Open Subtitles

This add-on works well - when there are no ads interrupting the video. But nowadays (in the West) this is rare. I have this streaming website called shout.tv, where I watch 30 minutes TV serials episodes. At the 0 second, when the website's player starts to play after I made a video request, it begins to play a 15 seconds long ad. And after that begins the video. But no matter when I start the opensubt add-on, and when I load into it the local subtitle from my computer, it could be during the ad or after a few seconds that the requested video begins, the subtitle is already 15 seconds ahead of the (requested) video. So the time of the subtitle, which can be seen on the add-on, and the time of the video, which can be seen on the website's player in the lower left corner, are different, by the duration of the first ad, which is 15 seconds. Let's say, the video shows that the time is 37 seconds into the video. But the subtitle add-on shows that the time is 52 seconds (37 + 15) and it shows me not the right subtitle, that would be the subtitle that is at the 37 sec time moment. So the subtitle shown on the video is not in sync with the video (and thus, the audio, the thing that is speaked). Surely, this can be fixed by applying a 15000 ms delay (because subtitles must appear 15 seconds later), and after that everything works fine. That is, until the next ad!... which is around the half of the video. And after that second ad, there's need for another adjustment. And is just not feasible, running around, patching time delays. I want to relax, not to get stressed. One fix at the beginning of the video it's okay. But not more. I don't know how subtitle add-ons in general know what time it is in the video? And if they can differentiate between an ad and a video that are played in the same player, one after the other, maybe based on some video ID?... Because if a subtitle add-on simply begins when the website's player starts, and there are ads intertwined into the video, then it's not OK. On billibilli, which is a Chinese streaming site, there are no ads, and this add-on works excellent. Usually, there's no subtitles to the videos there, the website's player doesn't have a subtitle button, and this add-on is a lifesaver, because I can play a local subtitle on top of the remote video, so that I can have a subtitle at all. Having video and subtitle coming from different locations, and combined together. That's genius. But back to shout.tv: I have to use the website's player's subtitle, that they provide. The subtitles are in sync with the videos (but if not, there's no subtitle adjustment possibility on that player). It's just that sometimes, with two rows subtitles, they just overlap each other, and I lose a part of the context. That's why I would need a (working) subtitle add-on.