If you're posting a video clip or an audio clip attached to a post, remember to include a text description which describes the sound. This is important so that the video or audio is accessible to deaf people.
Also, if it's a video, it's important to describe both the sound and the visuals so that it's accessible to everyone.
Text descriptions for audio and video are added just like text descriptions for images (exact steps vary depending on which app you use).
Of course, if I were to describe a video, I'd have to go as much into details. However, there'd be a whole lot more to describe.
The video would constantly change. It would show much much more than a still image. There'd be audio that'd require detailed description instead of just name-dropping. All of it. Yes, including panning position. Movements of my avatar would have to be described. Movements of the camera around my avatar as well as independently from my avatar would have to be described. All movements would of course require distances, angles, speeds and changes of speed
The description would require a time code: Everything that happens would have to be mentioned including when exactly it happens, and since things might happen quickly or in quick succession, I'm talking about at least tenths of seconds.
Ten minutes of in-world video would take me weeks to describe, and the description would be the length of a novel and take a whole day to read.
Mastodon users would never see the post with the video because, as far as I know, Mastodon automatically rejects all external posts that exceed 100,000 characters, and I'm talking about millions of characters here. I don't even know if Hubzilla would let me post that much, and Hubzilla doesn't have any character limits except for what the Web server can handle.
Nobody would ever read this, so the whole effort would be in vain. But anything less than this would be critically lacking.