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Read Open web annotation of audio and video by Jon Udell (Jon Udell)

Text, as the Hypothesis annotation client understands it, is HTML, or PDF transformed to HTML. In either case, it’s what you read in a browser, and what you select when you make an annotation. What’s the equivalent for audio and video? It’s complicated because although browsers enable us to select passages of text, the standard media players built into browsers don’t enable us to select segments of audio and video. It’s trivial to isolate a quote in a written document. Click to set your cursor to the beginning, then sweep to the end. Now annotation can happen. The browser fires a selection event; the annotation client springs into action; the user attaches stuff to the selection; the annotation server saves that stuff; the annotation client later recalls it and anchors it to the selection. But selection in audio and video isn’t like selection in text. Nor is it like selection in images, which we easily and naturally crop. Selection of audio and video happens in the temporal domain. If you’ve ever edited audio or video you’ll appreciate what that means. Setting a cursor and sweeping a selection isn’t enough. You can’t know that you got the right intro and outro by looking at the selection. You have to play the selection to make sure it captures what you intended. And since it probably isn’t exactly right, you’ll need to make adjustments that you’ll then want to check, ideally without replaying the whole clip.