Video Streaming has surprising little overlap with Video Codecs. Once you choose input/output options, then there's little to change about the codec. The vast majority of options available to ffmpeg aren't supported in the browser. Streamers don't have options for precisely the same reason OP doesn't have options - you are limited entirely into what the browser supports.
I've built the exact pipeline OP has done - Video, over TCP, over Websockets, precisely because I had to deliver video to through a corporate firewall. Wolf, Moonlight and maybe even gstreamer just shows they didn't even try to understand what they were doing, and just threw every buzzword into an LLM.
To give you some perspective 40Mbps is an incredible amount of bandwidth. Blu ray is 40mbps. This video, in 8K on Youtube is 20Mbps: https://www.youtube.com/watch?v=1La4QzGeaaQ
I've built the exact pipeline OP has done - Video, over TCP, over Websockets, precisely because I had to deliver video to through a corporate firewall. Wolf, Moonlight and maybe even gstreamer just shows they didn't even try to understand what they were doing, and just threw every buzzword into an LLM.
To give you some perspective 40Mbps is an incredible amount of bandwidth. Blu ray is 40mbps. This video, in 8K on Youtube is 20Mbps: https://www.youtube.com/watch?v=1La4QzGeaaQ
There's really no explanation for this.