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error playing some videos "no video with supported mime type found"
after upgrading to version 35 i get error playing some videos "no video with supported mime type found" video type mp4
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Do you have OpenH264 Video Codec provided by Cisco Systems, Inc. installed in about:plugins ?
To reset the mimetypes you can try to change the mimetype that cannot be found with these instructions:
Modified by guigs
This means that the HTML5 media player is used, but your computer doesn't have support for the various media files that are available. This may be a missing codec or basic MP4 support.
You can open the Web Console (Firefox/Tools > Web Developer) for error messages.
See also Windows Media Feature Pack for N and KN versions of all Windows 8 editions in case you use such a Windows version: