Generic Camera - Unknown error occurred

Hi,

i have installed SpyNet Camera on an old android phone, and i am trying to configure HA to access the video feed. There are two integrations that would seem to be appropriate: Generic Camera and MJPEG IP Camera. The second one works fine but the quality is not very good and there is no audio, so i wanted to try the Generic Camera one which use RTSP. I validated that my camera can be accessed through RTSP by using other clients which all worked perfectly fine, but when I try to set up the Generic Camera integration, I put all the same informations and only get an “Unknown error occurred” which isn’t very helpful. I tried checking and unchecking basically every other options but with no success.
The other test i did was setting up the integration with a still image only, which works but is not very useful either.

Any idea on what I could do?