Ensure that when you render your Camtasia video, that you choose closed captions. This setting can be found under custom production settings when you choose to create the Mp4.
This will produce an MP4 but also all of the associated files which are necessary for the Smart Player. When uploading to Media Central, you only need to upload the MP4 file which is produced.
Once you have created captions, you then need to export your captions as a .srt file from Camtasia:
To view the file right-click on the srt file and choose open with... The .srt file can be opened using Firefox or Notepad.
Media Central uses JWPlayer as the method of video and audio playback, JW Player by default comes with the option to over lace CC files provided they have been produced.
For caption files, Mediacentral accepts VTT, srt or Dfxp files. The subtitle/caption files can be uploaded either during the upload process or afterwards.
To upload your video with captions to UCL MediaCentral:
Subtitles can be turned off or on by the viewer by clicking on the cc icon. The viewer also has the ability to download the subtitles separately as an attachment.