{"id":1925,"date":"2021-12-03T16:01:14","date_gmt":"2021-12-03T15:01:14","guid":{"rendered":"https:\/\/www.blastream.com\/?p=1925"},"modified":"2022-02-07T16:27:45","modified_gmt":"2022-02-07T15:27:45","slug":"saturation-de-la-bande-passante-lors-dune-visioconference","status":"publish","type":"post","link":"https:\/\/www.blastream.com\/fr\/saturation-de-la-bande-passante-lors-dune-visioconference\/","title":{"rendered":"Saturation de la bande passante lors d&rsquo;une visioconf\u00e9rence"},"content":{"rendered":"<h3><\/h3>\n<h3><span id=\"p50\">Lors d\u2019une visioconf\u00e9rence \u201cclassique\u201d, chaque participant envoie un flux vid\u00e9o et audio \u00e0 chacun des autres participants selon ce mod\u00e8le :<\/span><\/h3>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"wp-image-1891 aligncenter lazyload\" data-src=\"https:\/\/www.blastream.com\/wp-content\/uploads\/2021\/05\/0_jFlpccC477uREZ91-300x169.png\" alt=\"\" width=\"451\" height=\"254\" data-srcset=\"https:\/\/www.blastream.com\/wp-content\/uploads\/2021\/05\/0_jFlpccC477uREZ91-300x169.png 300w, https:\/\/www.blastream.com\/wp-content\/uploads\/2021\/05\/0_jFlpccC477uREZ91-1024x576.png 1024w, https:\/\/www.blastream.com\/wp-content\/uploads\/2021\/05\/0_jFlpccC477uREZ91-768x432.png 768w, https:\/\/www.blastream.com\/wp-content\/uploads\/2021\/05\/0_jFlpccC477uREZ91.png 1280w\" data-sizes=\"(max-width: 451px) 100vw, 451px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 451px; --smush-placeholder-aspect-ratio: 451\/254;\" \/><\/p>\n<blockquote><p><span id=\"p49\">Lorsque le nombre de participants est limit\u00e9\u00a0<span id=\"p48\">(g\u00e9n\u00e9ralement jusqu\u2019\u00e0 4 environ)<\/span>, la qualit\u00e9 de l\u2019appel est bonne ;<\/span><span id=\"p8\">\u00a0cependant, si la liste des participants s\u2019allonge, la bande passante est de plus en plus satur\u00e9e et la qualit\u00e9 de la communication se d\u00e9grade.<\/span><span id=\"p9\">\u00a0Cette \u201cbande passante\u201d\u00a0<span id=\"p5\">(BP)<\/span>\u00a0repr\u00e9sente la quantit\u00e9 d\u2019informations pouvant \u00eatre transmises simultan\u00e9ment sur le r\u00e9seau.<\/span><span id=\"p10\">\u00a0Plus un appareil dispose d\u2019une connexion puissante, plus sa BP est importante.<\/span><\/p><\/blockquote>\n<p><span id=\"p11\">Dans une visioconf\u00e9rence classique, la bande passante de chaque participant se divise en fonction du nombre de flux qu\u2019il envoie et re\u00e7oit.<\/span><span id=\"p12\">\u00a0Par exemple, lors d\u2019un \u00e9change entre 4 personnes, chaque BP\u00a0<span id=\"26\">sera divis\u00e9e<\/span>\u00a0par 3 pour envoyer 3\u00a0<span id=\"27\">flux:<\/span><\/span><\/p>\n<p><img decoding=\"async\" class=\"wp-image-1930 aligncenter lazyload\" data-src=\"https:\/\/www.blastream.com\/wp-content\/uploads\/2022\/02\/0_SoM1U_bKQENSOojo-300x169.png\" alt=\"\" width=\"451\" height=\"254\" data-srcset=\"https:\/\/www.blastream.com\/wp-content\/uploads\/2022\/02\/0_SoM1U_bKQENSOojo-300x169.png 300w, https:\/\/www.blastream.com\/wp-content\/uploads\/2022\/02\/0_SoM1U_bKQENSOojo-1024x576.png 1024w, https:\/\/www.blastream.com\/wp-content\/uploads\/2022\/02\/0_SoM1U_bKQENSOojo-768x432.png 768w, https:\/\/www.blastream.com\/wp-content\/uploads\/2022\/02\/0_SoM1U_bKQENSOojo.png 1280w\" data-sizes=\"(max-width: 451px) 100vw, 451px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 451px; --smush-placeholder-aspect-ratio: 451\/254;\" \/><\/p>\n<p><span id=\"p15\">Ainsi, il suffit que l\u2019un des participants ait une mauvaise connexion\u00a0<span id=\"p51\">(<\/span><span id=\"p52\">Ex :<\/span><span id=\"p14\">\u00a0un t\u00e9l\u00e9phone en 3G)<\/span>\u00a0ou que beaucoup de monde soit connect\u00e9 pour d\u00e9grader la qualit\u00e9 de la\u00a0<span id=\"31\">visioconf\u00e9rence<\/span>\u00a0jusqu\u2019\u00e0 la rendre inutilisable.<\/span><\/p>\n<p><span id=\"p17\">Un probl\u00e8me peut \u00e9galement survenir lors de la r\u00e9ception des flux.<\/span><span id=\"p18\">\u00a0En effet, la capacit\u00e9 maximale de la bande passante limite la quantit\u00e9 d\u2019information que les participants peuvent recevoir.<\/span><span id=\"p19\">\u00a0Comme sur le\u00a0sch\u00e9ma, ci-contre, si la BP d\u2019un intervenant est de 1,2 Mb\/s et que l\u2019addition des flux qu\u2019il re\u00e7oit d\u00e9passe ces 1,2 Mb\/s\u00a0<span id=\"p16\">(ici 1,2 + 0,7 + 0,9 = 2,8 Mb\/s)<\/span>, alors l\u2019image sera \u201c<span id=\"33\" class=\"s-rg-t\">pixelis\u00e9e<\/span>\u201d et l\u2019audio sera de mauvaise qualit\u00e9, rendant la communication impossible.<\/span><\/p>\n<p><img decoding=\"async\" class=\"wp-image-1927 aligncenter lazyload\" data-src=\"https:\/\/www.blastream.com\/wp-content\/uploads\/2022\/02\/0_QmWizB_31Tfhj6kq-300x169.png\" alt=\"\" width=\"451\" height=\"254\" data-srcset=\"https:\/\/www.blastream.com\/wp-content\/uploads\/2022\/02\/0_QmWizB_31Tfhj6kq-300x169.png 300w, https:\/\/www.blastream.com\/wp-content\/uploads\/2022\/02\/0_QmWizB_31Tfhj6kq-1024x576.png 1024w, https:\/\/www.blastream.com\/wp-content\/uploads\/2022\/02\/0_QmWizB_31Tfhj6kq-768x432.png 768w, https:\/\/www.blastream.com\/wp-content\/uploads\/2022\/02\/0_QmWizB_31Tfhj6kq.png 1280w\" data-sizes=\"(max-width: 451px) 100vw, 451px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 451px; --smush-placeholder-aspect-ratio: 451\/254;\" \/><\/p>\n<p><span id=\"p20\">Pour faire face \u00e0 cette probl\u00e9matique,\u00a0<span id=\"35\" class=\"s-rg-t\">Blastream<\/span>\u00a0passe par un serveur qui centralise les flux pour obtenir un unique flux d\u2019\u00e9mission et de r\u00e9ception pour chaque\u00a0intervenant :<\/span><\/p>\n<p><img decoding=\"async\" class=\"wp-image-1934 aligncenter lazyload\" data-src=\"https:\/\/www.blastream.com\/wp-content\/uploads\/2022\/02\/0_EJniO6KX5jo8NHcB-300x169.png\" alt=\"\" width=\"449\" height=\"253\" data-srcset=\"https:\/\/www.blastream.com\/wp-content\/uploads\/2022\/02\/0_EJniO6KX5jo8NHcB-300x169.png 300w, https:\/\/www.blastream.com\/wp-content\/uploads\/2022\/02\/0_EJniO6KX5jo8NHcB-1024x576.png 1024w, https:\/\/www.blastream.com\/wp-content\/uploads\/2022\/02\/0_EJniO6KX5jo8NHcB-768x432.png 768w, https:\/\/www.blastream.com\/wp-content\/uploads\/2022\/02\/0_EJniO6KX5jo8NHcB.png 1280w\" data-sizes=\"(max-width: 449px) 100vw, 449px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 449px; --smush-placeholder-aspect-ratio: 449\/253;\" \/><\/p>\n<p><span id=\"p53\">De cette mani\u00e8re, la bande passante n\u2019est pas divis\u00e9e et la qualit\u00e9 maximale est pr\u00e9serv\u00e9e :<\/span><\/p>\n<p><img decoding=\"async\" class=\"wp-image-1932 aligncenter lazyload\" data-src=\"https:\/\/www.blastream.com\/wp-content\/uploads\/2022\/02\/0_xAIond8lsuhyD-sv-300x169.png\" alt=\"\" width=\"499\" height=\"281\" data-srcset=\"https:\/\/www.blastream.com\/wp-content\/uploads\/2022\/02\/0_xAIond8lsuhyD-sv-300x169.png 300w, https:\/\/www.blastream.com\/wp-content\/uploads\/2022\/02\/0_xAIond8lsuhyD-sv-1024x576.png 1024w, https:\/\/www.blastream.com\/wp-content\/uploads\/2022\/02\/0_xAIond8lsuhyD-sv-768x432.png 768w, https:\/\/www.blastream.com\/wp-content\/uploads\/2022\/02\/0_xAIond8lsuhyD-sv.png 1280w\" data-sizes=\"(max-width: 499px) 100vw, 499px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 499px; --smush-placeholder-aspect-ratio: 499\/281;\" \/><\/p>\n<p><span id=\"p23\">De plus, la technologie\u00a0<span id=\"40\" class=\"s-rg-t\">Blastream<\/span>\u00a0est dot\u00e9e d\u2019un\u00a0<span id=\"41\" class=\"s-rg-t\">autobitrate<\/span>\u00a0qui ajuste automatiquement la qualit\u00e9 du flux montant et descendant\u00a0<span id=\"p22\">(envoy\u00e9\/re\u00e7u)<\/span>.<\/span><span id=\"p24\">\u00a0Ceci permet de garantir la stabilit\u00e9 et la fluidit\u00e9 de la conf\u00e9rence, m\u00eame lorsqu\u2019un participant a une connexion variable, par exemple un smartphone connect\u00e9 en 3G.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Lors d\u2019une visioconf\u00e9rence \u201cclassique\u201d, chaque participant envoie un flux vid\u00e9o et audio \u00e0 chacun des autres participants selon ce mod\u00e8le : &nbsp; Lorsque le nombre de participants est limit\u00e9\u00a0(g\u00e9n\u00e9ralement jusqu\u2019\u00e0 4 environ), la qualit\u00e9 de l\u2019appel est bonne ;\u00a0cependant, si la liste des participants s\u2019allonge, la bande passante est de plus en plus satur\u00e9e et [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2004,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[7],"tags":[],"class_list":["post-1925","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologie"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"Lors d\u2019une visioconf\u00e9rence \u201cclassique\u201d, chaque participant envoie un flux vid\u00e9o et audio \u00e0 chacun des autres participants selon ce mod\u00e8le : Lorsque le nombre de participants est limit\u00e9 (g\u00e9n\u00e9ralement jusqu\u2019\u00e0 4 environ), la qualit\u00e9 de 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