Transrating by frequencies selectivity for H.264/AVC intra pictures

Abstract

This paper presents the results obtained in the framework of the first part of the French ANR TOSCANE project. This project aims at developing efficient solutions for adaptation of video contents to be delivered over audiovisual networks. We present here a complete transrating scheme for incoming H.264/AVC compressed video bitstreams. The proposed solution is based on frequency selective filtering and has the main advantage to be drift-error free. Experimental results show that the algorithm gives satisfying results in terms of visual quality compared to conventional transrating methods. It has been validated using the JM reference software and then implemented into a dedicated FPGA architecture. The use of the scalable extension of the H.264/AVC standard is finally considered as the following part of the project.

Modeling and FPGA implementation of reconfigurable transcoder for real time video adaptation

“…This part is thus placed in a reconfigurable area and is configured or reconfigured on demand. It includes several methods to adapt the video stream, among which there is the requantization of each block value and the frequency selection [7] acting on the quality of frames. These two methods are used in order to decrease the bitrate at the transcoder output to be adapted to the available bandwidth.…”

Extending Coverage of High Definition TV Services over ADSL2 with Optimized Reception Quality using H.264/AVC Transrating

“…Several novelties have been introduced in the proposed solution compared to the one described in [5], which was based on the MPEG2 standard: first, the new H.264/AVC video coding tools such as intra prediction or more efficient context-adaptive variable length coding algorithms should be carefully taken into account. Consequently it leads us to develop a new H.264/AVC transrating scheme already presented in [9,10] which is proving to be more complex to implement than in the MPEG-2 case. Moreover, the transrating algorithm has been developed with respects to low complexity constraints as it must be integrated directly into the central office in the context of high-definition video delivery scenarios, and a new rate-distortion modeling of the transrating performances has been proposed.…”

Extension of the DSL coverage area for High Definition IPTV VOD services using H.264 Scalable Video Coding

“…In [4], the detailed performances of this transrater are presented for intra frames, in comparison with quality optimal technique named Full decode/ Full re-encode.…”

“…Obviously, the eligibility of a consumer to HD VOD services is also directly related to the QoS criterion which is determined by the provider. We choose a classical Quasi-Error-Free (QEF) criterion such [3][4]. The transrater in [3] is based on a selective removal of frequency coefficients into inter frames.…”