I am trying to manipulate mp3 tags on a certain web service that is running on rails.
No problem if I could upload the mp3 on to the server and handle it locally, but this is not the case.
I want to be able to select, manipulate and save mp3s solely on the client side, preferably on JavaScript, but anything client side will do.
I know there are techniques on manipulating local files client side, but is there any knowledge on how to do this on mp3?
Impossible unless you make a flash player that can change the tags, and then give it to the user via a download. I'm not sure for an example as I don't play with flash at all :)
But server side scripts will help you there, I think all you would need to do is add an extra http-header or use a php class that lets you modify the tags. if you need them to be dynamic that is the only real option that I can think of for you.
Sorry if that is not what you wanted to hear, but its all I can think of for an option.