fd -e mkv -x mkvpropedit {} --set title="" --edit track:v1 --set name="" --edit track:a1 --set name="English (AAC 5.1)"

fd -e mkv -x mkvpropedit {} --edit track:a2 --set name="Commentary #1 (HE-AAC 2.0)" 

fd -e mkv -x mkvpropedit {} --edit track:a2 --set name="Commentary #1 (HE-AAC 2.0)" --edit track:a3 --set name="Commentary #2 (HE-AAC 2.0)"

fd -e mkv -x mkvpropedit {} --edit track:s1 --set name="English (PGS)"

fd -e mkv -x mkvpropedit {} --edit track:s1 --set name="English (PGS)" --edit track:s2 --set name="English SDH (PGS)"

fd -e mkv -x mkvmerge --output "remux_{/}" --title "" --default-language eng -a eng -s eng --no-global-tags --no-buttons --no-track-tags --no-attachments "{}"