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See #89. Right now, only videos embedded with HTML5 or wrapped by UniversalSubtitles are supported.
Looking into it. It's easy to do with the IFrame API, however the videos on pyvideo use the old (deprecated) object embed. I don't know if we can use the same code or if object embeds need more work.
The reason we're using the object embeds is because that's the only thing that UniversalSubtitles supported. But then UniversalSubtitles stopped working and I had to disable it site-wide.
So, maybe the solution here is to defer this specific problem and instead either: