Update app.py

app.py

@@ -148,14 +148,14 @@ async def generate_video_api(source_image: UploadFile = File(...), driven_audio:
     with open(temp_source_image_path, "wb") as buffer:
         shutil.copyfileobj(source_image.file, buffer)
 
-    if driven_audio:
+    if driven_audio is not None:
         temp_driven_audio_path = f"temp/{driven_audio.filename}"
         with open(temp_driven_audio_path, "wb") as buffer:
             shutil.copyfileobj(driven_audio.file, buffer)
     else:
         temp_driven_audio_path = None
 
-    if ref_video:
+    if ref_video is not None:
         temp_ref_video_path = f"temp/{ref_video.filename}"
         with open(temp_ref_video_path, "wb") as buffer:
             shutil.copyfileobj(ref_video.file, buffer)