I am very pleased that it work.
Did take some time to get it working and figure out how to do it.
it started a few weeks ago and installed the Xiaomi Fang camera at the front door with the fang hack.
I was able to sent a picture to the phone when the bell was pressed.
For the camera to work not only with the rtsp stream but also with image.jpg i needed a different hack.
Some french info about this one http://domo-attitude.fr/camera-xiaomi-xiaofang-flux-jpg-domoticz-jeedom/
But i did not want to look on the phone when watching the tv.
I already have a chrome cast on the Onkyo receiver and a LG tv.
I have created 3 flows to get it working.
1e one is just for the doorbell itself to send a picture
Here the picture is send.
I made (copied) a HTML page where image.jpg is refreshed every second or so and i stream this to the chrome cast.
<script type="text/javascript">
// <![CDATA[
var refreshrate = 1; // seconds between refresh
var image = "http://192.168.178.121/image.jpg"; // image name
var imgwidth = 1280; // image width
var imgheight = 720; // image height
var imgalt = "WebCam Image";
var imgtitle = "header=[WebCam Image] body=[WebCam Image Automatically Updated Every 30 Seconds] ";
function refresh() { document.images["pic"].src = image + "?" + new Date(); setTimeout('refresh()', refreshrate ); }
document.write('<img src="' + image + '" alt="' + imgalt + '" title="' + imgtitle + '" name="pic" id="pic" width="' + imgwidth + '" height="' + imgheight + '" style="border: none;" />');
if(document.images)window.onload=refresh;
// ]]>
</script>
And the flow for the camera to tv
Here is a video how it looks like