While watching YouTube videos online I need subtitles but they are not attached to YouTube videos. I have subtitles files in my machine.
Is there any way to attach subtitles from your system to YouTube videos?
If you are trying to add subtitles to the video being played, you can use the chrome extension YouTube SubTitles
This plugin allows to attach .srt files to the YouTube videos.
I have created a Chrome extension for the same purpose.
You can check it out here: Subtitles For Youtube
An overlay subtitle player is a more general solution in case you are watching videos not only on Youtube.
I developed Penguin Subtitle Player which is an open-source, cross-platform standalone subtitle player. It supports all Windows, Linux and Mac OSX. It can always stay on top of flash player and HTML5 full screen so using it with online videos has no problem.