How do I create a caption file for an external video?
Create Caption Files
Amara is the same service referenced in our lesson about creating captions in Canvas. The difference is that with YouTube and other third-party sites, your video is already uploaded to the Internet, so to create captions, all you need is the URL to the video.
Note: Your video must be publicly accessible for the URL to work and stored on a supported third-party site.
Upload Caption Files
Most online video sites that support closed captioning will have a link to upload caption files. Each site will have its own requirement for the type of file required.
YouTube accepts a variety of file types, the most common being .srt, .sbv, and .txt. If you grant them permission, sites such as Amara and CaptionTube can link directly to your YouTube account and add the caption files directly to your video.