Cool to know that Viddler tried it, I didn't knew that. We'll try to get in touch with them. And yes you are definitely right about the progress bar getting to cluttered, we actually have an other UX in pipeline for that, which we think could solve this problem :
https://drive.google.com/open?id=1YLgpEIpS7zVf3LdyQtIdGZ3SHHUo_9Xn

What do you think about it ?