Video playback issues on AppleTV

I’m a new user having upgraded from iMovie but am having a play back issue with my 1st rendered movie. The issue is that the audio plays fine but the video appears as a series of still images (roughly one image per scene). I’ve tried Googling solutions but have drawn a blank so hope someone has an idea on what I’m doing wrong.

My set-up is:
2017 3.4ghz iMac (retina / i5) with 16gb ram / running OSX11.1
Source movie is from Canon 5d mk3 (.mov format)
Edited on Resolve v16 & also v17.1B build 10
Project settings 1920x1080hd, 25fps,
Render settings I’ve tried default settings for YouTube in QuickTime & MP4

Playback
The good news is that I can import the video & play back the rendered video using AppleTV on the iMac.
The issue happens if I try to play video on the AppleTV app on my LG smart TV (connected to the same network via Ethernet) or on an iPad connected via WiFi. So I can & select the video but can only hear the audio and see a series of still frames.

Things I've tried:
- I’ve rendered different clips ranging from 10 secs to 6 mins and the same video playback problem occurs.
- I've tried using other default setting
- I've played other movies that are saved in the same location & have been imported into the same Apple TV library that have been rendered using iMovie or Adobe Premier. These all play fine.

Connectivity / bandwidth issues don't to be the issue so wonder if its my project/rendering settings which are the issue causing some conflict with AppleTV apps?

I’m happy to provide any other relevant information but attach a screen print of the main project settings.

I'm really enjoying using Resolve however as TV play back is a key requirement for me I hope that I can find a better solution than returning to iMovie.

Cheers

Test a short clip using the following settings. (With resolution and fps adjusted accordingly.)

Best Quality Encoding.jpg (81.37 KiB) Viewed 345 times

Hi Jim,
Thanks for the quick response. I've changed the frame rate & key frames (although I couldn't see a check box for Encoder = Native) on my version. That has improved things a bit. The video changes frames more often so that playback looks like a flicker book. So not at all smooth but an improvement on a still image!
I attach a copy of the render settings as I see them.

Solved!

After more research and testing I've found that using DNxHD codec in Resolve worked if I then converted the rendered file into MP4 (Apple preset) using Handbrake. Hope this may help others struggling to get their videos to play on Apple TV on TVs / iPads / iPhones.