Warning: Couldn't write data to device about sysdvr

Yep, that worked. A lot of thanks to you for writing this program. Closing issue.

[exelix11]

does normal mpv streaming work ? What is the command you're using to launch mpv ?
Vlc is known to have issues because frame timestamps are not implemented yet

Cheers for the quick response; MPV does not work.

I am just using USBStreamGUI and streaming to MPV, MPV in general works fine.

[exelix11]

Mh... then it sounds like it's some driver issue, could you try installing from the previous version of zadig ? An user on discord had a similar issue and solved like that.
Also try with a different usb cable.
If none of these work enable logging and post the log of the first few attempts, (it's usually long you may want to save it to a file and then upload somewhere like pastebin).

@exelix11 Hey, tried a fresh cable and an older version of zadig. No luck. Here's the pastebin. https://pastebin.com/eHjK0u8K

[exelix11]

Mh... logs seem alright, looks like the console is not answering back. Are you in a game that supports video recording ? You can test by long-pressing the screenshot button.
For it to work you have to be in a game, applets like the home menu, album and so on are not supported.