feat: update video cut and extract head image job

backend/pkg/utils/md5.go

@@ -31,3 +31,12 @@ func GetFileMd5(file string) (string, error) {
 
 	return fmt.Sprintf("%x", h.Sum(nil)), nil
 }
+
+// GetFileSize
+func GetFileSize(file string) (int64, error) {
+	fi, err := os.Stat(file)
+	if err != nil {
+		return 0, err
+	}
+	return fi.Size(), nil
+}