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html - Audio tag doesn't work in Firefox and Opera - Stack ...
https://stackoverflow.com/questions/13218097/audio-tag-doesnt-work-in-firefox-and-opera
Firefox 24.0 as of Halloween 2013 through firebug 1.12.4 from MP3 source <source src="media/SoundFile.mp3" type="audio/mpeg" /> [! Yellow Warning] Specified "type" attribute of "audio/mpeg" is not supported. Load of media resource media/SoundFile.mp3 failed. Originally I tried various codec entries and it really didn't like them.
HTTP "Content-Type" of "audio/mpeg" is not supported …
https://stackoverflow.com/questions/16760955/http-content-type-of-audio-mpeg-is-not-supported-issue-on-firefox
To avoid patent issues, support for MPEG 4, H.264, MP3 and AAC is not built directly into Firefox. Instead it relies on support from the OS or hardware. So using firefox, the support of some file formats like mp3 does not only depend on the browser version but also on the OS.
#24875 (MP3 not working in audio shortcode in Firefox ...
https://core.trac.wordpress.org/ticket/24875
[02:11:02.501] Specified "type" attribute of "audio/mpeg" is not supported. Load of media resource http://wptrunk.dev/wp-content/uploads/2013/07/13-Soul-Calibur-1.mp3 failed. @ http://wptrunk.dev/index.php/testing-audio/ According to a StackExchange discussion, Firefox should natively support MP3s in v21+. @
MP4 files won´t play | Firefox Support Forum | Mozilla …
https://support.mozilla.org/en-US/questions/1053509
Firefox 26 was the first version to support DirectShow for MPEG media on Windows XP, but only for audio (MP3). Based on what I see in the bug tracking system, there is no plan to support MPEG video on Windows XP because DirectShow is not fully featured and Microsoft didn't release a trusted codec and many codec downloads are malware or insecure …
Demo with Firefox: Specified “type” attribute of ...
https://github.com/videojs/videojs-contrib-hls/issues/1401
Hi, the demo page makes Firefox (v 59) throw this in console: Specified “type” attribute of “application/x-mpegURL” is not supported. Load of media resource ...
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