补

core/backend/apps/ai/creation.py

@@ -150,7 +150,8 @@ def _sync_segmented_video_message(message: CreationMessage) -> bool:
     """同步全能创作的多段出片。
 
     每段仍是普通 FREE_VIDEO 任务，故可沿用既有计费、轮询和资产落库；这里仅把它们聚合成
-    一张结果卡。所有分段完成后停在结果卡，绝不在此处触发 ffmpeg。
+    一张结果卡。任一片段先完成就先写回 GENERATING 卡供用户预览；所有分段完成后才转成
+    可合并的结果卡，绝不在此处触发 ffmpeg。
     """
     from .free_video import finalize_free_video
     from .models import AITask
@@ -189,16 +190,46 @@ def _sync_segmented_video_message(message: CreationMessage) -> bool:
         number = next((index + 1 for index, task in enumerate(refreshed) if task.id == failed.id), 1)
         fail_generating_message(message, f"第 {number} 段生成失败：{failed.error_message or '请重试'}")
         return True
+    assets: list[dict] = []
+    completed_segments = 0
+    for index, task in enumerate(refreshed, start=1):
+        if task.status != AITask.Status.SUCCEEDED:
+            continue
+        task_assets = _assets_from_task(task)
+        # 上游状态先成功、资产稍后才落库时，保留 GENERATING，下一轮再展示这段。
+        if not task_assets:
+            continue
+        completed_segments += 1
+        for asset in task_assets:
+            assets.append({**asset, "label": f"第 {index} 段", "segment_index": index})
+
+    # 先完成的片段必须立刻回到前端，不能等另一段慢任务一起完成才出现。
+    # 保持同一条 GENERATING 消息，避免把一个 60 秒视频拆成多条对话消息。
     if not all(task.status == AITask.Status.SUCCEEDED for task in refreshed):
+        progress = {
+            **payload,
+            "assets": assets,
+            "completed_segment_count": completed_segments,
+        }
+        if progress != payload:
+            message.payload = progress
+            message.save(update_fields=["payload", "updated_at"])
+            return True
+        return False
+
+    # 任务都成功但有片段的资产还在落库，继续保持生成中，避免最终结果缺片。
+    if completed_segments != len(refreshed):
+        progress = {
+            **payload,
+            "assets": assets,
+            "completed_segment_count": completed_segments,
+        }
+        if progress != payload:
+            message.payload = progress
+            message.save(update_fields=["payload", "updated_at"])
+            return True
         return False
 
-    assets: list[dict] = []
-    for index, task in enumerate(refreshed, start=1):
-        task_assets = _assets_from_task(task)
-        if not task_assets:
-            return False
-        for asset in task_assets:
-            assets.append({**asset, "label": f"第 {index} 段"})
     first = refreshed[0]
     finish_generating_message(
         message,