I believe IE requires the H or MPEG-4 codec, which it seems like you don't specify/include.
You can always check for browser support by. › en-us › forum › all › no-html-video-play-i.
Can I use the MPEG4/H video format
Can HTML5 be enabled for I.E? support in IE for Windows 7.
Video: Ie11 html5 video firefox Chrome 44 vs Internet Explorer 11 IE Web Browsers HTML5 Video Test Offline
use flash even though Firefox and Chrome can play the same live video.
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Internet explorer 11 under windows 10 does not play HTML5 videos Super User
Sign up using Facebook. Can you share exact ffmpeg command?
Never had this problem beforeso what has changed to cause it? Feedback post: Moderator review and reinstatement processes.
not recognized by IE 11 HTML & CSS The SitePoint Forums
Can you share the whole command of FFmpeg? Sign up using Facebook. Didn't work for me.
Video: Ie11 html5 video firefox Enable Full HTML 5 in Firefox / Linux
They are the best resource to troubleshoot this issue.