Hardcoded subtitles is also called hard sub, build subtitles or embedded text. These are the ones that are already embedded in the movies and the user cannot use tools to remove this option. These subtitles are irremovable and cannot be changed or removed altogether.
Soft subtitles can be removed using the some VLX and video player. If your subtitles are already embedded in a certain video, We usually use three methods to remove them:
by cropping the video and keeping only the areas of the video without the watermark.
by adding a sticker or image to the video to cover up the area with the watermark.
use GhostCut software, a fully automatic watermark processing software . This software is very easy to use . Just upload the video, he will automatically detect the location of the watermark and automatically erase. At the same time, he also supports the protection of the erasure area by way of markers, or the erasure of specified areas.
You can see the detail guides in this link.
How to Remove Subtitles from a MOV,MKV,MP4,AVI Video online-2023?