Nginx Rtmp 模块 - 在将 stream 重定向到另一个应用程序之前，如何在将 rtmp stream 推送到服务器时检查分辨率？

Question

I have a problem when developing a livestream system with nginx-rtmp-module. I have consulted some systems, there is a function that when pushing the rtmp stream, the livestream systems can recognize the resolution of the stream -> from there it will encode to hls with the corresponding profiles. For example stream 720p produces hls file with 360p -> 720p, if stream 1080p will produce hls file with 360p -> 1080p. I have tried the ways but no success. So how can I check the resolution and redirect the rtmp stream to the appropriate application for encoding. Looking forward to everyone's advice.

Answer 1

You should do this asynchronously:

Client ---RTMP--> NGINX ---Callback--> Server(Start a task to do this)

When publishing RTMP stream to NGINX, it will use HTTP callback to your Server, then you can start a asynchronouse task to detect the resolution and redirect the stream:

1. Detect the stream by FFmpeg or ffprobe.

ffprobe -v quiet -print_format json -show_streams rtmp://ip/app1/stream1

2. Redirect the stream to another application.

ffmpeg -f flv rtmp://ip/app1/stream1 -c copy -f flv rtmp://ip/app2/stream1