An objective measure of correct 24p handling

I’m having a little bit of stutter problems with Infuse, however I’m not absolutely positive that it is in fact better with any of my other streaming options (VideoExplorer on ATV4, Beamer from macbook).

So I found this little test, to tell if a 24p signal is in fact shown correctly on the tv:

There is a downloadable file there, which you play on the tv while taking a long-exposure (1s) photo with a camera. If everything is well the image will be uniformly grey, if this is not the case there is something wrong somewhere in the chain.

Here I found a guy who seems to verify that the ATV4 can in fact produce a 100% correct 24p image on a sony tv (swedish, but see the images):

I’ve tried to reproduce this result with an iphone 6, using the free apps “Manual Cam” and “Slow Shutter Free” which can both take a 1s photo, however I can’t reproduce the above results. I guess this may be down to wrong settings on my tv (tried a lot), Infuse, ATV4, the used photo app’s etc., there are a lot of possibilities.

Can anyone who might find this interesting verify, that they in this way can take a uniformly grey image of the tv showing the mentioned video?

Doesn’t Sweden use 50Hz? Would a TV running on 50Hz see judder on a 24p video?

I guess so, but they write that they run the ATV on 60hz. As far as I understand it the “50hz in europe” either refers to the power line frequency (which I believe is irrelevant) or the PAL frequency of 25hz/50 fields. The tv’s in Europe can show all the hz (the modern ones at least), including 60hz and some of them use some tricks to unwrap a 24hz signal from a 60hz signal. But I’m no expert, it gets complicated rather quickly, different implementations etc. :slight_smile:

Myself I am in Denmark and outputting 60hz too.