{"id":371,"date":"2019-09-02T18:19:38","date_gmt":"2019-09-02T18:19:38","guid":{"rendered":"http:\/\/mp4gain.com\/mp4gain\/?p=371"},"modified":"2019-09-02T18:19:38","modified_gmt":"2019-09-02T18:19:38","slug":"audio-quality-bitrate-in-mp3-files","status":"publish","type":"post","link":"https:\/\/mp4gain.com\/mp4gain\/audio-quality-bitrate-in-mp3-files\/","title":{"rendered":"Audio quality: Bitrate in MP3 files"},"content":{"rendered":"<p>In many cases, the term Bitrate is used, which is the bit rate per second that a multimedia file (Audio or Video) has. Currently the MP3 music format is one of the most widespread (Although there are currently other more current formats such as OGG Vorbis, AAC, Flac, Monkey Audio, &#8230;) however the audio quality is variable, this is due to the characteristics with which the MP3 in question has been compressed, including:<\/p>\n<p>Mode: It can be of two types mainly:<\/p>\n<p><strong>Mono<\/strong>: With a single channel (The right and left channel go together, not separated which gives worse audio quality).<\/p>\n<p><strong>Stereo<\/strong>: Two channels (Right and Left, improve audio quality).<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_81 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mp4gain.com\/mp4gain\/audio-quality-bitrate-in-mp3-files\/#Sampling_frequency\" >Sampling frequency:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mp4gain.com\/mp4gain\/audio-quality-bitrate-in-mp3-files\/#Some_of_the_most_common_Bitrates_are\" >Some of the most common Bitrates are:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mp4gain.com\/mp4gain\/audio-quality-bitrate-in-mp3-files\/#Coding_method_It_can_be_of_two_types\" >Coding method: It can be of two types:<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Sampling_frequency\"><\/span>\nSampling frequency:<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Audio CDs use 44,100 Hz (22,050 Hz per channel), although there are higher frequencies such as 48,000 Hz used in DVDs and lower, the higher the frequency, the higher the quality.<br \/>\nBits: Audio CDs have 16 Bits (Although MP3 can be compressed at a lower quality such as 8 Bits).<br \/>\nBitrate (Bit Rate per second): Audio CDs have about 1,400 Kbps (44100 Hz * 16 Bits * 2 channels), meaning that an Audio CD would have a bitrate of 1,400 Kbps (In MP3 format the maximum Bitrate is 320 Kbps, however, it is assumed that an MP3 with a 128 Kbps Bitrate has a quality similar to CD, although in many cases to achieve a quality similar to CD it is necessary to use a Bitrate of 192 Kbps, and to obtain CD quality it is necessary use 256 Kbps or 320 Kbps).<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Some_of_the_most_common_Bitrates_are\"><\/span>Some of the most common Bitrates are:<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>8 Kbps Mono: Telephone Sound.<br \/>\n16 Kbps Mono: Better quality than shortwave.<br \/>\n32 Kbps Mono: Better quality than AM.<br \/>\n64 Kbps Stereo: Better quality than FM.<br \/>\n112 &#8211; 128 Kbps: Quality close to CD.<br \/>\n160 Kbps: Quality closer to CD.<br \/>\n192 Kbps: Virtually CD quality.<br \/>\n256 Kbps: Quality CD practically undisputed from an original CD.<br \/>\n320 Kbps: CD quality.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Coding_method_It_can_be_of_two_types\"><\/span>Coding method: It can be of two types:<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>VBR (Variable Bit Rate, Bit Rate Variable): Encodes the file in MP3 with a variable Bitrate.<br \/>\nCBR (Constant Bit Rate, Constant Bit Rate): Encodes the MP3 file with a fixed Bitrate.<\/p>\n<p>In addition, another factor that influences the encoding of the MP3 file is the CODEC (Encoder-Decoder) used, one of the most common and the best result is LAME (Lame Ain\u2019t an MP3 Encoder) which is also free.<\/p>\n<p><a href=\"http:\/\/mp4gain.com\/mp4gain\/wp-content\/uploads\/2019\/09\/156fc92a92a1ace1743888317048.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-372\" src=\"http:\/\/mp4gain.com\/mp4gain\/wp-content\/uploads\/2019\/09\/156fc92a92a1ace1743888317048-300x300.gif\" alt=\"\" width=\"300\" height=\"300\" srcset=\"https:\/\/mp4gain.com\/mp4gain\/wp-content\/uploads\/2019\/09\/156fc92a92a1ace1743888317048-300x300.gif 300w, https:\/\/mp4gain.com\/mp4gain\/wp-content\/uploads\/2019\/09\/156fc92a92a1ace1743888317048-150x150.gif 150w\" sizes=\"auto, (max-width: 300px) 85vw, 300px\" \/><\/a><\/p>\n<p>One point to keep in mind is that if we recompress an MP3 file that originally has a 128 Kbps bitrate and convert them to 192 Kbps for example, audio quality is not really gained because the MP3 format has some quality loss (MP3 is a loss algorithm, also called lossy). which has occurred when converting the original file (Ex: CD Audio or a 320 Kbps MP3 to a 128 Kbps MP3) so this recompression does not make much sense since we will not gain in audio quality (As they say where there is no one can not get) and the only thing we will achieve in any case is to increase the initial size of the file.<\/p>\n<p>The opposite case (Recompress a 320 Kbps MP3 file for example at 192 Kbps) if it makes some sense because in this case although we lose some audio quality we reduce the weight (Kilobytes or Megabytes) of each MP3 file somewhat.<\/p>\n<p><a href=\"http:\/\/mp4gain.com\/mp4gain\/wp-content\/uploads\/2019\/09\/32.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-373\" src=\"http:\/\/mp4gain.com\/mp4gain\/wp-content\/uploads\/2019\/09\/32.jpg\" alt=\"\" width=\"259\" height=\"194\" \/><\/a><br \/>\nIn conclusion, it can be said that if we need to encode \/ compress an MP3 file with good quality, the \u201cideal\u201d would be to do so:<\/p>\n<p>To be able to start from an Audio CD, although an MP3 at 320 or 256 Kbps could also be valid for a recompression of the file.<br \/>\nIn stereo mode (With two channels, right and left).<br \/>\nWith at least 44100 Khz sampling rate and 16 Bits.<br \/>\nWith a minimum bitrate of 192 Kbps or at most 256 Kbps (Using 320 Kbps would give higher quality but also increase the file size considerably).<br \/>\nUse the LAME Codec (Lame Ain\u2019t an MP3 Encoder).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In many cases, the term Bitrate is used, which is the bit rate per second that a multimedia file (Audio or Video) has. Currently the MP3 music format is one of the most widespread (Although there are currently other more current formats such as OGG Vorbis, AAC, Flac, Monkey Audio, &#8230;) however the audio quality &hellip; <a href=\"https:\/\/mp4gain.com\/mp4gain\/audio-quality-bitrate-in-mp3-files\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Audio quality: Bitrate in MP3 files&#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":[487,257,485,482,486,4249,6565,488],"tags":[1964,6643,4470,6073,6645,5851,194,42,5331,6233,6312,556,6169,5536,678,5289,6187,5266,6299,6644],"class_list":["post-371","post","type-post","status-publish","format-standard","hentry","category-3gp-volume-normalizer","category-audio-normalizer","category-avi-normalizer-2","category-flac-normalizer-2","category-flv-volume-normalizer","category-mp3gain-2","category-mp3gain-online","category-mp4-2","tag-audio-normalization-software","tag-batch-increase-volume-mp3","tag-best-mp3-normalizer","tag-decrease-mp3-volume-online","tag-how-to-use-mp3gain","tag-increase-audio-volume-online","tag-mp3-gain","tag-mp3-normalizer","tag-mp3-normalizer-free","tag-mp3-volume-booster-software","tag-mp3-volume-changer","tag-mp3-volume-normalizer","tag-mp3-volume-normalizer-mac","tag-mp3-volume-normalizer-online","tag-mp3gain-alternative","tag-mp3gain-full-installer","tag-mp3gain-portable","tag-mp3gain-pro","tag-mp3gain-windows-10","tag-normalize-mp3-volume-audacity"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Audio quality: Bitrate in MP3 files - mp4gain.com<\/title>\n<meta name=\"description\" content=\"In many cases, the term Bitrate is used, which is the bit rate per second that a multimedia file (Audio or Video) has. Currently the MP3 music format is one of the most widespread (Although there are currently other more current formats such as OGG Vorbis, AAC, Flac, Monkey Audio, ...) however the audio quality is variable, this is due to the characteristics with which the MP3 in question has been compressed\" \/>\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\/audio-quality-bitrate-in-mp3-files\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Audio quality: Bitrate in MP3 files - mp4gain.com\" \/>\n<meta property=\"og:description\" content=\"In many cases, the term Bitrate is used, which is the bit rate per second that a multimedia file (Audio or Video) has. Currently the MP3 music format is one of the most widespread (Although there are currently other more current formats such as OGG Vorbis, AAC, Flac, Monkey Audio, ...) however the audio quality is variable, this is due to the characteristics with which the MP3 in question has been compressed\" \/>\n<meta property=\"og:url\" content=\"https:\/\/mp4gain.com\/mp4gain\/audio-quality-bitrate-in-mp3-files\/\" \/>\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=\"2019-09-02T18:19:38+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/mp4gain.com\/mp4gain\/wp-content\/uploads\/2019\/09\/156fc92a92a1ace1743888317048-300x300.gif\" \/>\n<meta name=\"author\" content=\"R. 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Currently the MP3 music format is one of the most widespread (Although there are currently other more current formats such as OGG Vorbis, AAC, Flac, Monkey Audio, ...) however the audio quality is variable, this is due to the characteristics with which the MP3 in question has been compressed\",\"breadcrumb\":{\"@id\":\"https:\/\/mp4gain.com\/mp4gain\/audio-quality-bitrate-in-mp3-files\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/mp4gain.com\/mp4gain\/audio-quality-bitrate-in-mp3-files\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/mp4gain.com\/mp4gain\/audio-quality-bitrate-in-mp3-files\/#primaryimage\",\"url\":\"https:\/\/mp4gain.com\/mp4gain\/wp-content\/uploads\/2019\/09\/156fc92a92a1ace1743888317048.gif\",\"contentUrl\":\"https:\/\/mp4gain.com\/mp4gain\/wp-content\/uploads\/2019\/09\/156fc92a92a1ace1743888317048.gif\",\"width\":500,\"height\":500},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/mp4gain.com\/mp4gain\/audio-quality-bitrate-in-mp3-files\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/mp4gain.com\/mp4gain\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Audio quality: Bitrate in MP3 files\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/mp4gain.com\/mp4gain\/#website\",\"url\":\"https:\/\/mp4gain.com\/mp4gain\/\",\"name\":\"mp4gain.com\",\"description\":\"Mp4 Gain Official Website\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/mp4gain.com\/mp4gain\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/mp4gain.com\/mp4gain\/#\/schema\/person\/36ffddda9988e565bd4a9013324ce2cc\",\"name\":\"R. 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Arias","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/8ca03263e87418cfde07c571c83fa172297ce230085e4f181b9e5f9af745d6be?s=96&d=blank&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/8ca03263e87418cfde07c571c83fa172297ce230085e4f181b9e5f9af745d6be?s=96&d=blank&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/8ca03263e87418cfde07c571c83fa172297ce230085e4f181b9e5f9af745d6be?s=96&d=blank&r=g","caption":"R. Arias"},"description":"R. Arias is the author of this article and has extensive experience for more than 30 years as a recording engineer and audio specialist, as well as more than 20 years of experience creating algorithms related to audio and video. 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