{"id":1571,"date":"2021-08-13T23:43:11","date_gmt":"2021-08-13T13:43:11","guid":{"rendered":"https:\/\/blog.hegars.com\/?p=1571"},"modified":"2021-08-13T23:49:40","modified_gmt":"2021-08-13T13:49:40","slug":"ffmpge-generate-quindar-tones","status":"publish","type":"post","link":"https:\/\/blog.hegars.com\/?p=1571","title":{"rendered":"FFMPEG Generate Quindar tones"},"content":{"rendered":"\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/Quindar_tones\">https:\/\/en.wikipedia.org\/wiki\/Quindar_tones<\/a><\/p>\n\n\n\n<p>intro tone<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ffmpeg -f lavfi -i \"sine=frequency=2525:duration=0.25:sample_rate=8000\" -ab 8k -ac 1 -codec:a pcm_mulaw intro.wav<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"https:\/\/blog.hegars.com\/wp-content\/uploads\/2021\/08\/intro.wav\"><\/audio><\/figure>\n\n\n\n<p>outro tone<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ffmpeg -f lavfi -i \"sine=frequency=2475:duration=0.25:sample_rate=8000\" -ab 8k -ac 1 -codec:a pcm_mulaw outro.wav<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"https:\/\/blog.hegars.com\/wp-content\/uploads\/2021\/08\/outro.wav\"><\/audio><\/figure>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>https:\/\/en.wikipedia.org\/wiki\/Quindar_tones intro tone outro tone<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-container-style":"default","site-container-layout":"default","site-sidebar-layout":"default","disable-article-header":"default","disable-site-header":"default","disable-site-footer":"default","disable-content-area-spacing":"default","footnotes":""},"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/posts\/1571"}],"collection":[{"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1571"}],"version-history":[{"count":5,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/posts\/1571\/revisions"}],"predecessor-version":[{"id":1581,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=\/wp\/v2\/posts\/1571\/revisions\/1581"}],"wp:attachment":[{"href":"https:\/\/blog.hegars.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1571"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1571"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.hegars.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1571"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}