Since it has just been released, any fixes in the program would be much easier and faster if there was more feedback from people who have tried it. I'll keep looking though.

whats the the final video extension? and does it support .rmvb?

Nearly all movie types are supported. However, I haven't added all of the extensions yet, so certain movie types might not visible when choosing a movie. If this happens, simply click on the bar that say "Movie Files" and select the "All Files" option instead. That should fix any problems with certain movies not appearing. A picture is attached below for clarification.
Additionally, I have uploaded the newest version which fixed a major flaw that prevented Finally v2.. from working. Downloading the newest zip from https://xacto.folders.io/Finally is required to ensure functionality, as some files and folders have been created/deleted, and the script has been revised. If you have a movie extension that is not included in the graphical menu, feel free to post it and I will add them accordingly.

Also, make sure to:
A)extract it
B)not have a finally folder within another one.
  eg: /users/yourname/finally/finally/
  This happens because some people press "extract to /finally/" on winRAR which makes this happen
C) Have it in your user name folder

EDIT: I just happened to be reading a couple of posts on tiplanet.org and I found out there is a way to have high quality videos that aren't affected by jpeg compression. (Thanks Hayleia) Included in the zip file is a Finally 2.1 LQ and a Finally 2.2 HQ. Now you can watch your videos in the same quality they were downloaded.
EDIT: GIF support should be implemented soon.

Great, I'll try this ASAP

Ok. Hopefully you shouldn't have any trouble.

EDIT: GIF support should be implemented soon.

Very good idea
Especially with NspireMoviePlayer since it loops.

If anyone knows about a good and simple gif to movie converter that supports command line processing, please let me know.

I installed FFmpeg, what is PATH, most I know is that it is system environment variables

EDIT: I put FFmpeg in Path. When I ran the program it says,"Could not open file : C:\ffmpeg\Finally\output\Frames\frame-00001.jpg
av_interleaved_write_frame()\output error. When running Finally 2.2 it says "cho is not recognized as an internal or external command" and option "sameq" was removed.

If you look a few posts up there is a better version that is more user-friendly.
All you have to click is Finally 2.1 LQ.exe or Finally 2.1 HQ.exe, and not have to use confusing command prompts.
However, I did run into problems with it not being able to find ffmpeg so I had to copy every thing from the folder into the main folder.

Thanks, I don't think I had ffmpeg installed. Do you know where I can get it though? And for the videos to work properly, do you need to be running Ndless 3.0? I have Ndless 3.1 installed.

Hi!

Thanks for trying to help, but it didn't work. I tried to open the ffmpeg.exe that was in the zip, as well as pretty much all the other executable files, but all that happens is that a dialog box opens for one fifth of a second, and then disappears. Nothing else. And it still shows the same error.

If anyone has it, the main reason for me wanting to be able to make the .tns movie files was because of the rickrolling video. Does anyone have a Rickroll.tns? If so, could you upload it here? It'd be appreciated. Thanks.