They do use ffmpeg (maybe not for everything). They've published quite a bit about their encoding: https://netflixtechblog.com/high-quality-video-encoding-at-s

They do use ffmpeg (maybe not for everything). They've published quite a bit about their encoding: https://netflixtechblog.com/high-quality-video-encoding-at-scale-d159db052746 https://netflixtechblog.com/high-quality-video-encoding-at-s... https://research.netflix.com/research-area/video-encoding-and-quality https://research.netflix.com/research-area/video-encoding-an...