SRT to SBV (Youtube Subtitles) Online Converter 

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YouTube Captions (.sbv) 

.sbv is the file format outputted by YouTube's Automatic Timing feature which creates automatically timed captions based on a transcript.

File used by YouTube videos to display subtitles or closed captions; contains one or more captions in a plain text format; specifies an ID, start and end time (using an H:MM:SS.000 format), and text for each caption.
More Information SBV files are used to display text captions at specified times during video playback. They are similar to .SUB and .SRT files.