In addition, for streaming applications used by broadcasters, there are professional encoding tools such as mpegable broadcaster from German vendor dicas digital image coding, which is a real-time encoder for MPEG-4 multicast streaming. See Figure 1.
MPEG-4 video coding is extremely flexible. It can be used for low, intermediate and high bit rates, which is a great advantage compared to other video standards. Further, MPEG-4 offers two interesting functionalities: robustness in error-prone environments and content-based scalability. These built-in functionalities allow MPEG-4 encoded data to be accessible over a wide range of media and with various qualities in terms of temporal and spatial resolutions.
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MPEG-4 covers a wide range of applications, bit rates, resolutions, qualities and services, making it an interesting format for media delivery over different types of transmission or storage technologies. Back to the top. MPEG-4 provides the most efficient and highest quality audio coding available today.
MPEG-4 Coding of audio-visual objects Presentation By: Ihab Ilyas. - ppt download
MPEG-4 audio is inherently scalable. If, for example, a transmission uses an error-prone channel with limited bandwidth, an audio stream consisting of a small base layer and a larger extension layer provides a robust solution. Strong error protection on the base layer adding only little overhead to the overall bit rate makes sure there is always a signal, even with difficult reception.
The extension layer with little error protection and base layer together give excellent quality in normal conditions.
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Any errors lead only to a subtle degradation of quality but never in a total interruption of the audio stream. The result is a backward-compatible extension of the standard that nearly doubles the efficiency of MPEG-4 audio. See Figure 2. SBR is a unique bandwidth extension technique that enables audio codecs to deliver the same listening experience at around half the bit rate. This level of efficiency is ideal for Internet content delivery and fundamentally enables new applications in the markets of mobile and digital broadcasting.
The unique capability of MPEG-4 aacPlus to achieve high-quality at low bit rates not only enhances existing markets, but also it enables new markets for digital audio. As operators look to enhance their services with more channels or with high-definition, the efficiency of MPEG-4 aacPlus gives them more options to either consolidate audio bandwidth to make room for more video or to layer more audio services such as multilingual and 5.
The momentum behind H.
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JVT and incorporate H. For a detailed list of features and comparisons between the various compression standards, see Table 1. MPEG-4 also introduces some new tools for users. These include:. One of the most significant capital costs in an entertainment system can be the cost of the compression decoder. With greater compression efficiency comes greater encoder and decoder complexity.
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All of this results in a higher silicon cost. However, recent advances in semiconductors have paved the way to roll out these revolutionary technologies by making a single-chip AVC decoder a reality. See Table 2.
MPEG-4 compression: A look at the benefits
These state-of-the-art video technologies such as adaptive control of advanced preprocessing filters, extensive video analysis and closed loop statistical multiplexing all contribute to approximately two-thirds of the compression efficiency of broadcast MPEG-2 systems deployed today. These results are finally dramatic enough to compel the industry to invest in new technology and take the next leap. There are significant challenges inherent in the adoption of new video technologies. Adopting a new technology is an individual decision that is based on customer, competitive, economic and even regulatory considerations.
Achieving end-to-end interoperability for MPEG-2 required years of effort with significant adaptations to equipment manufacturers. See Figure 3. Similar improvements may occur with newer technologies. Depending on the needs of the business, an existing MPEG-2 operator will likely employ a combination of these strategies. MPEG-4 AVC can enable new business models by allowing operators to offer video services where previously they could not, or by packing more video channels into scarce and expensive transmission channels.
As new applications for MPEG-4 technology are developed, expect to see wider adoption of the solution and products.
Engineers and technical managers need not fear that compression technologies such as MPEG-4 are dead-end roads that may limit even further enhancements. Rather, the versatile platform that MPEG-4 provides ensures a long life for products and, if needed, future transitions to more applications and solutions. Home Back to the top Write us.