Hierarchical modulation. Hierarchical modulation, also called layered modulation, is one of the signal processing techniques for multiplexing and modulating multiple data streams into one single symbol stream, where base-layer symbols and enhancement-layer symbols are synchronously overplayed before transmission. Hierarchical modulation is particularly used to mitigate the cliff effect in digital television broadcast, particularly mobile TV, by providing a (lower quality) fallback signal in case of weak signals, allowing graceful degradation instead of complete signal loss. It has been widely proven and included in various standards, such as DVB-T, MediaFLO, UMB (Ultra Mobile Broadband, a new 3.5th generation mobile network standard developed by 3GPP2), and is under study for DVB-H. Hierarchical modulation is also taken as one of the practical implementations of superposition precoding, which can help achieve the maximum sum rate of broadcast channels.
Example[edit] Layered Modulation Constellation See also[edit] RFC 5168 - XML Schema for Media Control. [Docs] [txt|pdf] [draft-levin-mmusi...] [Diff1] [Diff2] INFORMATIONAL Network Working Group O. Levin Request for Comments: 5168 Microsoft Corporation Category: Informational R. Even Polycom P. Hagendorf RADVISION March 2008 Status of This Memo This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited. RFC 5168 Media Control March 2008 Table of Contents 1. 1. This document defines an Extensible Markup Language (XML) Schema for video fast update request in a tightly controlled environment, developed by Microsoft, Polycom, Radvision and used by multiple vendors. 2.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [2]. RFC 5168 Media Control March 2008 3. 4. Output of a video codec is a frame. 5. <? RFC 5168 Media Control March 2008 </xs:schema> 6. 7. 7.1. Ip.hhi.de/imagecom_G1/assets/pdfs/csvt_overview_0305.pdf. MPEG-4 AVC. H.264/MPEG-4 Part 10 or AVC (Advanced Video Coding) is a video compression format, and is currently one of the most commonly used formats for the recording, compression, and distribution of video content.
The final drafting work on the first version of the standard was completed in May 2003. H.264/MPEG-4 AVC is a block-oriented motion-compensation-based video compression standard developed by the ITU-T Video Coding Experts Group (VCEG) together with the ISO/IEC JTC1 Moving Picture Experts Group (MPEG). The project partnership effort is known as the Joint Video Team (JVT). The ITU-T H.264 standard and the ISO/IEC MPEG-4 AVC standard (formally, ISO/IEC 14496-10 – MPEG-4 Part 10, Advanced Video Coding) are jointly maintained so that they have identical technical content. H.264 is perhaps best known as being one of the video encoding standards for Blu-ray Discs; all Blu-ray Disc players must be able to decode H.264. Overview[edit] Standardization committee and history[edit] Applications[edit] Home - theVideoUprising. Real World Video Compression - RWVC. Encoding Tips part 1 by Andy Beach.
Andy Beach is a digital media professional whose knowledge of video post-production, compression and interactive design has attracted clients such as: Microsoft, Major League Baseball, Apple, and Adobe. Andy has a book and a website devoted to Real World Video Compression, and he has done several webinars on video compression recently. I thought it would be a good topic to cover on this blog, so I asked Andy to share some of his encoding expertise with us on how to best set up and encode our screencast videos. So we start at the beginning… setting up a screen capture. by Andy Beach I recently started answering a few questions on my Real World Video Compression site by doing screen recordings showing the step-by-step instructions. To keep the ball rolling, I thought I’d answer those questions via video as well! 1) Start with a clean desktop – remove all the extraneous icons and dock from the screen, and close any.
RFC 5104 - Codec Control Messages in the RTP Audio-Visual Profile with Feedback (AVPF) [Docs] [txt|pdf] [draft-ietf-avt-av...] [Diff1] [Diff2] PROPOSED STANDARD Network Working Group S. Wenger Request for Comments: 5104 U. Chandra Category: Standards Track Nokia M. Westerlund B. Burman Ericsson February 2008 Status of This Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements.
RFC 5104 Codec Control Messages in AVPF February 2008 Table of Contents 1. RFC 5104 Codec Control Messages in AVPF February 2008 4.2.2.2. RFC 5104 Codec Control Messages in AVPF February 2008 1. When the Audio-Visual Profile with Feedback (AVPF) [RFC4585] was developed, the main emphasis lay in the efficient support of point- to-point and small multipoint scenarios without centralized multipoint control.
RFC 5104 Codec Control Messages in AVPF February 2008 2. 2.1. 2.2. Real World Video Compression - RWVC. H.264/MPEG-4 AVC. H.264 or MPEG-4 Part 10, Advanced Video Coding (MPEG-4 AVC) is a video coding format that is currently one of the most commonly used formats for the recording, compression, and distribution of video content. The final drafting work on the first version of the standard was completed in May 2003, and various extensions of its capabilities have been added in subsequent editions. H.264/MPEG-4 AVC is a block-oriented motion-compensation-based video compression standard developed by the ITU-T Video Coding Experts Group (VCEG) together with the ISO/IEC JTC1 Moving Picture Experts Group (MPEG).
The project partnership effort is known as the Joint Video Team (JVT). The ITU-T H.264 standard and the ISO/IEC MPEG-4 AVC standard (formally, ISO/IEC 14496-10 – MPEG-4 Part 10, Advanced Video Coding) are jointly maintained so that they have identical technical content. High Efficiency Video Coding (HEVC), a.k.a. Overview[edit] The next major feature added to the standard was Scalable Video Coding (SVC). Jointwave - Products. Products Since the inception, Jointwave has been focusing on video processing and codec IP design for ASIC and FPGA. All the IP cores are provided by subsequent parts: Synthesizable verilog source files Verilog testbenches Testing scripts (shell-script, tcl and perl) C-model source files Synthesizing scripts Design and implementation documents All the IP Cores are easy to be customized and easy to be integrated into SOC.
We provide comprehensive consultancy and technical support to help customers to evaluate and implement the H.264 encoder IP cores into large scale SOC. H.264 Real-time Main Profile Encoder IP Cores H.264 Real-time Baseline Profile Encoder IP Cores H.264 Real-time High Profile Encoder IP Cores (1) Frequency listed here is the lowest frequency required. Get a better video quality due to the enlarged searching area Synchronize with other parts of the same SOC (2) E4X0 occupies few logic gates than corresponding E5X0 encoder.
Key Feathers of H.264 Encoder IP Cores. H264 WebCam HomePage (Video Surveillance System which Support USB camera, Network Camera, Video Capture Card.) RFC 5506 - Support for Reduced-Size Real-Time Transport Control Protocol (RTCP): Opportunities and Consequences. Www.ietf.org/rfc/rfc3984.txt. RFC 6185 - RTP Payload Format for H.264 Reduced-Complexity Decoding Operation (RCDO) Video. MPEG-4. MPEG-4 is a method of defining compression of audio and visual (AV) digital data. It was introduced in late 1998 and designated a standard for a group of audio and video coding formats and related technology agreed upon by the ISO/IEC Moving Picture Experts Group (MPEG) (ISO/IEC JTC1/SC29/WG11) under the formal standard ISO/IEC 14496 – Coding of audio-visual objects.
Uses of MPEG-4 include compression of AV data for web (streaming media) and CD distribution, voice (telephone, videophone) and broadcast television applications. Background[edit] MPEG-4 is still an evolving standard and is divided into a number of parts. Most of the features included in MPEG-4 are left to individual developers to decide whether to implement them. Initially, MPEG-4 was aimed primarily at low bit-rate video communications; however, its scope as a multimedia coding standard was later expanded. Overview[edit] MPEG-4 provides a series of technologies for developers, for various service-providers and for end users:
WebM. WebM — открытый формат мультимедиа, представленный компанией Google на конференции Google I/O 19 мая 2010 года[2]. Формат не требует лицензионных отчислений, основан на открытых видеокодеке VP8, аудиокодеке Vorbis и подмножестве медиаконтейнера Matroska.[3] Новый формат вместе с VP8 призван заменить проприетарный стандарт H.264/MPEG-4. Поддержка формата уже осуществлена в браузерах Google Chrome, Mozilla Firefox и Opera. Также формат будет поддерживаться Internet Explorer 9 при установке нужных кодеков в Windows.[4]. Представитель компании Adobe Systems заявил, что WebM будет встроен в технологию Adobe Flash[5]. История[править | править исходный текст] В пятую версию языка HTML был добавлен специальный элемент для отображения видео. В качестве стандарта предлагалось использовать свободное ПО: видеокодек Theora, аудиокодек Vorbis и медиаконтейнер Ogg. Поддержка браузеров[править | править исходный текст] Финальные версии браузеров, в которых включена поддержка формата WebM: mkvmerge GUI.