All Dreamcast games footage is captured from native game play.
The Dreamcast doesn’t output via HDMI natively so in this set up a HDMI adapteris used. The system is set to output at 480p and then using the mClassic HDMI add-on to upscale upto 1080p, the retro mode is also enabled to retain 4:3 aspect ratio so the image is not altered. You can see in the comparison videos the difference mClassic makes for these older Dreamcast games.