fix: Updates --prepend_frames logic

inference_cli.py

@@ -130,8 +130,10 @@ def extract_frames_from_video(video_path, skip_first_frames=0, load_cap=None, pr
 
     # preprend frames if requested (reverse of the first few frames)
     if prepend_frames > 0:
-        prepend_frames = min(prepend_frames, len(frames))
-        frames = frames[-prepend_frames:] + frames
+        start_frames = []
+        if prepend_frames >= len(frames):  # repeat first (=last) frame
+            start_frames = [frames[-1]] * (prepend_frames - len(frames) + 1)
+        frames = start_frames + frames[prepend_frames:0:-1] + frames
 
     # Convert to tensor [T, H, W, C] and cast to Float16 for ComfyUI compatibility
     frames_tensor = torch.from_numpy(np.stack(frames)).to(torch.float16)