CarrierWave - Solution for file uploads for Rails, Sinatra and other Ruby web frameworks.
Vimeo - Vimeo is a social media app that lets you share and capture videos. You can watch new videos in a variety of different categories, and you can share your own content right from your device. Read more about Vimeo.
tus.io - File Uploads
Zencoder - Audio and video encoding/transcoding software as a service.
Uppy - The next open source file uploader for web browsers
Verbit.ai - Verbit.ai is a business transcription and video captioning service.