If on your Google, you say: Ok Google, stream , does it work? I followed the step, I can see the cameras in Google Home but I get the error.
Which log did you check?
Thanks
I checked the HA log and there were error messages there. But I donât have them anymore so I cannot paste them here 
Sure the streams work using the Google. But it takes time to load and the quality could be better. Hopefully can be tuned with some settings laterâŚ
Do you remember if the camera was trying to play the m3u8 file? It looks like my log file says: playing m3u8
2020-12-02 15:26:05 INFO (MainThread) [homeassistant.components.stream] Started stream: http://10.X.X.X:81/h264/Back/temp.m3u8
Tell me, if you input the stream_source url in Chrome, does it play? Mine download a 1kb file that I cannot open
Sorry for the delay, busy days⌠Yes, the stream shows up and runs without a problem. Moreover, I am able to cast the original camera streams to the chromecasts now. I dunno why. Maybe because I set the Internal URL in HA to be the same as the external one. I donât want to mess with it anymore since it works now.
iâm using the following code
- service: media_player.play_media
data:
entity_id: media_player.tv
media_content_id: http://<BlueIris_IP>/mjpg/garagefront/video.mjpg
media_content_type: image/jpg
and this is the resault
my problem is the caption âPlaying Default Media Recieverâ never disapear 
iâm using chromecast 4
please help
3 years later, same thing? The stream component buffers on my Nest Hub?
What are you casting to here? Chromecast? What format? H264? I know an old thread but really interested in how to cast RTSP streams to my chromecast.