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Mpeg2-ts audio and Video synchronization principle

First, Introduction The MPEG2 system is used for AV synchronization and time labels for system clock recovery in the 3 levels of es,pes and TS respectively. On the TS layer, the TS header information contains the program Clock Reference PCR (Programme clock Reference), It is used to recover the system timing clock STC, which is consistent with the encoder end. In the PES layer, the PES header information contains a timestamp of PTS (Presentation time Stamp) and Decode Timestamp DTS (decoding tim

FFmpeg Implementing Audio Resample (resampling)

FFmpeg Implementing Audio Resample (resampling) The following code is an implementation of the three main elements of audio: Channel, sample, sample rate change demo such as two channels into mono, 44100->48000,float->s16 and so on. int audioresampling (Avcodeccontext * audio_dec_ctx,avframe * paudiodecodeframe, int out_sample_fmt,int out_channels, int out_sample_rate, uint8_t * out_buf) {/////////////

Audio drop-sampling factor

If you need to reduce the 8K, 16K, 32K, 48K sample rate of audio data to 4K audio data, the simplest way to pick points based on the frequency reduction, but the linearity is not good. Another way to better linearity is to take the appropriate number of points, multiply the points by the coefficients of the respective points, and then add the average. The relationship between the frequency reduction multipl

Use PDO storage to store pictures and audio files in a database

audio in a database is particularly well understood because they are files that can be read with a function and then saved in a string and then stored in a database. The database is as follows:1 CREATE TABLE pic (2 Key null,3 null4 ) Engine=myisam Charset=utf8;Create a form to submit a file, note the form that submits the file (the form's Properties method= "POST" enctype= "Multipart/form-data")12345 6PHP7 if(!Empty($_post)){8

IOS development: audio session

In iOS development, the most important framework for audio and video is the avfoundation framework. Starting from this article, we will focus on avfoundation-based audio usage and processing. To learn how to use audio, you must first understand the audio session. 1. What is an aud

Those years, we were together by the pit of the H5 audio

Original address: HTTP://WEIBO.COM/P/23041874D6CEDD0102VKBRDo not be so literary title scare, here will not tell you the history of girls in high school, there will not be any other reality should not have the pit Father plot, please note that this is a technical article, the main thing is: audio in the mobile side of the compatibility problem, as to why the title to play so literary and artistic, It's just to cater to this microblog:God horse? You're

IOS Audio Cache playback Ideas

BasisLet's take a quick look at some basic audio knowledge.At present, we need to rely on audio files for audio playback on the computer, audio file generation process is the sound information sampling, quantization and encode the digital signal generated by the process, the sound that the human ear can hear, the lowes

Audio design scheme in smart phones

When mobile phones are constantly integrated with various functions including photography, games, data, and video, they have become a playing platform for multimedia applications, it can be said that the development of Portable mini-computers is meticulous. In terms of positioning, such a mobile phone is different from a voice phone or a feature phone with some features, but rather a smart phone ). In addition to strong data editing and management capabilities, smart phones provide

Audio design in smart phones

When mobile phones are constantly integrated with various functions including photography, games, data, and video, they have become a playing platform for multimedia applications, it can be said that the development of Portable mini-computers is meticulous. In terms of positioning, such a mobile phone is different from a voice phone or a feature phone with some features, but rather a smart phone ). In addition to strong data editing and management capabilities, smart phones provide

iOS audio playback (i): Overview turn

Today see very good introduction audio development articles, reproducedOriginal address: http://msching.github.io/blog/2014/07/07/audio-in-ios/PrefaceMusic-related app development has been for some time, in the process of the app's player several changes I also therefore for iOS audio playback implementation has been a certain research. Write this series of blog

Wince6.0 audio playback Problems

Record: Question: How can I play a WAV, WMA, or MP3 audio in wince? What is the specific function? I use playsound (text ("\ Sounds \ bell.wav "), null, snd_sync | snd_nodefault); why not? I put \ Sounds \ bell.wav directly under the root directory of the project folder. After I remove snd_nodefault, I only play a "beep" sound. It is estimated that it is a system sound. You can also use sndplaysound () to answer the same question. Why: if you can play

Instant Messaging--a detailed audio-video synchronization technology

Transferred from: http://tieba.baidu.com/p/2138076570Abstract: In order to solve the problem of audio and video synchronization caused by delay, jitter and network transmission conditions, a new audio and video synchronization scheme is designed and implemented to adapt to different network conditions. Using the audio and video coding technology, AMR-WB and H. e

iOS audio playback (a): overview

(This article transferred from the Code farm Life )ObjectiveMusic-related app development has been for some time, in the process of the app's player after several changes, I also for iOS audio playback implementation has a certain research.Write this series of blog purpose on the one hand hope to be able to stimulate, on the other hand is also hope to help other iOS developers and enthusiasts less detours (I have encountered a lot of pits). This artic

"Go" IOS audio-avaudiosession

1. Avaudiosession OverviewThe last year has been doing iOS client development for IPC camera. To deal with audio, you have to figure outAvaudiosession.First look at the Apple's official map:Audio SessionYou can see that avaudiosession is used to manage the resource usage of multiple apps on audio hardware devices (microphones, speakers).For example, avaudiosession can do these things. Set whether y

[9] about audio

What is AAC? AAC, Advanced audio coding, is a technique for compressing digital audio files. officially part of the MPEG-4 standard, itIsMost widely used to create small digital audio files. The current variant is specified in ISO/IEC Standard 14496-3. AACIs conceptually similar to the ubiquitous MP3 format. like MP3, it takes advantage of deficiencies in huma

Ubuntu under GStreamer configuration and playback audio and video examples

Official website:http://gstreamer.freedesktop.orgGStreamer Installation:Installing with sudo apt-get installsudo apt-get install Libgstreamer0.10-dev gstreamer-tools gstreamer0.10-tools Gstreamer0.10-docsudo apt-get install gstreamer0.10-plugins-base gstreamer0.10-plugins-good gstreamer0.10-plugins-ugly Gstreamer0.10-plugins-bad Gstreamer0.10-plugins-bad-multiverseA plugin with the following GST is installed:Gstreamer0.10-toolsGstreamer0.10-xGstreamer0.10-plugins-baseGstreamer0.10-plugins-goodgs

Linux audio and video (V4L2 operating principle)

650) this.width=650; "src=" http://www.geconline.cn/files/default/2016/03-05/10341682808d857434.jpg?6.15.4 "style= "Border:0px;vertical-align:middle;height:auto;"/>The Linux kernel uses a mechanism called V4L2 to manage camera image information, and its core work is like the usual circulation tables in Japanese restaurants, where the chef keeps the food on the empty plates and the guests eat them.Expand:In the kernel, the video data captured by the camera can be stored in a queue, and we do this

How to burn Ape&flac lossless audio with Nero

The first thing to do is to download the plugin for Nero to identify ape and FLAC files, for NxMyAPE.dll and NxMyFLA.dll, to download it after searching, and to put the next good plugin in the Audiopluginmgr folder of the Nero installation location And to burn the lossless audio file to the first simple English name, with Pinyin. Nero Plugin not well recognized in Chinese Open the cue file for the lossless file and change the content to

How to set up Sohu audio and video playback screen proportion

Method/Step 1, Start Sohu Audio-visual, click the upper left corner of the program interface "Sohu av" option. (as shown in the picture) 2, click "Sohu av" after the pop-up drop-down menu, click Select "Settings" option. (as shown in the picture) 3, under the "Settings" interface, click Select "Player Settings"--> "Screen settings" option. (as shown in the picture) 4, in the "Screen settings" option, move the screen adjust the

Dom's full introduction to the book brings you a different kind of audio-visual feast

Dom Music (Duomi) aggregates millions of of high-quality music resources on the internet, dedicated to giving millions of Internet users the highest quality of music to enjoy. Let the high fidelity of the sound and beautiful picture and you love the music of the soul dances. So let's go into the personalized music service platform. Multi-meter music takes you to enjoy the different audio-visual feast.   One, always share good music If you are in the

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