S03E03 uses intentional film grain for its flashbacks. If you are re-encoding, avoid heavy "denoise" filters, as they will destroy the artistic intent of the episode.
ffmpeg -ss 00:15:30 -i "The.Boys.S03E03.mkv" -t 00:02:15 -c copy "boys_s03e03_clip.mp4" the boys s03e03 ffmpeg