gstreamer book

One: Overview As we saw in the elements chapter, pads is an element external interface. The data stream from one element of the source pad to another element of the sink pad. The pads function (capabilities) determines the type of media that an element can handle. The type of a pad is determined by 2 characteristics: its data-oriented (direction) and its timeliness (availability). As we mentioned earlier, GStreamer defines 2 kinds of pads data-oriente

Gstreamer officially has a script: GST-uninstalled, which will export a bunch of environment variables, such as path, LD_LIBRARY_PATH, pkg_config_path ..., this ensures that after the script is modified, All executable files, libraries, and configurations related to gstreamer point to the gstreamer version under the directory we set. This means that we can build

1) Overview Bus is a simple system that uses its own threading mechanism to distribute messages from a pipe thread to an application. The advantage of the bus is that when GStreamer is used, the application does not require thread recognition, even if GStreamer has been loaded with multiple threads. Each pipeline contains a bus by default, so the application does not need to create the bus again. The applic

In the previous section, we briefly introduced gstelementfactory can be used to create an instance of element, but gstelementfactory not only do it, gstelementfactory as a GStreamer A basic type in the registration system that describes all the plug-ins (plugins) and the element created by GStreamer. This means that gstelementfactory can be applied to some automatic element instances, such as an automatic p

Ubuntu14.04 install GStreamer to test UVC H264 CameraRecently debugging UVC H264 Camera, need to test the camera in Ubuntu, so with the help of GStreamer to achieve.Gtreamer is a programming framework based on the glib library (the latest version needs glib2.0) to build streaming media applications, the goal of which is to simplify the development of audio/video applications that can now be used to deal wit

This tutorial introduces a new way to create pipeline-created in the run, rather than at the end of a one-time creation before running. Introduced The pipeline in this tutorial are not all created before the run is complete. Relax, there's no problem with this. If we do not do more in-depth processing, then the data will be dropped at the end of the pipeline, of course, we will certainly do in-depth processing ... In this example, we will open a file that already contains the audio and video (Co

For programmers, one of the most important concepts in GStreamer is the Gstelement object. This object is the base block for building a media pipeline. All upper layer (high-level) parts originate from the Gstelement object. Any decoder encoder, splitter, video/audio output part is actually a Gstelement object.For programmers, element is like a black box. You enter data at one end of the element, element processes the data, and the data is output from

1) Overview Bins is a container element. You can add an element to the bins. Since bins is also an element in itself, you can manipulate bins like a normal element. As a result, the contents of the previously closed element can also be applied to bins. Bins allows you to combine a set of linked element into a large logical element. You no longer need to operate on a single element, only the bins. When you build a complex pipeline, you'll find bins's great advantage, because it allows you to brea

Compile an Mp3 player based on GStreamer and an mp3 player based on gstreamer I. Introduction The author's system is CentOS6. Based on this, this article develops Mp3 players and uses the mp3 decoding library libmad and gstreamer0.10-plugins-uugly. The detailed steps are as follows. Ii. Procedure 1) download wget ftp://ftp.pbone.net/mirror/atrpms.net/el5-x86_64/atrpms/stable/libmad0-0.15.1b-4.el5.x86_

Goal The pad's capabilities is the basis of a GSTREAMER element because the framework is automatically processed most of the time, so we almost don't feel it exists. This tutorial compares the principle of bias, introduces: What is pad capabilities How to get this thing When should I get this thing? Why do you need to know them? Introduced Pads Pads allows information to enter or leave a element--as if it had been shown. This capabilities (or simply

GStreamer is the programming framework (framework) used to build streaming media applications in the GNOME desktop environment, the goal of which is to simplify the development of audio/video applications that can now be used for processing such as MP3, Ogg, MPEG1, MPEG2, AVI, Quicktime Multimedia data in a variety of formats. 　　 　　 I. Basic Concepts GStreamer as a recommended streaming media applicati

First, the basic conceptGStreamer is the recommended streaming media application framework for the GNOME desktop environment, with a plug-in (plugin) and pipeline (pipeline) architecture, all functional modules in the framework are implemented as pluggable components (component), And can be easily installed on any pipe when needed, because all the plug-ins through the pipeline mechanism for unified data exchange, it is easy to use the existing various plug-ins "assemble" a fully functional multi

I. Basic Concepts Gstreamer is recommended for GNOME Desktop streaming.YingThe framework uses the architecture based on plug-ins and pipelines. All functional modules in the framework are implemented as pluggable components.(Component), and can be easily installed to any pipeline as needed. Because all plug-ins use the pipeline mechanism for unified data exchange, it is easy to use the existingThe plug-in "assembles" a multimedia application with exce

Configure the gstreamer development environment quickly in Windows Du Jing 2010-07-21 Shanghai This article uses ossbuild to quickly build a gstreamer development environment in windows. If you want to use GTK for development, you can refer to other blog posts. (Download the complete environment in this article) 1. Install the GStreamer-WinBuilds-GPL-x86.msi, us

Http://www.doc88.com/p-8985391206739.html 2.1.2. "One target" media Player/Media Library A typical MPEG player can play MPEG video and audio, and most players implement a complete bottom-up construct to reach their sole goal: play. There is no set of effective mechanisms available to provide filtering and effect processing for audio and video data, or any provision for adding filters or special effects in video or audio data. If you want to convert the MPEG-2 video stream to an AVI file, your

http://gstreamer.freedesktop.org/src/Http://gstreamer.freedesktop.org/data/doc/gstreamer/head/qt-gstreamer/html/index.htmlThere are few tutorials on Qtgstreamer on the internet, so we have to start with the source code. This is my own summary of a small method, generally use these open source libraries, if there is no large company to do maintenance support, often found that the document is not complete. So

Camera hardware and Linux The Linux operating system supports real-time video and audio hardware, such as cameras, TV tuner, video capture card, fmbroadcast tuner, and videoOutputDevices and other major API applications to access these devices are video4linux. Video4linux isKernelAPI, so it must be the kernel driver for each supported device. At the user level, device access is standardized through device files. This file focuses on video capture devices, such as cameras./Dev/video0,/Dev/video1T

This article describes how to use gstreamer to compile a simple MP3 player. 1. You need to use the mad decoding plug-in. Therefore, you need to install gstreamer0.10-plugins-uugly first. 2. Compile an MP3 player The following describes how to use the components provided by the gstreamer framework to implement a simple MP3 player. The data source component reads data from the disk, the filter component decod

Use activatepush_function in gstrtpjitterbuffer. C to check the activation mechanism in gstreamer. Related functions: ststst_pad_set_activatepush_function. You can refer to the document part-activation.txt under the DOC/designdirectory in the gstreamer package. This document makes the logic of pad active clearer. First, gstreamer core will call the activate meth

The gstreamer plug-in already has a good time, so it's hard to tell you how to prepare a plug-in, the plug-in writer's guide of gstreamer should be unable to understand how to call gstreamer to do things, and the resources found on the Internet, in addition, most components are in the integration layer (that is, the pipeline player), and for the development layer