Update Dockerfile

Dockerfile

@@ -16,6 +16,8 @@ WORKDIR /app
 # (Optional but nice) confirm Python/pip versions in build logs
 RUN python --version && pip --version
 
+RUN apt-get update && apt-get install -y ffmpeg && rm -rf /var/lib/apt/lists/*
+
 # CPU Torch for build/testing (GPU hardware on Space is still recommended for speed)
 RUN pip install --no-cache-dir torch==2.1.2 torchaudio==2.1.2 --index-url https://download.pytorch.org/whl/cpu