Coordinate transformation after storing all tf messages from a rosbag

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Hi, After storing all tf messages in a list from a rosbag file, I am trying to do coordinate transformations at specific times in a loop. I have target times for the transformations to occur and I assume that transform function picks a closest tf message at each target time. But, the output doesn't look correct. Can someone please help me how to fix the code below?

rosbag_file = rosbag.Bag(rosbag_dir, 'r')
static_transform_list = []
for topic, msg, t in rosbag_file.read_messages(topics=['/tf_static']):
    for static_transform in msg.transforms:
        static_transform_list.append(static_transform)
transform_list = []
for topic, msg, t in rosbag_file.read_messages(topics=['/tf']):
    for transform in msg.transforms:
        transform_list.append(transform)
tf2_transformer = tf2_ros.Buffer()
for static_transform in static_transform_list:
    tf2_transformer.set_transform_static(static_transform, '')
for transform in transform_list:
    tf2_transformer.set_transform(transform, '')
for frame_t, p in enumerate(frame_t_list):
    pmsg = geometry_msgs.msg.PointStamped()
    pmsg.header.frame_id = 'base'
    pmsg.header.stamp = rospy.Time.from_sec(frame_t)
    pmsg.point.x = p[0]
    pmsg.point.y = p[1]
    pmsg.point.z = p[2]
    pmsg_world = tf2_transformer.transform(pmsg, target_frame='world')