(best for sync accuracy)
There are community-maintained technical documents that list detailed file specifications for Season 4 episodes, including bitrates, audio/video codecs, and file sizes for 1080p and Blu-ray versions. Outlander TV Show Written props, letters, news papers, etc.
Season 4 in 1080p HD, there are several interesting technical and analytical resources available regarding the show's production and visual details for that season: 1. Technical & Production Insights
Here's the direct solution: