How to stream an updating images sequence to rtmp server(youtube) with ffmpeg?

Question

Want to stream an image sequence generated by blender to Youtube rtmp server.

Currently using the following command to do so:

ffmpeg -r 24 -f image2 -s 1080x1920 -i /root/sandbox/new/render%04d.png -vcodec libx264 -crf 25 -pix_fmt yuv420p -f flv rtmp://a.rtmp.youtube.com/live2/******"

but this ends up only streaming the pre rendered images.

are there any arguments available so that the stream doesn't ends and while the frames are being rendered by blender and ffmpeg keeps on stacking and broadcasting the images ?