The transcoding of MPEG video streams is important in a variety of situations such as in rate reduction for small bandwidth downstream channels and in extracting a fast visual playback stream for digital video cassette recorders. This paper addresses transcoding of MPEG intra-coded frames

This paper presents an efficient transform-domain architecture and corresponding mode decision algorithms for transcoding intra-coded video from MPEG-2 to H.264/AVC. Low complexity is achieved in several ways. First, our architecture employs direct conversion of the transform coefficients, which

This paper presents a transrating (bit-rate reduction) algorithm for H.264 intra-coded frames via requantization. Previous works focused on adapting the input prediction modes to the lower bit rate and hence performed requantization using a one-pass algorithm. We propose a model-based algorithm

For video communication over a wireless ad hoc network, multiple paths with different rates are common. This paper considers the transmission of intra-coded video sequences through two bandwidth limited channels. More specifically, with the proposed framework a rate-distortion optimal summary

simulation results. The estimate is integrated into a rate-distortion (RD)-based framework for optimal switching between intra-coding and inter-coding modes per macroblock. The cost in computational complexity is modest. The framework is further extended to optimally exploit feedback

MPEG-4 provides technologies to view, access, and manipulate visualobjects rather than pixels with great error robustness at a large range of bitrates. It has very widespreading application domains. The MPEG-4 standard integrates natural and synthetic content in multimedia systems. 2D meshes

the real time. In our experiments, the algorithm detected 85-92 % of the faces in three test sets, including both intra-frame and inter-frame coded image frames from news video. The average run time ranges from 13 to 33 milliseconds per frame. The algorithm can be applied to JPEG unconstrained images

Abstract—The MPEG-4 standardization phase has the man-date to develop algorithms for audio-visual coding allowing for interactivity, high compression, and/or universal accessibility and portability of audio and video content. In addition to the conven-tional “frame”-based functionalities

that are distant from edges in the previous frame. A global motion computation is used to handle camera or object motion. The algorithm we propose withstands JPEG and MPEG artifacts, even at very high compression rates. Experimental evidence demonstrates that our method can detect and classify scene breaks

characteristics of video streams which are compressed based on the MPEG standard. Our study is based on 23 minutes of video obtained from an entertainment movie. A particular significance of our data is that it contains all types of coded frames, namely: Intra-coded (I), Prediction (P), and Bidirectional (B) MPEG