@geoffla I have no idea of anything here/below will help… But I just thought I’d post this, just in case 
I’ve had this recently and after a lot of digging I could find/see that Plex wasn’t identifying the recorded files correctly. You can look-up my original forum post here:
There are still a couple of things left outstanding:
-
How can PMS better identify file formats
It’s clear that DVR, depending on your country, can be “mixed formats” during a broadcast. So changes are needed to FFMPEG to conduct a deeper/longer scan before deciding on format -
How are files are played on clients
The client is a different topic and I didn’t get a clear idea of how it works with deinterlace. This sent me down the rabbit hole on deinterlace. If you look at something like Jellyfin, it has an option to double the framerate switch is a good way to deinterlace. In that keeping the Hz/fps at 25 and merging two “frames” actually isn’t deinterlacing and can/does lead to artifacts on the screen
You’ll see that @ChuckPa took a look and the Plex team are aware of it. So it’s more of a wait and see.
In the meantime, I did look at “mediainfo” as this does actually identify the/my problem file correctly. No idea what it does under the hood, but I did start looking at whether I should make my own script to check and manually re-encode these files. I didn’t go any further though.
