@Leslie Beaumont

As you can see in our demo page the preview image works fine for MP4 files: demo.joomlaworks.net/allvideos . I suggest to check the file permissions and also try to use filenames without spaces or other special characters.

Thank you for your swift response. You we right it was the spaces in my file names although this did not appear to be an issue for the video link it was stopping the poster frame. Thankyou

You are welcome.

Just use the simple video tag with no extra code (img='kdjfkdfkjjjjjjjj"). Name the image file with the same video file name and upload the image in the same video folder.

I would suggest you use filenames without spaces.
Furthermore both links produce 404 errors.