Device and method for generating a transmit frame

Abstract

An apparatus for generating a transmit frame from an information signal, the information signal comprising a first information frame and a second information frame, comprises a provider (105) for providing a first reconstruction distortion value indicating a reconstruction distortion when replacing the first information frame by a replacement frame, and for providing a second reconstruction distortion value indicating a reconstruction distortion when replacing the second information frame by a replacement frame, means (107) for introducing either the first information frame or the second information frame into the transmit frame in dependence on the first reconstruction distortion value or in dependence on the second reconstruction value. In accordance with the present invention, a rate-di3tortion optimized rate reduction can be achieved.

Description

technical field [0001] The present invention belongs to the field of communications, and in particular to the field of signal transmission over a communications network such as the Internet. Background technique [0002] Video streaming on the Internet - or any other type of network where resources are shared by many users - has always faced the problem that at one or more points along the path, the input rate at a network node may be higher than the output rate. This leads to an ever-increasing buffer fullness of the node and eventually to packet loss. For video signals, if more traffic arrivals than the output link can be supported, the video data must be transcoded to a lower rate, or video packets must be dropped. [0003] Transcoding is computationally expensive and random dropping has a negative impact on video quality. Scalable video provides the opportunity to drop less important parts of the video bitstream first, which results in a modest degradation as traffic g...

AI Technical Summary

Problems solved by technology

[0002] Video streaming over the Internet - or any other type of network where resources are shared by many users - has always faced the problem that at one or more points along the path, the network The input rate at the node may be higher than the output rate

However, this drop decision does not take into account many simultaneous video streams in a rate-distortion optimal manner, so that certain video streams suffer from much higher distortion than others

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