#5866 No CUDA detected. Check NVIDIA GPU/Drivers. See Help -> CUDA.

The error "No CUDA detected" means your system does not have a valid CUDA environment for GPU acceleration. This is most commonly caused by missing or misconfigured NVIDIA driver, CUDA Toolkit, or cuDNN.

Root cause: CUDA 12.8+ and cuDNN 9.11+ are required but not detected.

Steps to resolve (source deployment):

1. Ensure you have an NVIDIA GPU
   Open Command Prompt and run nvidia-smi. If it lists your GPU and driver version, the driver is fine. If not, update your NVIDIA driver from nvidia.com.

2. Install CUDA Toolkit 12.8
   Download and install from NVIDIA CUDA Toolkit. After installation, verify:

   nvcc -V

   It should output "release 12.8" or later.

3. Install cuDNN 9.11
   Download from NVIDIA cuDNN (requires free account). Follow the installation guide to copy files into CUDA's bin, include, lib directories.
4. Verify environment variables
   Ensure CUDA's bin and lib directories are in your system PATH. Restart the terminal/software after changes.
5. Re-run pyVideoTrans
   The "CUDA acceleration" checkbox in the GUI should now be available.

If the problem persists, please provide:

• Output of nvidia-smi and nvcc -V.
• The last 30 lines from logs/ folder.

Reference documentation:

• Windows CUDA configuration guide
• Install CUDA 12.6 and cuDNN 9.8 (similar steps for 12.8)