How can I use ffmpeg to stream video to an RTMP server?

To stream video to an RTMP server using ffmpeg, you can use the following command:

ffmpeg -i input video file -c:v libx264 -preset veryfast -tune zerolatency -f flv rtmp://RTMP server address/stream key

This command will encode the video using the libx264 codec with veryfast preset and zerolatency tuning, and then stream it to the specified RTMP server address with the given stream key.