Constrained and general dynamic rate shaping of compressed digital video
ICIP '95 Proceedings of the 1995 International Conference on Image Processing (Vol. 3)-Volume 3 - Volume 3
Rate conversion of MPEG coded video by re-quantization process
ICIP '95 Proceedings of the 1995 International Conference on Image Processing (Vol. 3)-Volume 3 - Volume 3
Perfect requantization for video transcoding
Multimedia Tools and Applications
Digital Video Transcoding for Transmission and Storage
Digital Video Transcoding for Transmission and Storage
A multiple-window video embedding transcoder based on H.264/AVC standard
EURASIP Journal on Advances in Signal Processing
Requantization transcoding in pixel and frequency domain for intra 16x16 in H.264/AVC
ACIVS'06 Proceedings of the 8th international conference on Advanced Concepts For Intelligent Vision Systems
Requantization transcoding of H.264/AVC bitstreams for intra 4×4 prediction modes
PCM'06 Proceedings of the 7th Pacific Rim conference on Advances in Multimedia Information Processing
Rapid algorithms for MPEG-2 to h.264 transcoding
PCM'05 Proceedings of the 6th Pacific-Rim conference on Advances in Multimedia Information Processing - Volume Part II
Video transcoding: an overview of various techniques and research issues
IEEE Transactions on Multimedia
Dynamic rate shaping of compressed digital video
IEEE Transactions on Multimedia
Low-Complexity Heterogeneous Video Transcoding Using Data Mining
IEEE Transactions on Multimedia
Performance evaluation of transcoding algorithms for H.264
IEEE Transactions on Consumer Electronics
Requantization for transcoding of MPEG-2 intraframes
IEEE Transactions on Image Processing
A frequency-domain video transcoder for dynamic bit-rate reduction of MPEG-2 bit streams
IEEE Transactions on Circuits and Systems for Video Technology
Long-term memory motion-compensated prediction
IEEE Transactions on Circuits and Systems for Video Technology
Blocking artifact detection and reduction in compressed data
IEEE Transactions on Circuits and Systems for Video Technology
Overview of the H.264/AVC video coding standard
IEEE Transactions on Circuits and Systems for Video Technology
Motion- and aliasing-compensated prediction for hybrid video coding
IEEE Transactions on Circuits and Systems for Video Technology
Low-complexity transform and quantization in H.264/AVC
IEEE Transactions on Circuits and Systems for Video Technology
IEEE Transactions on Circuits and Systems for Video Technology
Overview of the Scalable Video Coding Extension of the H.264/AVC Standard
IEEE Transactions on Circuits and Systems for Video Technology
Annotation based personalized adaptation and presentation of videos for mobile applications
Multimedia Tools and Applications
Simple drift error-resilient H.264/AVC encoder for fast video transcoding using DCT coefficients
Computers & Mathematics with Applications
Hi-index | 0.00 |
In this paper, efficient solutions for requantization transcoding in H.264/AVC are presented. By requantizing residual coefficients in the bitstream, different error components can appear in the transcoded video stream. Firstly, a requantization error is present due to successive quantization in encoder and transcoder. In addition to the requantization error, the loss of information caused by coarser quantization will propagate due to dependencies in the bitstream. Because of the use of intra prediction and motion-compensated prediction in H.264/AVC, both spatial and temporal drift propagation arise in transcoded H.264/AVC video streams. The spatial drift in intra-predicted blocks results from mismatches in the surrounding prediction pixels as a consequence of requantization. In this paper, both spatial and temporal drift components are analyzed. As is shown, spatial drift has a determining impact on the visual quality of transcoded video streams in H.264/AVC. In particular, this type of drift results in serious distortion and disturbing artifacts in the transcoded video stream. In order to avoid the spatially propagating distortion, we introduce transcoding architectures based on spatial compensation techniques. By combining the individual temporal and spatial compensation approaches and applying different techniques based on the picture and/or macroblock type, overall architectures are obtained that provide a trade-off between computational complexity and rate-distortion performance. The complexity of the presented architectures is significantly reduced when compared to cascaded decoder-encoder solutions, which are typically used for H.264/AVC transcoding. The reduction in complexity is particularly large for the solution which uses spatial compensation only. When compared to traditional solutions without spatial compensation, both visual and objective quality results are highly improved.