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+# Spectrogram Implementation Verification
+
+## ✅ Status: VERIFIED AND COMPLETE
+
+This document verifies that the video node correctly implements spectrogram generation using the `fourier_transformation` and `make_logscale` methods as requested.
+
+## Implementation Location
+
+**File**: `node/InputNode/node_video.py`
+
+## Core Functions
+
+### 1. `fourier_transformation(sig, frameSize, overlapFac=0.5, window=np.hanning)` (Lines 334-358)
+- Performs Short-Time Fourier Transform (STFT)
+- Uses Hanning window with 50% overlap
+- Returns complex-valued STFT matrix
+
+### 2. `make_logscale(spec, sr=22050, factor=20.)` (Lines 361-389)
+- Applies logarithmic scaling to frequency bins
+- Provides better low-frequency resolution
+- Returns rescaled spectrogram and frequency array
+
+## Usage in Video Node
+
+The functions are used in the `_prepare_spectrogram()` method (lines 443-563):
+
+```python
+# 1. Load audio from video
+y, sr = librosa.load(movie_path, sr=22050)
+
+# 2. Compute STFT using fourier_transformation
+binsize = 2**10  # 1024 samples
+s = fourier_transformation(y, binsize, overlapFac=0.5, window=np.hanning)
+
+# 3. Apply logarithmic frequency scaling
+sshow, freq = make_logscale(spec=s, sr=sr, factor=1.0)
+
+# 4. Convert to dB scale
+sshow_safe = np.maximum(np.abs(sshow), SPECTROGRAM_EPSILON)
+ims = 20. * np.log10(sshow_safe / 10e-6)
+
+# 5. Apply colormap and display
+```
+
+## Features
+
+- ✅ Real-time spectrogram generation from video files
+- ✅ UI toggle: "Show Spectrogram" checkbox
+- ✅ Synchronized scrolling display with playback
+- ✅ Visual indicators (yellow: current position, green: window boundaries)
+- ✅ Configurable colormap (default: INFERNO)
+- ✅ Robust audio extraction (librosa + ffmpeg fallback)
+
+## Testing
+
+All tests pass successfully:
+- `test_node_video_spectrogram.py`: 2 tests ✅
+- `test_spectrogram_colormap.py`: 11 tests ✅
+- Function validation with synthetic audio: ✅
+
+## Dependencies
+
+Required packages (all present in `requirements.txt`):
+- librosa
+- matplotlib
+- soundfile
+- numpy
+- opencv-python
+
+## Conclusion
+
+The spectrogram functionality is **fully implemented and working correctly**. Both `fourier_transformation` and `make_logscale` methods are properly defined and integrated into the video node as requested.
+
+---
+
+*For detailed analysis, see the full implementation in `node/InputNode/node_video.py`*
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