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1. All DMC video editing stations have Aegisub installed and it looks like this:
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.
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.
6. For more information, visit http://www.makeuseof.com/tag/subtitles-text-editor-aegisub/
Create SRT with NotePad
1. Open Notepad, WordPad, or other text editor that allows to save file with SRT file extension.
2. Edit subtitles shown as below:
  Notes: SRT consists of four parts, all in text.
  1. A number indicating which subtitle it is in the sequence.
  2. The time that the subtitle should appear on the screen, and then disappear. The time format used is hours:minutes:seconds:milliseconds, with the milliseconds field precise to three decimal places.
  3. The subtitle itself.
  4. A blank line indicating the start of a new subtitle.
3. Save subtitles to .srt format:
  1. In Notepad, please click menu File->Save As, change file name to “xxx.srt”, set “Save as type” to “All Files”;
  2. Set “Encoding” to "ANSI" if using English subtitles, or “UTF-8" if using non-English subtitles.

Text Wrangler

How to encode subtitles

To add subtitle to your videos, you may use freeware HandBrake. HandBrake is available on all DMC video editing stations and can also be downloaded to your computer for free.

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Open HandBrake, click the Source button and choose your video file. Then choose a destination for your output file, and be sure the output file format is MP4, and leave everything else as is.
Now click on the Subtitles tab on the center and click Add External SRT.... Pick the SRT file and it will show up in the list box below
You can add more than one subtitle file if you need, i.e. for multiple languages.
Last, click on Start to start encoding your subtitles.

Creating subtitle with toast is not an option.

Test it with JW Player.

How to add subtitles in YouTube or Vimeo

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1. Log into your YouTube channel.
2. Click on your account located on upper right corner, then click on Creator Studio
3. Within Creator Studio, click on VIDEO MANAGER on the far left .
4. Next to the video you want to add subtitles to, click the drop-down menu next to the Edit button and select Subtitles and CC.
5. In the drop-down menu, choose the language that's spoken most in the video and click Set language.
6. Click the Add subtitles or CC button.
7. Choose the type of file to upload
8. Click the Choose file button and browse your computer for the file
9. The file will auto-populate and let you know the timing of each subtitle or closed caption. Clicking the "CC" icon in the YouTube player turns the subtitles on.
Note: If you dont have subtitle file, YouTube automatically generates the subtitle for your video. You can edit this subtitle instead of creating your own subtitle file. To do so, click on English (Automatic) to open the auto subtitle, then click on edit button to start editing the subtitle. Click on Publish edits to save the updates.
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For more information, visit https://support.google.com/youtube/answer/2734796?hl=en