I'm having trouble uploading the Kaltura HTML5 Video Player Widget, both through Widget Browser, and through trying to import the .zip file downloaded from Kaltura's website. Either way, I get error  File or directory does not exist. Any suggestions?
Meanwhile, I have found this website useful in writing the code to embed an mp4 video...
Contact your hosting provider.
Thanks, but my hosting provider, ISP, has nothing to do with the fact that Adobe's Widget Browser won't upload one of their own widgets. Moreover, this problem has been raised on these Adobe forums for over a year, and I've yet to see an answer. Writing the code myself works, and that's the option I've chosen.