Searched and found a resolution for getting ACF to work dynamically with an embed in the video player, but I am having no luck with a plain video source url.
I have tried text, url, link field types all with the same issue. The media is rendered unplayable. The poster, and every other dynamic field on the page works just fine, except the video (.mp4) source.
Not sure if this is an issue with Pro, ACF itself, or a combination of both.
Using Pro 4.0 RC2 currently, but this was an issue before trying the beta also.