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Hi, I have been uploading mp4 from powerdirector 16 to wordpress all Fall (new user of cyberlink) but suddenly today the mp4 is not accepted by wordpress even thought I am using the same settings. It calls it a security reason. I updated my power 16, but no luck. It will take avi files, but they are much larger. An older mp4 video produced in another program uploaded fine. None of my current powerdirector 16 mp4 files will work at this time to go into wordpress. I can't understand it. Thanks.
Sounds like you may want to contact someone at Wordpress and provide them with a PD-produced MP4 video that was originally accepted but that is rejected now.
According to this support
page, they also accept WMV, which is a format that PD can produce to. The video files are similar in size to MP4s, but WMVs will probably take longer to produce, especially since hardware acceleration is not available for that format. Still, it may allow you to upload content while you sort out the MP4 issue.