It could very well be detected by a good forensic analysis. While, I'm not expert on the matter, I would guess that base on the film used, one could detect if that type of file had the proper gamma to record whatever scene that you're transferring. While film isn't as sharp as digital, just the transfer process could degrade the image more and make the fake noticeable - especially depends on how you copy it. Even with a high quality film recorded, the copied image has a certain look that doesn't look like an original image. I used to use a film recorder in our transition from film to digital, ans it's hard making a good rendering. If you just attempt to copy a screen, that will be noticeable due to the screen makeup. Also highlights and shadows might be clipped with the digital version that wouldn't be with an original film. Digital images have noise in the shadows, which might show in the transfer process, where as film will not have noise. These are just a few things I could think of that might cause issues.
If I simply filmed the video with a regular camera, would the resultant film pass intense authentication?
It wouldn't even pass superficial inspection. One could go on in endless detail about this from the actual physical resolution, to exposure, noise, color dynamic range up to actual technical inconsistencies in the edited video to begin with, but suffice it to say that a reasonable experienced graphics/ effects/ 3d person like I happen to be doesn't even need the actual film in hand to tell whether something is fake. any criminal who attempted to do this would have to run his own visual FX facility with all the trimmings, he would have to be a top-tier expert at this and clearly would need much different tools than just Photoshop. So if you want some sane advice: Ditch the whole idea. In this day and age nobody is going to buy into it. People see such fake stuff on CSI and movies all the time and everyone is aware of it just like most "found footage" mysteries and conspiracies can easily be busted with an objective analysis.
Thank you! This is great! This means the character in my story is in some big trouble!
This is great info! Thank you so much. It means the character in my story would need to use his paranormal powers (not kidding) to achieve something like this. Many thanks to you. You solved a major plot point in my novel.
I wonder how many crooks in real life have gotten nailed on something like this. Actually, probably none, if the fakery is so easily detected.
This was a most excellent reply! A thousand thank yous!