Update app.py

app.py

@@ -36,7 +36,13 @@ def convert_video(input_file, output_file, codec='mp4v'):
         # Process and write audio stream using ffmpeg
         stream = ffmpeg.input(input_path)
         stream = ffmpeg.output(stream, output_path, acodec='aac', vcodec=codec, strict='experimental', loglevel='error')
-        ffmpeg.run(stream)
+        # Run FFmpeg command and capture stderr output
+        try:
+            ffmpeg.run(stream, capture_stderr=True)
+        except subprocess.CalledProcessError as e:
+            # Print stderr output if an error occurs
+            print(f"FFmpeg error: {e.stderr.decode()}")
+            raise e
 
         print(f"Video converted successfully: {output_path}")