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nightfall
Easy to use lib for creating on-demand transcoding sessions for efficient media playback. (by Dusk-Labs)
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Plex has a fork of ffmpeg where they add a throttling mechanism but I'm not sure on the specifics of it. In Dim we throttle ffmpeg by telling the OS scheduler to pause or unpause a process. We achieve this on Linux by using SIGSTOP and SIGCONT. On windows we use some undocumented APIs that essentially do the same thing. You can see more details here: https://github.com/Dusk-Labs/nightfall/blob/master/src/utils.rs
I've been messing around with Emby and Plex media managers recently and one cool feature that I found interesting is that both of them are able to stream media to other devices with the help of FFMPEG. Specifically, they are able to use this stream as an input to HTML and browser video players. With seeking support.