Our flash-based player supports “SubRip” files (files with “.srt” extension). About a month ago, we updated our video pages to automatically support subtitles.
One simply needs to upload a file with a “.srt” extension (in the SubRip format) along with the video file to get started. If the item includes multiple video files/tracks, you can make multiple .srt files, example:
cow1.avi
cow1.srt
cow2.mov
cow2.srt
We support multilingual subtitling as well. Our suggested naming of .srt files for language-based tracks for the best display on our site is like:
cow.mov
cow.en.srt (english)
cow.fr.srt (french)
cow.hu.srt (hungarian)
and our site will show a selector for the three different languages
subtitle: [ en | fr | hu ]
next to the video track in our player.
Example short video with subtitling.
Enjoy!
–Tracey Jaquith

waf said
Hi. I uploaded a video and added slovak and english subtitles. But the slovak subtitles are mixed up, you know, it doesn´t show them correctly. It probably does not support diacritical marks. Can you do something about this?
Here is the video and subtitles:
http://www.archive.org/details/Training_and_tragedy-Elephants_in_Circuses