title: Stream rtsp video from opencv in python in h.264 with low latency
body: <p>I'm quite new to video streaming and opencv in general.
  I wanted to stream my computations to another device via rtsp from a raspberry pi 3 using h264.
  I tried writing to a pipe using popen with ffmpeg to a ffserver anf with vlc creating rtsp servers to stream the content. Unfortunately I have huge lag in the stream, the best I could do was go down to 3 seconds.</p>
  
  <p>Is there any way to achieve this? I'm open to consider other technologies.</p>
  
  <p>Thank you</p>