"content":{"rendered":"

Video Basics and Compression Part 3<\/strong><\/p>\n

\"Video<\/p>\n

Drawing method<\/p>\n

\"video<\/p>\n

The drawing method is a method of scanning video signals.
\nThere are “progressives” and “interlaced”.<\/p>\n

Progressive performs one scan drawing at a time. Interlacing, on the other hand, is a gradual and clear drawing method.<\/p>\n

Main video compression methods and functions
\nFrom here, I will explain the following three main video compression methods.<\/p>\n

MPEG
\nH.264
\nMotion JPEG (MJPEG)
\nMPEG
\nMPEG is read as “Mpeg”. It is one of the standards for compressing video and audio.<\/p>\n

MPEG Features
\nHigh degree of freedom in encoder control.
\nNot suitable for taking a frame clearly.
\nOriginally, it was an abbreviation taken by the acronym for “Moving Picture Experts Group”, an international standardization organization for video encoding, but it has come to be used as the name of the encoding method (compression method) standardized by that organization. . .<\/p>\n

MPEG processes the differences frame by frame block by block.<\/p>\n

The “block” here refers to a group of adjacent pixels.<\/p>\n

In video compression, groups of adjacent pixels in a square range are generally treated as a group, and this is called a macroblock. This block is compared to the block at the same position in the next frame, and only the difference is sent as data.<\/p>\n

Quoted from Wikipedia “Data compression” (last consultation: 05\/21\/2020)<\/p>\n

A frame is a “one-by-one still image”.<\/p>\n

If multiple still images (frames) continue, “shifting portions” and “unchanging portions” will appear.
\nThe part that does not change is the “duplicate information”, so it can be compressed.<\/p>\n

Thus, in MPEG, the part that changes and the part that does not change for each frame are processed in block units.<\/p>\n

H.264
\nH.264 is read as “H.dot Nirokuyon”. This is also the standard method for video compression.<\/p>\n

H.264 Features
\nHigh compression rate. (More than twice that of MPEG-2)
\nThe bit rate is low.
\nIt is sometimes called “MPEG-4 AVC” because it is standardized as “MPEG-4 Part 10 Advanced Video Coding” in the MPEG-4 standard. (MPEG-4 AVC is read as “Mpeg for AVC”. AVC is an abbreviation for “Advanced Video Coding”).<\/p>\n

Motion JPEG (MJPEG)
\nMotion JPEG is read as “Motion Jepeg”. Also written as “MJPEG”.
\nAs the name suggests, the still images (frames) that make up a movie are “JPEG images.” (To be exact, the frame is compressed in JPEG format.)<\/p>\n

These JPEG images are made continuous like a flip book.
\nSo to speak, “a set of continuous JPEG images” is the video data.<\/p>\n

Motion JPEG (MJPEG) features
\nIt is beautiful even if you look at it in a painting.
\nThe video capacity is great.
\nThe compression ratio is not as high as MPEG.
\nHowever, due to the characteristics of MPEG processing in “block units”, there is a drawback that “block noise” occurs when the bit rate is low.
\nAlso, in cases where there is a lot of movement (the change is large for each frame), the image tends to be rough, but in the case of Motion JPEG, it can be handled even in cases where there is a lot of movement. .<\/p>\n

In addition, Motion JPEG has a powerful advantage that MPEG and H.264 do not have, ie “you can extract a frame clearly”.<\/p>\n","protected":false},"excerpt":{"rendered":"

Video Basics and Compression Part 3 Drawing method The drawing method is a method of scanning video signals. There are “progressives” and “interlaced”. Progressive performs one scan drawing at a time. Interlacing, on the other hand, is a gradual and clear drawing method. Main video compression methods and functions From here, I will explain the … Continue reading “Video Basics and Compression Part 3”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[62618,62612,50958,50955,50964,50959,50976,62613,50962,50968,50966,62615,50963,50960,62617,50975,62619,50970,50972,50971,62616,50980,50982,50978,50985,48573,50983],"class_list":["post-3855","post","type-post","status-publish","format-standard","hentry","category-audio-video","tag-compression-video-hd","tag-do-video-compression-in-android","tag-does-video-compression","tag-does-video-compression-affect-quality","tag-hd-video-compression","tag-how-does-video-compression-work","tag-how-is-video-compression-accomplished","tag-how-long-does-video-compression-take","tag-how-to-do-video-compression","tag-how-video-compression-works","tag-lossless-hd-video-compression","tag-video-compression-hd-android","tag-what-does-video-compression-do","tag-what-does-video-compression-mean","tag-what-is-video-compression-in-multimedia","tag-what-is-video-compression-techniques","tag-what-video-compression","tag-what-video-compression-does-netflix-use","tag-what-video-compression-does-youtube-use","tag-what-video-compression-does-zoom-use","tag-what-video-compression-should-i-use","tag-where-is-video-compression","tag-which-video-compression","tag-which-video-compression-is-best","tag-why-does-video-compression-work","tag-why-video-compression","tag-why-video-compression-is-required"],"yoast_head":"\nVideo Basics and Compression Part 3 - mp4gain.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mp4gain.com\/mp4gain\/video-basics-and-compression-part-3\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Video Basics and Compression Part 3 - mp4gain.com\" \/>\n<meta property=\"og:description\" content=\"Video Basics and Compression Part 3 Drawing method The drawing method is a method of scanning video signals. There are “progressives” and “interlaced”. Progressive performs one scan drawing at a time. Interlacing, on the other hand, is a gradual and clear drawing method. Main video compression methods and functions From here, I will explain the … Continue reading "Video Basics and Compression Part 3"\" \/>\n<meta property=\"og:url\" content=\"https:\/\/mp4gain.com\/mp4gain\/video-basics-and-compression-part-3\/\" \/>\n<meta property=\"og:site_name\" content=\"mp4gain.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/mp4gain\" \/>\n<meta property=\"article:published_time\" content=\"2021-07-13T15:18:16+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/lh3.googleusercontent.com\/proxy\/ZVHpXuJoN-TLbwYU99Zdw7x3QDU4GYSIQWOyALAAly_518mR0EyXIVR-ST0t9s6dk-EzFCOAxcJD0EPIrSh2cQIurIAWkvrLkzrFHdscvqAqkpKSACI81UofL7cH7ZthKoqhhUs\" \/>\n<meta name=\"author\" content=\"R. 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