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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
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 …
#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+. @
MP4s unable to play (Windows Home Edition) | Firefox ...
https://support.mozilla.org/en-US/questions/1294437
HTTP "Content-Type" of "video/mp4" is not supported [...] Cannot play media. No decoders for requested formats: video/mp4 or Specified "type" attribute of "video/mp4" is not supported etc. Same result when disabling all addons. …
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 …
Specified "type" attribute of "video/mp4" is not supported
https://stackoverflow.com/questions/14536298/specified-type-attribute-of-video-mp4-is-not-supported
MP4 type isn't supported on Firefox! It's only supported in Safari 3.0+, Google Chrome 5.0+ and IE 9.0+! For Firefox you'll need .ogg file or .webm video files as sources! Here is an image containing all supported video formats in HTML 5: …
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