2026-05-28 prompt-template audit: align to authoritative source

metadata.json

@@ -10,7 +10,7 @@
         "single_video_start"
       ],
       "task_type": "multiple_choice_vqa",
-      "prompt_template": "<video>{{ question }}",
+      "prompt_template": "<video>{{ question }}\nPlease directly give the best option:",
       "mapping_from_source": {
         "media": {
           "from": "video_path",
@@ -57,7 +57,7 @@
         "single_video_start"
       ],
       "task_type": "vqa",
-      "prompt_template": "<video>{{ question }}",
+      "prompt_template": "<video>{{ question }}\nPlease answer yes or no:",
       "mapping_from_source": {
         "media": {
           "from": "video_path",
@@ -104,7 +104,7 @@
         "single_video_start"
       ],
       "task_type": "multiple_choice_vqa",
-      "prompt_template": "<video>{{ question }}",
+      "prompt_template": "<video>{{ question }}\nPlease directly give the best option:",
       "mapping_from_source": {
         "media": {
           "from": "video_path",