After a little bit of digging, I found an article which inform us:
As we all know, video formats, such as MKV, MP4 and AVI, can contain several subtitle streams in different formats or languages in one file. Technically, subtitles are divided into two types: hard subtitle and soft subtitle in video files. Hard subtitle is a part of the video images, and you cannot disable or hide it when playing the video file. Soft subtitle is an independent stream, and you can turn on or turn off it when playing.
The article also introduces a method on how to remove subtitle from MKV, MP4, AVI, etc at: Subtitle Remover How to Remove Subtitles from MKV AVI MP4 on Mac and... happy with it.
I recommend iDealshare VideoGo which can remove subtitle from avi video files and convert avi to avi or even other video formats like vob, mp3, mkv, wmv, 3gp, mov and etc.
The following a step by step guide on How to Remove Subtitles from MKV Video Files on Mac or Windows
in fact this guide also applies to remove subtitles from MP4, AVI, FLV, WebM, OGV, VOB, MPEG, RMVB, WMV, WTV and etc.
It depends on what kinds of subtitle do you want to add. The hard subtitle compresses the subtitle file and the video stream in the same set of data, like a watermark, which cannot be separated.
The only subtitle you can remove is soft subtitle. Here is the guide on How to remove subtitle.
Subtitling Services
The subtitling service are required to be present in videos so that it can cover additional audience around the globe and thus improving the reach of the video.
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