Hi YogaJill! Just throwing in my two cents here:
Videos, and even the images we post aren't actually stored on the blockchain. While there are people working on interesting ways to do this, think of the blockchain like text. Text as in your words, your markup code, and your links. Images are actually links to images, as are videos. Dlive posts had a link to the dlive site, where they streamed to us our centrally hosted videos.
Whatever solutions the future may bring, there is nothing more important than keeping a hand on our content. Dtube is an interesting platform to use show, it is not a long term file storage solution (yet, at least).
In this way, dtube is just the most honest of all the video platforms. No one guarentees the long term storage of these files. Thinking about this makes me realize the benefits of posting transcripts in text.
Keep your pictures and videos locally! As content creators this is important to have control of our 'portfolio'.
Cheers!