Very neat! Did you consider using podcasts?<p>You can change the album art with Chapter Art defined in the podcast feed.<p>That way the audio track would remain “whole” and the xml feed would do the work of changing album covers.<p>I do not know the frequency of changes (see the chapter length) you can make, or if there are any limits to the numbers of chapters per podcast.<p>Assuming a high enough frequency is permissible, you might get your shot at “video” again.<p>Check out the ATP.fm podcast - they occasionally use chapter art.<p>Also, checkout Forecast by Overcast which can help you set chapter art.<p><a href="https://overcast.fm/forecast" rel="nofollow">https://overcast.fm/forecast</a><p>Good luck with your venture!!