Currently to get the stream from ffmpeg into nginx you have to do the following:
ffmpeg -re -i input_file -c copy -f flv rtmp://nginx_server_url:1935/app
It would be nice to have the ability to set up an app block that looked kind of like this
The one thing I've always wanted from nginx-rtmp was the ability to pull from a source input instead of running a separate process with ffmpeg to push the stream over. If they could get that working my life would become less complicated quickly.
I have an HLS live stream with less than 1 second of latency. If you have a keyframe interval around 5 frames, the player can start playing when it receives 15 frames.