Fix frame sampling scheme.

app.py

@@ -163,7 +163,7 @@ def generate(image, video, state, state_, textbox_in, temperature, top_p, max_ou
         tensor.append(process_image(image, processor).to(handler.model.device, dtype=dtype))
         modals.append('IMAGE')
     if not os.path.exists(image) and os.path.exists(video):
-        tensor.append(process_video(video, processor, num_frames=num_frames, sample_scheme='fps').to(handler.model.device, dtype=dtype))
+        tensor.append(process_video(video, processor, num_frames=num_frames, sample_scheme='uniform').to(handler.model.device, dtype=dtype))
         modals.append('VIDEO')
     if os.path.exists(image) and os.path.exists(video):
         raise NotImplementedError("Not support image and video at the same time")