{"id":2590,"date":"2020-11-24T22:11:08","date_gmt":"2020-11-24T22:11:08","guid":{"rendered":"http:\/\/mp4gain.com\/mp4gain\/?p=2590"},"modified":"2020-11-24T22:11:08","modified_gmt":"2020-11-24T22:11:08","slug":"lossy-compression-compress-audio-and-video","status":"publish","type":"post","link":"https:\/\/mp4gain.com\/mp4gain\/lossy-compression-compress-audio-and-video\/","title":{"rendered":"Lossy compression: Compress audio and video"},"content":{"rendered":"<p><strong>Lossy compression: Compress audio and video<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/www.101computing.net\/wp\/wp-content\/uploads\/lossless-compression-lego-tower-4.png\" alt=\"Lossy cmpression\" width=\"278\" height=\"243\" \/><\/p>\n<p>High-quality digitized audio requires a large amount of disk space. Attempts to reduce file size using standard file cabinets do not yield significant gains due to the specificity of the audio data. However, it is possible to achieve a fairly significant level of compression of the audio information using special methods based on the analysis of the data structure and subsequent compression with some loss.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone\" src=\"https:\/\/cdn.kastatic.org\/ka-perseus-images\/cdaa3bfc074058fe11e9fd6dad9ae3f419359372.svg\" alt=\"Lossy Compression\" width=\"331\" height=\"187\" \/><\/p>\n<p>The real possibility of sound processing comparable in quality to existing analog examples did not appear until the late 1980s. In 1988, the International Organization for Standardization (ISO) formed the MPEG (Moving Image Experts Group) committee. , whose main task is to develop standards for the encoding of moving images, sound and their combination. During the ten years of its existence, the committee has developed a series of norms on this subject. As a result, summarizing the extensive research in this area, several specific formats were recommended for storing data, which are excellent in quality of results and data flow.<\/p>\n<p>Currently, the three most common video storage standards are MPEG-1, MPEG-2, and MPEG-4. Within the first two formats, there are also formats for storing audio information: Layer-1, Layer-2 and Layer-3. These three audio formats are defined for MPEG-1 and minor extensions are used in MPEG-2. The three formats are similar to each other, but use different levels of compromise between compression and complexity. Layer-1 is the simplest level, it does not require significant compression costs, but it also provides a negligible compression ratio. Layer-3 level: the most time consuming and provides the best compression. Recently, this format has gained immense popularity. It is often called MP3. This name is associated with the extension of the audio files stored in this format.<\/p>\n<p>Founded idea, in which all audio signal loss compression methods &#8211; ignore the subtle details of the original sound, which are outside of what the human ear perceives. Here several points can be highlighted.<\/p>\n<p>Noise level. Sound compression is based on a simple fact: if a person is near a loud siren, they are unlikely to hear the conversation of the people who are nearby. Also, this happens not because a person pays close attention to a loud sound, but to a greater extent because the human ear actually misses out sounds that are in the same frequency range as a louder sound. This effect is called masking, it changes with the difference in volume and frequency of the sound.<\/p>\n<p>The second point is the division of the audio frequency band into subbands, each of which is further processed separately. The encoding program extracts the loudest sounds in each band and uses this information to determine an acceptable noise level for that band. The best encoding programs also take into account the influence of adjacent bands. A very loud sound in one band can affect the masking effect and nearby bands.<\/p>\n<p>Another point of the codification is the use of a psychoacoustic model based on the peculiarities of the human perception of sound. Compression The use of this model is based on removing obviously inaudible frequencies with more careful preservation of sounds that are clearly distinguishable by the human ear. Unfortunately, there can be no exact mathematical formulas here. The human perception of sound is a complex process, not fully understood, so the choice of compression methods is based on analyzing listening and comparing compressed sounds differently by teams of experts. But here there are practically limitless possibilities in the field of improving psychoacoustic models. Most of the existing algorithms to encode the human voice are based on the high predictability of said signal; Universal MPEG compression algorithms have tried to apply this technique with variable success.<\/p>\n<p>Another compression technique is the use of so-called joint stereo. It is known that the human hearing aid can only determine the direction of the mid frequencies, the high and low sound, so to speak, separately from the source. This means that these background frequencies can be encoded into a mono signal. In addition to all this, compression uses the difference in the complexity of the flows in the channels. For example, if there is total silence on the right channel for some time, this &#8220;reserved&#8221; place is used to improve the quality of the left channel.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Lossy compression: Compress audio and video High-quality digitized audio requires a large amount of disk space. Attempts to reduce file size using standard file cabinets do not yield significant gains due to the specificity of the audio data. However, it is possible to achieve a fairly significant level of compression of the audio information using &hellip; <a href=\"https:\/\/mp4gain.com\/mp4gain\/lossy-compression-compress-audio-and-video\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Lossy compression: Compress audio and video&#8221;<\/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":[53608,53616,53617,53625,39387,53610,33211,53609,33270,53642,53640,53641,53618,33180,53627,33233,53626,33232,53630,53629,53628,33231,27796,53633,53612,53614,33254,53624,33249,33258,53615,53632,53611,53613,53631,33260,53636,33297,33300,53635,33301,33299,33298,33279,33221,33220,33350,33348,53639,53619,53620,53621,53622,53643,53637,53623,39410,45945,53634,53638],"class_list":["post-2590","post","type-post","status-publish","format-standard","hentry","category-audio-video","tag-about-lossy-compression","tag-difference-between-lossy-compression-and-lossless","tag-differences-between-lossy-compression","tag-lossless-compression-quizlet","tag-lossless-vs-lossy-image-compression","tag-lossy-compression","tag-lossy-compression-choose-three","tag-lossy-compression-after-mac-generation","tag-lossy-compression-also-known-as","tag-lossy-compression-and-file-format","tag-lossy-compression-and-iterative-reconstruction-for-encrypted-image","tag-lossy-compression-and-its-types","tag-lossy-compression-by","tag-lossy-compression-definition","tag-lossy-compression-for-audio","tag-lossy-compression-for-images","tag-lossy-compression-for-music","tag-lossy-compression-for-photographs-and-video","tag-lossy-compression-for-photography","tag-lossy-compression-for-photography-and-video","tag-lossy-compression-for-text","tag-lossy-compression-for-video","tag-lossy-compression-format","tag-lossy-compression-in","tag-lossy-compression-in-audio","tag-lossy-compression-in-computer-graphics","tag-lossy-compression-in-digital-image-processing","tag-lossy-compression-in-digital-image-processing-ppt","tag-lossy-compression-in-hindi","tag-lossy-compression-in-image-processing","tag-lossy-compression-in-images","tag-lossy-compression-in-jpeg","tag-lossy-compression-in-multimedia","tag-lossy-compression-in-photoshop","tag-lossy-compression-in-text","tag-lossy-compression-jpeg","tag-lossy-compression-of-computer","tag-lossy-compression-of-images","tag-lossy-compression-of-medical-images","tag-lossy-compression-of-text","tag-lossy-compression-on-a-computer","tag-lossy-compression-on-audio-files","tag-lossy-compression-on-text","tag-lossy-compression-quizlet","tag-lossy-compression-tool","tag-lossy-compression-uses","tag-lossy-compression-vs","tag-lossy-compression-vs-lossless-compression","tag-lossy-compression-vs-non-lossy-compression","tag-lossy-compression-with-distortion-constrained-optimization","tag-lossy-compression-with-examples","tag-lossy-compression-with-mp3","tag-lossy-compression-with-png","tag-lossy-compression-with-text","tag-lossy-of-compression","tag-lossy-versus-lossless-compression","tag-lossy-vs-lossless-compression-examples","tag-lossy-vs-lossless-compression-techniques","tag-near-lossy-compression","tag-opposite-of-lossy-compression"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Lossy compression: Compress audio and video - 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\/lossy-compression-compress-audio-and-video\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Lossy compression: Compress audio and video - mp4gain.com\" \/>\n<meta property=\"og:description\" content=\"Lossy compression: Compress audio and video High-quality digitized audio requires a large amount of disk space. 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