diff --git a/biz/ffmpeg.py b/biz/ffmpeg.py
index 2d57d5e..74fd90b 100644
--- a/biz/ffmpeg.py
+++ b/biz/ffmpeg.py
@@ -24,6 +24,13 @@ def parse_ffmpeg_task(task_info, template_info):
         span.set_attribute("task_params", task_params_str)
         task_params: dict = json.loads(task_params_str)
         task_params_orig = json.loads(task_params_str)
+        
+        # 统计only_if占位符的使用次数
+        only_if_usage_count = {}
+        for part in template_info.get("video_parts", []):
+            only_if = part.get('only_if', '')
+            if only_if:
+                only_if_usage_count[only_if] = only_if_usage_count.get(only_if, 0) + 1
         with tracer.start_as_current_span("parse_ffmpeg_task.download_all") as sub_span:
             with ThreadPoolExecutor(max_workers=8) as executor:
                 param_list: list[dict]
@@ -41,8 +48,9 @@ def parse_ffmpeg_task(task_info, template_info):
                 continue
             only_if = part.get('only_if', '')
             if only_if:
-                if not check_placeholder_exist(only_if, task_params_orig):
-                    logger.info("because only_if exist, placeholder: %s not exist, skip part: %s", only_if, part)
+                required_count = only_if_usage_count.get(only_if, 1)
+                if not check_placeholder_exist_with_count(only_if, task_params_orig, required_count):
+                    logger.info("because only_if exist, placeholder: %s insufficient (need %d), skip part: %s", only_if, required_count, part)
                     continue
             sub_ffmpeg_task = FfmpegTask(source)
             sub_ffmpeg_task.resolution = template_info.get("video_size", "")
@@ -114,6 +122,16 @@ def check_placeholder_exist(placeholder_id, task_params):
     return False
 
 
+def check_placeholder_exist_with_count(placeholder_id, task_params, required_count=1):
+    """检查占位符是否存在足够数量的片段"""
+    if placeholder_id in task_params:
+        new_sources = task_params.get(placeholder_id, [])
+        if type(new_sources) is list:
+            return len(new_sources) >= required_count
+        return required_count <= 1
+    return False
+
+
 def start_ffmpeg_task(ffmpeg_task):
     tracer = get_tracer(__name__)
     with tracer.start_as_current_span("start_ffmpeg_task") as span: