I have the next code in my index for a video:
Are the paths valid?
https://root/folder/video/v1.ogv
https://root/folder/video/v1.webm
Firefox doesn't support .mp4 files which explains the Specified "type" attribute of "video/mp4" is not supported.
error.
If you are using Apache, you can force it to use the correct MIME type. Add the following to your .htaccess file.
# MIME types for Video
AddType video/mp4 mp4 m4v f4v f4p
AddType video/ogg ogv
AddType video/webm webm
AddType video/x-flv flv
@Gonzalo- As @Daniel has pointed out in his answer - make sure that /video folder in source tag is accessible. For example - you are accessing your page at
https://abcdomain/approot/somepage
and assuming that you have this video folder inside approot, then you need to modify the source tag and it would be something like -
<source src="/approot/video/v1.ogv" type="video/ogg">
Hope, this helps.