I am trying to write an H264 image decoder to take in ros messages in the form of compressed images from ROS. However, the decoder is unable to create the instance of the NvMediaImageDecoder with the stream from ROS. after checking the sensor_msg from ROS, I noticed the first 16 bytes of the message remains unchanged. are there any possible reasons why the callback cbBeginSequence is not getting called after parsing the data? the same set of messages can be decoded and viewed with an OpenCV decoder, hence the information from the bitstream does not seem to be invalid. Appreciate any help/advice!