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When a Codec sends out a video frame, it initially will transmit frames described as I frames (reference frames). The I Frame contains the complete information needed to display a picture. To save on bandwidth, a technique is used where the subsequent video packets sent after the I Frame are just updates to the initial picture instead of continuously transmitting the I frames. These updates which are labeled P Frames are sent to minimize the amount of video data that need to be transmitted from one video system to another. Occasionally the P Frames become corrupted through different issues such as packet loss, jitter, or too much information. At this point the far end receiving the video would request a Video Fast Update request. The VFU requests that a complete new I Frame be sent with the full reference frame of video information. Once the new I-Frame is sent, any subsequent packets sent after the updated I Frame will be P-Frames. The VFU feature is always running on the IMG 2020 and cannot be disabled.
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