优化首帧功能，如果没传入首帧，则提取首帧。

wechat_ipad/client/message.py

@@ -15,7 +15,7 @@ from pymediainfo import MediaInfo
 import pysilk
 from pydub import AudioSegment
 
-from utils.video_utils import _get_first_frame
+from utils.video_utils import _get_first_frame, _get_first_frame_bytes
 from wechat_ipad import UserLoggedOut
 from wechat_ipad.client.base import WechatAPIClientBase
 
@@ -231,6 +231,11 @@ class MessageMixin(WechatAPIClientBase):
             vid_base64 = base64.b64encode(video).decode()
             file_len = len(video)
             media_info = MediaInfo.parse(BytesIO(video))
+            # 如果没有传入首帧，则自己提取一次
+            if not has_image:
+                first_frame = _get_first_frame_bytes(video, f"frame_{int(time.time())}.jpg")
+                if first_frame:
+                    image = first_frame
         elif isinstance(video, os.PathLike):
             video_path = Path(video)
             if not video_path.exists():
@@ -242,7 +247,7 @@ class MessageMixin(WechatAPIClientBase):
             media_info = MediaInfo.parse(video_path)
             # 如果没有传入首帧，则自己提取一次
             if not has_image:
-                first_frame = _get_first_frame(video_path, f"dify_frame_{int(time.time())}.jpg")
+                first_frame = _get_first_frame(video_path, f"frame_{int(time.time())}.jpg")
                 if first_frame:
                     image = first_frame
         else: