update Gradio version in requirements and fix indentation in transcribe function

app.py

@@ -51,11 +51,10 @@ def transcribe(audio, state=""):
 with gr.Blocks(title="Real-time Speech-to-Text with NeMo") as demo:
     gr.Markdown("# 🎙️ Real-time Speech-to-Text Transcription")
     gr.Markdown("Powered by NVIDIA NeMo and the parakeet-tdt-0.6b-v2 model")
-    
-    with gr.Row():
+      with gr.Row():
         with gr.Column(scale=2):
             audio_input = gr.Audio(
-                source="microphone", 
+                sources=["microphone"], 
                 type="numpy", 
                 streaming=True,
                 label="Speak into your microphone"

requirements.txt

@@ -1,5 +1,5 @@
 torch>=1.13.0
-gradio>=3.32.0
+gradio>=4.0.0
 nemo_toolkit[asr]>=1.18.0
 omegaconf>=2.2.0
 numpy>=1.22.0