if section_index < total_latent_sections - 3:

app.py

@@ -727,7 +727,7 @@ def worker_last_frame(input_image, prompts, n_prompt, seed, resolution, total_se
             )
 
             [total_generated_latent_frames, history_latents, history_pixels] = post_process(generated_latents, total_generated_latent_frames, history_latents, high_vram, transformer, gpu, vae, history_pixels, latent_window_size, enable_preview, section_index, total_latent_sections, outputs_folder, mp4_crf, stream)
-            if section_index < total_latent_sections - 2:
+            if section_index < total_latent_sections - 3:
                 break
     except:
         traceback.print_exc()