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Windows users often suffer from missing VP8 or H.264 codecs. If your OS cannot encode the video, Doku cannot save it.
Verify the LED indicators on your recorder and ensure HDMI or BNC cables are firmly fastened Resolution Mismatch: Doku Video Rec Fixed
Visit the manufacturer's website. If your device turns on but won't record, download the latest firmware. Place the file on your SD card and follow the device's update instructions. This is a common fix for "Doku Video Rec" errors that appear after a few years of use. Windows users often suffer from missing VP8 or H