question #1 why you dont write the video delay on video track if i dont put the video delay and mux putting the audio delay on audio track they will not be sync right? if if dont put the video delay like on this picture? https://i.imgur.com/euL3BLS.gifv question #2 can you add delay for subtitle if someone make custom bluray (mkv) like me sometime we only put delay on subtitle instead of really fix it in subtitle edit. thx for your work only demuxing mkv tool to tell the delay other are shit !! mkvcleaver,mkvextractgui,inviska...