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Phil Hippensteel

Phil Hippensteel on The Effect of Network Packet Loss

In our last newsletter, we investigated the effect of network latency on IP video. We found that if latency was high, video transported with TCP might pause but would show no other signs of deterioration. On the other hand, when UDP was used as the transport protocol, buffers in the network or at the receiver might empty causing the video to pause. Or, buffers in the network could overfill,......

Phil Hippensteel on The Effect of Network Delay

In our last newsletter, we discussed the important differences that result from using TCP (Transmission Control Protocol) rather than UDP (User Datagram Protocol) as the transport protocol for IP video.  You will recall that TCP guarantees delivery, adapts automatically to network conditions, and adapts to competing traffic levels.  On the other hand, UDP simply sends packets as fast as the......

Phil Hippensteel on Comparing Video Transport Methods: TCP vs. UDP

One of the more challenging issues related to transporting video over IP networks is understanding the difference between the two transport protocols:  TCP (Transmission Control Protocol) and UDP (User Datagram Protocol).  While the difference is often overlooked, the choice between these two protocols very much determines how the video application will react to the quality, architecture and......

Phil Hippensteel on Video Codecs

In the AV industry, there are many interpretations of the term codec. We’re going to discuss video codecs in this, our fourth newsletter.  However, most systems we call a codec share some common characteristics.They can be based on hardware, software or a combination of both.Their principal purpose is to prepare an audio or video signal for transport across a circuit or link that is outside......

Phil Hippensteel on MPEG Compression and MPEG Transport

Our focus in this newsletter will be on two terms that are often confused: mpeg compression and  mpeg-2 transport stream.   The first is a series of techniques which are used to compress video in efficient manner without significantly degrading the quality of the output to the display device.   The second is a format for laying out the compressed video data to provide efficient transport across......


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