Troubleshooting
June 12, 2026 · View on GitHub
← Documentation · Building · Models
| Issue | What to check |
|---|---|
| «Cannot load DLL» | opencv_delphi_wrapper.dll and OpenCV DLLs in bin/ or PATH — Building |
| Camera won't open | --camera=N, --backend=dshow or msmf — DemoWebcam5 |
| FaceDetectorYN won't create | OpenCV built with dnn |
| Empty detect on webcam | 2026may model; setInputSize matches frame |
| YOLOX create/detect fail | path contains yolox; model in models\; custom postprocess |
| PPOCR 0 polygons | use text_sample.png, not test.png — PPOCR |
| PPOCR detect fail (Concat) | rebuild wrapper; setInputSize multiple of 32 |
EExternalException in tests | OpenCV 5 + Delphi host — SEH |
| DemoUtils not found | -N"path\samples\common" when compiling |
| DemoTrackNano5 | backbone.onnx + neckhead.onnx in bin/ — Models |
| BPL «compiled with a different version» | build_package.ps1 with same Studio; don't mix BPL/DCP — Packages |
| Components not on palette | OpenCV5.bpl + OpenCV5Design.bpl; Library path — Components |
| Pipeline INI without params | SaveToIni saves type and Enabled; params via OI — Pipeline |