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The difference between subtitle and caption :

• Captions include subtitles plus a written description of what is occurring in their videos for viewers who might not be able to hear or understand the sound.
• Subtitles provide viewers with a video’s dialogue in written form and can be used to translate the spoken language.

The benefit of adding subtitle to videos:

•  Subtitles enable deaf and hard of hearing users to watch videos. This is important for all video publishers especially educational institutions who need to comply with accessibility laws and internal policies.
• They also act as metadata that helps your videos show up in more places on YouTube.  

Subtitle formats:

• There are many subtitles formats, such as SRT, WebVTT, DFXP/TTML, SCC, and SAMI files, but the most commons file is SRT. 

What is SRT file:

• SubRip caption files are named with the extension .SRT. This format is supported by most video players and subtitle creation programs. The time format used is hours:minutes:seconds:milliseconds, with the milliseconds field precise to three decimal places. The purpose of srt subtitle file is to be used with desired movie file together to display subtitles when you play video file by any player supporting srt subtitles. If your video doesn’t include any subtitles, you can create and add a .srt file to your video.

How to create SRT file:

There are two ways to create SRT file:

1. Create SRT file with Aegisub:

1. 1. All DMC video editing stations have Aegisub installed and it looks like this:
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   2. Open Aegisub, simply enter your caption text alongside a start and finish timecode. The first timecode is a start timecode for this line of text; second timecode is the finish timecode; the third timecode is the line duration. You can adjust the timecode according to your video. Press Enter to add this line to the sequence window below.
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   3. Use spacebar to play and pause your video with any media player or within Final Cut Pro X while creating SRT file with Aegisub. Try to make the start and end timecode as accurate as possible.
   4. Repeat the step 2 until all the lines are inputted.
   5. Go to File > Export As..., continue to click on Export, and be sure to save as SubRip(*.srt) file type.
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 Add subtitle in Vimeo: https://vimeo.com/help/faq/managing-your-videos/captions-and-subtitles#what-caption-and-subtitle-file-formats-does-vimeo-support

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