How to Open & Convert SRT Files and Add SRT subtitles to Your Videos
What is an SRT File?
A file with the .SRT file extension is a SubRip Subtitle file. These types of files hold video subtitle information like the start and end timecodes of the text and the sequential number of subtitles.
It’s important to note that SRT files themselves are just text files that are used along with video data. This means the SRT file itself does not contain any video or audio data.
How to Open SRT Files
Notepad++ or any other text editor can open SRT files since they’re just plain text files.
Jubler and Aegisub are dedicated SRT editors if that’s what you’re looking for.
However, the most common reason someone wants to open an SRT file is to use it with a video player so that the subtitles will play along with the movie.
In that case, you can open an SRT file with programs like VLC, MPC-HC, KMPlayer, MPlayer, BS.Player, or Windows Media Player (with the VobSub plugin). The SRT format is supported for YouTube videos as well, meaning you can even use the subtitles in one of your YouTube videos.
For example, when you have a movie open in VLC, you can use the Subtitle > Add Subtitle File… menu to open the SRT file and have it play with the video. A similar menu can be found in all the other video players mentioned above.
Note: Some of those multimedia players probably can’t open an SRT file unless a video is already open. To open an SRT file without a video, just to see the text, use one of the text editors mentioned above.
How to Convert an SRT File
Some of the SRT editors and video players above can convert SRT files to other subtitle formats. Jubler, for instance, can save an open SRT file to an SSA, SUB, TXT, ASS, STL, XML, or DXFP file, all of which are different types of subtitle formats.
You can also convert SRT files online at websites like Rev.com and Subtitle Converter. Rev.com, for example, can convert the SRT file to SCC, MCC, TTML, QT.TXT, VTT, CAP, and others. It can do so in batch and will even convert the SRT file to multiple formats simultaneously.
Note: An SRT file is just a text file, not a video or audio file. You can not convert SRT to MP4 or any other multimedia format like that, no matter what you read elsewhere!
Source From: lifewire.com/srt-file-4135479
How to Add SRT file to your Movie videos
Although most times it is perfectly fine to keep our video and subtitle files separately, as most players support external subtitles those days, sometimes there is a need to add the subtitles permanently in a video file. For example many devices, like a tablet, smartphone, handheld video player, do not support those subtitles or display them poorly. The solution is to add the subtitle into the video file, making sure that it will appear no matter what. Brorsoft Blu-ray Video Converter Ultimate is a powerful all-in-all video tool, which can both convert Blu-ray, DVD, and videos in all popular formats and customize subtitles for movies.
This video app allows users to add and load external subtitles(*.srt and *.ass, *.ssa) as a part of the movie with the option to turn the subtitle on and off. What’s more, this package tool is mainly for users to rip/convert Blu-ray/DVD and any HD videos for different uses such as playing on iPad, Galaxy Tab 3, Samsung Galaxy S4, Surface 2 and more. If you are running on Mac, turn to Brorsoft iMedia Converter for Mac. Below is the guide about how to attach subtitles to movie videos.
Guide Here: Add Extenal Subtitles to Movies