fix mp4 compatibility issues

fish_api/app/prestart_fresh.py

@@ -1,10 +1,12 @@
 """启动前清空状态：SQLite、watch 旧 JSON、测量/行为运行时目录。
 
 由 start_fresh.sh 在 uvicorn 之前调用，使 FishMeasure 与 FishAction 均在无缓存下重新推理。
+可通过环境变量 KEEP_MEASURE_OUTPUT=1 保留测量输出目录以复用点云。
 """
 
 from __future__ import annotations
 
+import os
 from pathlib import Path
 
 from app.db import clear_runtime_compute_dirs, remove_sqlite_database_files
@@ -31,14 +33,30 @@ def run_prestart_fresh() -> None:
         flush=True,
     )
 
-    clear_runtime_compute_dirs(s)
-    print(
-        "[prestart-fresh] cleared compute dirs: "
-        f"measure_output={s.measure_output_root}, "
-        f"action_output={s.action_output_root}, "
-        f"media={s.media_root}, stream_tmp={s.stream_tmp_dir}",
-        flush=True,
-    )
+    # 检查是否保留测量输出目录（用于复用点云）
+    keep_measure_output = os.environ.get("KEEP_MEASURE_OUTPUT", "").strip() in ("1", "true", "yes")
+
+    if keep_measure_output:
+        # 只清理其他目录，保留 measure_output_root
+        from app.db import _safe_rm_tree
+        _safe_rm_tree(s.action_output_root)
+        _safe_rm_tree(s.media_root)
+        _safe_rm_tree(s.stream_tmp_dir)
+        print(
+            "[prestart-fresh] cleared compute dirs (kept measure_output for cloud reuse): "
+            f"action_output={s.action_output_root}, "
+            f"media={s.media_root}, stream_tmp={s.stream_tmp_dir}",
+            flush=True,
+        )
+    else:
+        clear_runtime_compute_dirs(s)
+        print(
+            "[prestart-fresh] cleared compute dirs: "
+            f"measure_output={s.measure_output_root}, "
+            f"action_output={s.action_output_root}, "
+            f"media={s.media_root}, stream_tmp={s.stream_tmp_dir}",
+            flush=True,
+        )
 
     if s.measure_watch_use_state_file:
         if s.measure_watch_state_file is not None: