What can I do with this?

With the new Ultimate 64 firmware (>=1.1c) there is an option to receive video frames & audio over a network connection at 50fps.

You can use this tool to capture those frames into an image, audio or video file.

Changelog v1.24 (20/03/2021):

• ~ Fixed: CTRL+C image capture key, was not working anymore
• ~ Fixed: F1..F8 key assignment/remap
• ~ Fixed: NTSC scaling optimalisation
• ~ Fixed: Video frame processing optimalisation
• + Added: mouse actions on outputImage. left click=toggle menu, right click=settings
• + Added: U64 stream will be stopped when hitting “stop stream” button or closing app, if auto start/stop stream is enabled
• + Added: new image scale algorithms to make output quality better.
• + Added: screen resize / full screen function (PAL/NTSC), with realtime PAL/NTSC switching
• + Added: scan line simulation, use with default or scale algorithm, nearest neighbour can create unwanted artifacts (values:Disabled..20%)
• + Added: audio mute function
• + Added: audio volume slider
• + Added: menu position/visiblity optimalisation for different screen sizes/positions
• + Added: window size and position saving
• + Added: restore original size on double click on output window

Download: U64 Streamer v1.24 (618)

source: u64streamer