I'd like to discuss with one or more knowledgeable and patient experts about an app idea I have. I have encountered some deaf in the interior of NE Brazil and looked for an app to teach sign language to them. Books are OK but it's better if you can see the movement. My idea is to have a "dictionary" of a grid with pictures / names of objects. When you click on the picture a short video or animated GIF (for file size) show a person making the symbol.
It's just a picture/video viewer and I though I'd find something I could modify but haven't had any luck yet.
Should I use GIFs or video? Should I try to copy a wad of files to the phone or try to put them in the TinyDB? Though internet is rather widespread, the deaf are usually on the poorer side and (in the interior) don't usually have phones or access.
What are your thots?