ffmpeg -i "Unfolding.mkv" \ -map 0:v -map 0:a:0 -map 0:s:0 \ -c copy "Unfolding_cleaned.mkv" (Adjust a:0 / s:0 to match your language) WEB-DL is already compressed, but you can reduce size further with minimal loss.

md5sum "Unfolding -2019 WEB-DL-.mkv" > checksums.md5

ffmpeg -i "Unfolding.mkv" \ -c:v libx265 -crf 20 -preset medium \ -c:a copy -c:s copy \ "Unfolding_small.mkv"

Would you like a that automates most of these steps for a given WEB-DL file?

ffmpeg -i "Unfolding.mkv" -map 0:s:0 subs.srt

ffmpeg -i "Unfolding -2019 WEB-DL-.mkv" -c copy -copyts "Unfolding_fixed.mkv" MKV is preferred for preservation.