Opus and Session Initiation Protocol Security in Voice Over IP (VOIP)
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Lossless Audio Codec Comparison
Contents Introduction 3 1 CD-audio test 4 1.1 CD's used . .4 1.2 Results all CD's together . .4 1.3 Interesting quirks . .7 1.3.1 Mono encoded as stereo (Dan Browns Angels and Demons) . .7 1.3.2 Compressibility . .9 1.4 Convergence of the results . 10 2 High-resolution audio 13 2.1 Nine Inch Nails' The Slip . 13 2.2 Howard Shore's soundtrack for The Lord of the Rings: The Return of the King . 16 2.3 Wasted bits . 18 3 Multichannel audio 20 3.1 Howard Shore's soundtrack for The Lord of the Rings: The Return of the King . 20 A Motivation for choosing these CDs 23 B Test setup 27 B.1 Scripting and graphing . 27 B.2 Codecs and parameters used . 27 B.3 MD5 checksumming . 28 C Revision history 30 Bibliography 31 2 Introduction While testing the efficiency of lossy codecs can be quite cumbersome (as results differ for each person), comparing lossless codecs is much easier. As the last well documented and comprehensive test available on the internet has been a few years ago, I thought it would be a good idea to update. Beside comparing with CD-audio (which is often done to assess codec performance) and spitting out a grand total, this comparison also looks at extremes that occurred during the test and takes a look at 'high-resolution audio' and multichannel/surround audio. While the comparison was made to update the comparison-page on the FLAC website, it aims to be fair and unbiased. -
Skype for Asterisk™ Administrator Manual
Skype for Asterisk™ Administrator Manual 601-00017 Rev. B2 Digium, Inc. 445 Jan Davis Drive NW Huntsville, AL 35806 United States Main Number: 1.256.428.6000 Tech Support: 1.256.428.6161 U.S. Toll Free: 1.877.344.4861 Sales: 1.256.428.6262 www.asterisk.org www.digium.com www.asterisknow.org © Digium®, Inc. 2010 All rights reserved. No part of this publication may be copied, distributed, transmitted, transcribed, stored in a retrieval system, or translated into any human or computer language without the prior written permission of Digium, Inc. Digium, Inc. has made every effort to ensure that the instructions contained in this document are adequate and error free. The manufacturer will, if necessary, explain issues that may not be covered by this documentation. The manufacturer’s liability for any errors in the documents is limited to the correction of errors and the aforementioned advisory services. This document has been prepared for use by professional and properly trained personnel, and the customer assumes full responsibility when using it. Adobe and Acrobat are registered trademarks, and Acrobat Reader is a trademark of Adobe Systems Incorporated. Asterisk, Digium, Switchvox, and AsteriskNOW are registered trademarks and Asterisk Business Edition, AsteriskGUI, and Asterisk Appliance are trademarks of Digium, Inc. Any other trademarks mentioned in the document are the property of their respective owners. Digium, Inc. Page 2 TABLE OF CONTENTS Chapter 1: Overview.................................................................................................................6 -
Download Media Player Codec Pack Version 4.1 Media Player Codec Pack
download media player codec pack version 4.1 Media Player Codec Pack. Description: In Microsoft Windows 10 it is not possible to set all file associations using an installer. Microsoft chose to block changes of file associations with the introduction of their Zune players. Third party codecs are also blocked in some instances, preventing some files from playing in the Zune players. A simple workaround for this problem is to switch playback of video and music files to Windows Media Player manually. In start menu click on the "Settings". In the "Windows Settings" window click on "System". On the "System" pane click on "Default apps". On the "Choose default applications" pane click on "Films & TV" under "Video Player". On the "Choose an application" pop up menu click on "Windows Media Player" to set Windows Media Player as the default player for video files. Footnote: The same method can be used to apply file associations for music, by simply clicking on "Groove Music" under "Media Player" instead of changing Video Player in step 4. Media Player Codec Pack Plus. Codec's Explained: A codec is a piece of software on either a device or computer capable of encoding and/or decoding video and/or audio data from files, streams and broadcasts. The word Codec is a portmanteau of ' co mpressor- dec ompressor' Compression types that you will be able to play include: x264 | x265 | h.265 | HEVC | 10bit x265 | 10bit x264 | AVCHD | AVC DivX | XviD | MP4 | MPEG4 | MPEG2 and many more. File types you will be able to play include: .bdmv | .evo | .hevc | .mkv | .avi | .flv | .webm | .mp4 | .m4v | .m4a | .ts | .ogm .ac3 | .dts | .alac | .flac | .ape | .aac | .ogg | .ofr | .mpc | .3gp and many more. -
Cluster-Based Delta Compression of a Collection of Files Department of Computer and Information Science
Cluster-Based Delta Compression of a Collection of Files Zan Ouyang Nasir Memon Torsten Suel Dimitre Trendafilov Department of Computer and Information Science Technical Report TR-CIS-2002-05 12/27/2002 Cluster-Based Delta Compression of a Collection of Files Zan Ouyang Nasir Memon Torsten Suel Dimitre Trendafilov CIS Department Polytechnic University Brooklyn, NY 11201 Abstract Delta compression techniques are commonly used to succinctly represent an updated ver- sion of a file with respect to an earlier one. In this paper, we study the use of delta compression in a somewhat different scenario, where we wish to compress a large collection of (more or less) related files by performing a sequence of pairwise delta compressions. The problem of finding an optimal delta encoding for a collection of files by taking pairwise deltas can be re- duced to the problem of computing a branching of maximum weight in a weighted directed graph, but this solution is inefficient and thus does not scale to larger file collections. This motivates us to propose a framework for cluster-based delta compression that uses text clus- tering techniques to prune the graph of possible pairwise delta encodings. To demonstrate the efficacy of our approach, we present experimental results on collections of web pages. Our experiments show that cluster-based delta compression of collections provides significant im- provements in compression ratio as compared to individually compressing each file or using tar+gzip, at a moderate cost in efficiency. A shorter version of this paper appears in the Proceedings of the 3rd International Con- ference on Web Information Systems Engineering (WISE), December 2002. -
C-Based Hardware Design of Imdct Accelerator for Ogg Vorbis Decoder
C-BASED HARDWARE DESIGN OF IMDCT ACCELERATOR FOR OGG VORBIS DECODER Shinichi Maeta1, Atsushi Kosaka1, Akihisa Yamada1, 2, Takao Onoye1, Tohru Chiba1, 2, and Isao Shirakawa1 1Department of Information Systems Engineering, 2Sharp Corporation Graduate School of Information Science and Technology, 2613-1 Ichinomoto, Tenri, Nara, 632-8567 Japan Osaka University phone: +81 743 65 2531, fax: +81 743 65 3963, 2-1 Yamada-oka, Suita, Osaka, 565-0871 Japan email: [email protected], phone: +81 6 6879 7808, fax: +81 6 6875 5902, [email protected] email: {maeta, kosaka, onoye, sirakawa}@ist.osaka-u.ac.jp ABSTRACT ARM7TDMI is used as the embedded processor since it has This paper presents hardware design of an IMDCT accelera- come into wide use recently. tor for an Ogg Vorbis decoder using a C-based design sys- tem. Low power implementation of audio codec is important 2. OGG VORBIS CODEC in order to achieve long battery life of portable audio de- 2.1 Ogg Vorbis Overview vices. Through the computational cost analysis of the whole decoding process, it is found that Ogg Vorbis requires higher Figure 1 shows a block diagram of the Ogg Vorbis codec operation frequency of an embedded processor than MPEG processes outlined below. Audio. In order to reduce the CPU load, an accelerator is designed as specific hardware for IMDCT, which is detected MDCT Psycho Audio Remove Channel Acoustic VQ as the most computation-intensive functional block. Real- Signal Floor Coupling time decoding of Ogg Vorbis is achieved with the accelera- FFT Model Ogg Vorbis tor and an embedded processor both run at 36MHz. -
Microsoft Powerpoint
Development of Multimedia WebApp on Tizen Platform 1. HTML Multimedia 2. Multimedia Playing with HTML5 Tags (1) HTML5 Video (2) HTML5 Audio (3) HTML Pulg-ins (4) HTML YouTube (5) Accessing Media Streams and Playing (6) Multimedia Contents Mgmt (7) Capturing Images 3. Multimedia Processing Web Device API Multimedia WepApp on Tizen - 1 - 1. HTML Multimedia • What is Multimedia ? − Multimedia comes in many different formats. It can be almost anything you can hear or see. − Examples : Pictures, music, sound, videos, records, films, animations, and more. − Web pages often contain multimedia elements of different types and formats. • Multimedia Formats − Multimedia elements (like sounds or videos) are stored in media files. − The most common way to discover the type of a file, is to look at the file extension. ⇔ When a browser sees the file extension .htm or .html, it will treat the file as an HTML file. ⇔ The .xml extension indicates an XML file, and the .css extension indicates a style sheet file. ⇔ Pictures are recognized by extensions like .gif, .png and .jpg. − Multimedia files also have their own formats and different extensions like: .swf, .wav, .mp3, .mp4, .mpg, .wmv, and .avi. Multimedia WepApp on Tizen - 2 - 2. Multimedia Playing with HTML5 Tags (1) HTML5 Video • Some of the popular video container formats include the following: Audio Video Interleave (.avi) Flash Video (.flv) MPEG 4 (.mp4) Matroska (.mkv) Ogg (.ogv) • Browser Support Multimedia WepApp on Tizen - 3 - • Common Video Format Format File Description .mpg MPEG. Developed by the Moving Pictures Expert Group. The first popular video format on the MPEG .mpeg web. -
Ardour Export Redesign
Ardour Export Redesign Thorsten Wilms [email protected] Revision 2 2007-07-17 Table of Contents 1 Introduction 4 4.5 Endianness 8 2 Insights From a Survey 4 4.6 Channel Count 8 2.1 Export When? 4 4.7 Mapping Channels 8 2.2 Channel Count 4 4.8 CD Marker Files 9 2.3 Requested File Types 5 4.9 Trimming 9 2.4 Sample Formats and Rates in Use 5 4.10 Filename Conflicts 9 2.5 Wish List 5 4.11 Peaks 10 2.5.1 More than one format at once 5 4.12 Blocking JACK 10 2.5.2 Files per Track / Bus 5 4.13 Does it have to be a dialog? 10 2.5.3 Optionally store timestamps 5 5 Track Export 11 2.6 General Problems 6 6 MIDI 12 3 Feature Requests 6 7 Steps After Exporting 12 3.1 Multichannel 6 7.1 Normalize 12 3.2 Individual Files 6 7.2 Trim silence 13 3.3 Realtime Export 6 7.3 Encode 13 3.4 Range ad File Export History 7 7.4 Tag 13 3.5 Running a Script 7 7.5 Upload 13 3.6 Export Markers as Text 7 7.6 Burn CD / DVD 13 4 The Current Dialog 7 7.7 Backup / Archiving 14 4.1 Time Span Selection 7 7.8 Authoring 14 4.2 Ranges 7 8 Container Formats 14 4.3 File vs Directory Selection 8 8.1 libsndfile, currently offered for Export 14 4.4 Container Types 8 8.2 libsndfile, also interesting 14 8.3 libsndfile, rather exotic 15 12 Specification 18 8.4 Interesting 15 12.1 Core 18 8.4.1 BWF – Broadcast Wave Format 15 12.2 Layout 18 8.4.2 Matroska 15 12.3 Presets 18 8.5 Problematic 15 12.4 Speed 18 8.6 Not of further interest 15 12.5 Time span 19 8.7 Check (Todo) 15 12.6 CD Marker Files 19 9 Encodings 16 12.7 Mapping 19 9.1 Libsndfile supported 16 12.8 Processing 19 9.2 Interesting 16 12.9 Container and Encodings 19 9.3 Problematic 16 12.10 Target Folder 20 9.4 Not of further interest 16 12.11 Filenames 20 10 Container / Encoding Combinations 17 12.12 Multiplication 20 11 Elements 17 12.13 Left out 21 11.1 Input 17 13 Credits 21 11.2 Output 17 14 Todo 22 1 Introduction 4 1 Introduction 2 Insights From a Survey The basic purpose of Ardour's export functionality is I conducted a quick survey on the Linux Audio Users to create mixdowns of multitrack arrangements. -
Sangoma T116 16-Span T1/E1/J1 Tapping Board
Sangoma T116 16-Span T1/E1/J1 Tapping Board Dedicated tapping solution for up to 8 two-way connections or 16 one-way connections. The T116 Tapping Card is part of Sangoma’s family of Advanced Flexible Telecommunications hardware product line — it uses the same high-performance PCI Express interface that is providing superior performance in critical systems all over the world. The T116 supports the passive tapping of up to 240 voice calls using up to 16 T1, E1 or J1 spans. With Sangoma cards, you can take advantage of hardware and software improvements, as soon as they become available. The T116, like all cards in Sangoma’s AFT family, is eld upgradable with unbreakable rmware. Choose the T116 to collect call control information, telecom protocol information and voice/media. T116 Card Features Sixteen receive-only spans with Supports Robbed Bit Channel optimum PCI-Express interface Associated Signaling (CAS) and ISDN enables tapping of sixteen one-way PRI or eight two-way conversation T1/E1 and fractional T1/E1, multiple Support for Asterisk®, Yate®, and channel HDLC per line for mixed 5 Year warranty on parts and labor FreeSWITCH® PBX/IVR Projects, as data/TDM voice applications well as other open source and Supports the passive tapping of up proprietary PBX, Switch, IVR, or VoIP WANPIPE® routing stack is to 240 voice calls using up to 16 gateway applications completely independent of TDM T1, E1 or J1 spans voice application for total system Optimized per channel DMA streams reliability and hardware-level HDLC handling Field -
Blackberry QNX Multimedia Suite
PRODUCT BRIEF QNX Multimedia Suite The QNX Multimedia Suite is a comprehensive collection of media technology that has evolved over the years to keep pace with the latest media requirements of current-day embedded systems. Proven in tens of millions of automotive infotainment head units, the suite enables media-rich, high-quality playback, encoding and streaming of audio and video content. The multimedia suite comprises a modular, highly-scalable architecture that enables building high value, customized solutions that range from simple media players to networked systems in the car. The suite is optimized to leverage system-on-chip (SoC) video acceleration, in addition to supporting OpenMAX AL, an industry open standard API for application-level access to a device’s audio, video and imaging capabilities. Overview Consumer’s demand for multimedia has fueled an anywhere- o QNX SDK for Smartphone Connectivity (with support for Apple anytime paradigm, making multimedia ubiquitous in embedded CarPlay and Android Auto) systems. More and more embedded applications have require- o Qt distributions for QNX SDP 7 ments for audio, video and communication processing capabilities. For example, an infotainment system’s media player enables o QNX CAR Platform for Infotainment playback of content, stored either on-board or accessed from an • Support for a variety of external media stores external drive, mobile device or streamed over IP via a browser. Increasingly, these systems also have streaming requirements for Features at a Glance distributing content across a network, for instance from a head Multimedia Playback unit to the digital instrument cluster or rear seat entertainment units. Multimedia is also becoming pervasive in other markets, • Software-based audio CODECs such as medical, industrial, and whitegoods where user interfaces • Hardware accelerated video CODECs are increasingly providing users with a rich media experience. -
SA1OPS English User Manual
Register your product and get support at www.philips.com/welcome SA1OPS08 SA1OPS16 SA1OPS32 EN User manual Select files and playlists for manual Contents sync 15 Copy files from GoGear Opus to your computer 16 English 1 Important safety information 3 WMP11 playlists 16 General maintenance 3 Create a regular playlist 16 Recycling the product 4 Create an auto playlist 16 Edit playlist 17 2 Your new GoGear Opus 6 Transfer playlists to GoGear Opus 17 What’s in the box 6 Search for music or pictures with WMP11 17 Delete files and playlists from WMP11 3 Getting started 7 library 17 Overview of the controls and Delete files and playlists from GoGear connections 7 Opus 18 Overview of the main menu 7 Edit song information with WMP11 18 Install software 8 Format GoGear Opus with WMP11 19 Connect and charge 8 Connect GoGear Opus to a computer 8 6 Music 20 Battery level indication 8 Listen to music 20 Battery level indication 9 Find your music 20 Disconnect GoGear Opus safely 9 Delete music tracks 20 Turn GoGear Opus on and off 9 Automatic standby and shut-down 9 7 Audiobooks 21 Add audiobooks to GoGear Opus 21 4 Use GoGear Opus to carry files 10 Audiobook controls 21 Select audiobook by book title 21 Adjust audiobook play speed 22 5 Windows Media Player 11 Add a bookmark in an audiobook 22 (WMP11) 11 Find a bookmark in an audiobook 22 Install Windows Media Player 11 Delete a bookmark in an audiobook 22 (WMP11) 11 Transfer music and picture files to WMP11 library 11 8 Video 23 Switch between music and pictures Download, convert and transfer library -
Surround Sound Processed by Opus Codec: a Perceptual Quality Assessment
28. Konferenz Elektronische Sprachsignalverarbeitung 2017, Saarbrücken SURROUND SOUND PROCESSED BY OPUS CODEC: APERCEPTUAL QUALITY ASSESSMENT Franziska Trojahn, Martin Meszaros, Michael Maruschke and Oliver Jokisch Hochschule für Telekommunikation Leipzig, Germany [email protected] Abstract: The article describes the first perceptual quality study of 5.1 surround sound that has been processed by the Opus codec standardised by the Internet Engineering Task Force (IETF). All listening sessions with up to five subjects took place in a slightly sound absorbing laboratory – simulating living room conditions. For the assessment we conducted a Degradation Category Rating (DCR) listening- opinion test according to ITU-T P.800 recommendation with stimuli for six channels at total bitrates between 96 kbit/s and 192 kbit/s as well as hidden references. A group of 27 naive listeners compared a total of 20 sound samples. The differences between uncompressed and degraded sound samples were rated on a five-point degradation category scale resulting in Degradation Mean Opinion Score (DMOS). The overall results show that the average quality correlates with the bitrates. The quality diverges for the individual test stimuli depending on the music characteristics. Under most circumstances, a bitrate of 128 kbit/s is sufficient to achieve acceptable quality. 1 Introduction Nowadays, a high number of different speech and audio codecs are implemented in several kinds of multimedia applications; including audio / video entertainment, broadcasting and gaming. In recent years the demand for low delay and high quality audio applications, such as remote real-time jamming and cloud gaming, has been increasing. Therefore, current research objectives do not only include close to natural speech or audio quality, but also the requirements of low bitrates and a minimum latency. -
Pre-Roll & Mid-Roll Video
Pre-roll & Mid-roll Video 1/2 THIRD PARTY ALL ASSETS BELOW ARE REQUIRED VAST SPECIFICATIONS TO BE PRESENT IN THE VAST TAG Not available for live stream sponsorships or feature sponsorships. All assets for sponsored Bit rate Codecs accepted Min dimensions Max file size Use cases content must use the "Network 10 Hosted Video In-Stream Ad with Companion" specifications. Mezzanine File 15–30 Mbps H.264 1920x1080 1.7 GB Required for SSAI Aspect ratio Format (High profile) Environments 16:9 Video will auto-scale correctly Frame Rate: 24 :15 – 4.5MB High Codec Constant frame rate only 2,100 kbps H.264 Mezzanine File - .mov +/- 50 kbps (High profile) 1024x576 :30 – 9MB bandwidth (H.264 High Profile) No de-interlacing with :18 – 18MB users no frame blending mp4 (high profile) :15 – 3.5MB Standard asset Remove any pull-down 1,500 kbps H.264 +/- 50 kbps (High profile) 960x540 :30 – 7MB for most users webm (VP8 or VP9) added for broadcast :18 – 14MB and pre roll Duration Audio :15 – 1MB Low 750 kbps H.264 768x432 :30 – 2MB bandwidth Network 10 accepts a variety of length Mezzanine file: 2 Channels only, AAC +/- 50 kbps (High profile) :18 – 4MB users creatives, standards include :6*, :15, :30, Codec, 192 KBPS minimum, 16 or 24 bit Available on :60*, :90*. only, 48 kHz Sample Rate. :15 – 4.5MB High 375 kbps H.264 Any tag submitted must contain creative mp4 assets: 2 Channels only, AAC Codec, +/- 50 kbps (High profile) 640x360 :30 – 9MB bandwidth of all the same length. 192 KBPS minimum, 16 or 24 bit only, 48 :18 – 18MB users kHz Sample Rate.