So basically you're pointing internal links from galleries/videos to categories/tags? If that's the case you should be in the clear if you've got more than just anchor text on the page, if not then you should use canonical tags.
In general, it would be a bad idea to roll back on all the optimization. More often than not it would have a negative impact on your SEO. It's a bit of a complicated issue depending on how big your collection of videos and galleries is. Categories and tags should be your primary concern, they're usually the ones pulling in the traffic, while the content itself could rank for specific long-tail keywords or variations based on model names, types of scenes, branded titles, etc.
With all that being said, it's hard to give you a piece of solid advice without deeper insight into your site.
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