I don't think it's possible but does anyone know if you can use a rtsp url for the main stream and a rtmp stream for the sub on the same camera?
I have a reolink (yes I know the issues) and if I use both rtsp streams the camera frame and keyframe rates are unstable (https://streamable.com/dma7po)
If I use the rtsp sub stream alone it's unstable (https://streamable.com/2cn3d2)
However if I use only the rtsp main stream my keyframe rate seems to be a stable 1.00 (https://streamable.com/gdd9p9), if I use the rtmp streams (sub and ext) it seems stable (https://streamable.com/el88xp)