Some things are just better left to the desktop and not the web, I'm afraid. FFmpeg is a part of most standard desktop Linux distributions, and can easily be downloaded for other systems. Apparently installing software locally is a horrifying predicament now.
Encoding videos on the desktop with the native FFmpeg code will not only yield better performance, but I can't think of a scenario why you'd want to use as a web-based service.
Create screenshots? Really? What a complete triviality. I guess using standard software and hitting the PrtSc key is too difficult in comparison to using the browser for everything. Making screencasts is a different issue, but also one you'd do locally.
Porting software to multiple platforms can be a pain, and a source of bugs. If there's an update it has to manually installed by each person. Then you have to remember where you put it, or which one is in your $PATH. And if you want to send it to someone else, you have to find the right version for their machine and figure out where they can download it, or how to copy it over to them. <- These problems are all solved by having a single URL you can visit or share, where the latest version of the single codebase runs every time.
> Some things are just better left to the desktop and not the web
That list changes every year, too. As JS runtimes get faster, more and more is now possible in the browser that would've been fully impractical just a few years ago. In just a few more years, I predict that stuff like video processing won't be so far-fetched either.
Honestly, I think this project was to show what could be done all inside the browser. This is a very cool idea, and is extremely impressive for being done in a weekend. Don't be that guy--maybe you should find some passion.
Encoding videos on the desktop with the native FFmpeg code will not only yield better performance, but I can't think of a scenario why you'd want to use as a web-based service.
Create screenshots? Really? What a complete triviality. I guess using standard software and hitting the PrtSc key is too difficult in comparison to using the browser for everything. Making screencasts is a different issue, but also one you'd do locally.
Sorry if I'm not so passionate.