- Add `checkNvidiaGpuAvailable()` function using nvidia-smi to detect GPU presence
- Add comprehensive logging for hardware acceleration decisions:
- GPU detection status
- Hardware vs software encoding/decoding choices
- CUDA codec support detection
- Encoder selection decisions
- Cache GPU availability results to avoid repeated checks
- Add `resetNvidiaGpuCache()` for testing
- Update tests to handle GPU availability mocking
This provides visibility into hardware acceleration decisions and ensures CUDA is only attempted when NVIDIA GPU hardware is actually available.
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