Various subtitles formats can be usually converted between each other using specialized subtitle editors. So you can for example use the popular Subtitle Workshop and convert your .srt (SubRip) subtitles to a Cavena subtitles (.cip files).
Convert SubRip video subtitle format to Cavena subtitles file.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert srt to cip on Windows
A free subtitle editor
Convert from srt file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.