feat: Add GPU-accelerated FFmpeg command execution and refactor command handling

app.py

@@ -1,4 +1,5 @@
 import gradio as gr
+import spaces
 
 from PIL import Image
 from moviepy.editor import VideoFileClip, AudioFileClip
@@ -215,6 +216,17 @@ YOUR RESPONSE:
         raise Exception("API Error")
 
 
+@spaces.GPU(duration=120)
+def execute_ffmpeg_command(args, temp_dir, output_file_path):
+    """Execute FFmpeg command with GPU acceleration"""
+    final_command = args + ["-y", output_file_path]
+    print(
+        f"\n=== EXECUTING FFMPEG COMMAND ===\nffmpeg {' '.join(final_command[1:])}\n"
+    )
+    subprocess.run(final_command, cwd=temp_dir)
+    return output_file_path
+
+
 def update(
     files,
     prompt,
@@ -276,11 +288,7 @@ def update(
 
             output_file_name = f"output_{uuid.uuid4()}.mp4"
             output_file_path = str((Path(temp_dir) / output_file_name).resolve())
-            final_command = args + ["-y", output_file_path]
-            print(
-                f"\n=== EXECUTING FFMPEG COMMAND ===\nffmpeg {' '.join(final_command[1:])}\n"
-            )
-            subprocess.run(final_command, cwd=temp_dir)
+            execute_ffmpeg_command(args, temp_dir, output_file_path)
             # Extract just the command for display
             command_for_display = f"ffmpeg {' '.join(args[1:])} -y output.mp4"
             generated_command = f"### Generated Command\n```bash\n{command_for_display}\n```"