Just ran across this. Files that are added to favorites that are not included in the library are not picking up the time duration, video and audio codecs, resolution, and audio channel count. The do get the graphics and metadata for the shows but not the technical info that infuse gathers from the actual file.
The same files added to another share that is included in the library do have all the info.
Once you play or start to play one of the files that doesn’t have the above mentioned info it will populate that info .
This is repeatable on multiple ATVs both 4 and 4K all running tvOS 12 and Infuse 5.8.2
The below pics are after the initial scan finishes and the wheel on the home page shows a round arrow instead of the spinning wheel.