Updated app to fix file validation and progress updates

Dockerfile.txt

@@ -0,0 +1,19 @@
+FROM python:3.10
+
+# Install system dependencies (FFmpeg for video processing)
+RUN apt-get update && apt-get install -y ffmpeg && rm -rf /var/lib/apt/lists/*
+
+# Set working directory
+WORKDIR /app
+
+# Copy requirements file
+COPY requirements.txt .
+
+# Install Python dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application code
+COPY . .
+
+# Launch the app
+CMD ["python", "app.py"]