Gstreamer基础教程+Qt_gstreamer qt-优快云博客

Gstreamer是一个支持Windows，Linux，Android， iOS的跨平台的多媒体框架，应用程序可以通过管道（Pipeline）的方式，将多媒体处理的各个步骤串联起来，达到预期的效果。每个步骤通过元素（Element）基于GObject对象系统通过插件（plugins）的方式实现，方便了各项功能的扩展。它与FFMPEG库作用类似，FFMPEG库通过给音视频相关库文件进行音视频操作;GStreamer则是一个音视频框架，只能按照其规范进行操作。本系列文章，按照您已经熟练使用QT进行演示操作。从零开始在QT环境下配置Gstreamer库

一、GStreamer库下载

下载链接：Download GStreamer

页面介绍：1.22.1 runtime installer 为运行版本

1.22.1 development installer 为开发版本

我们需要下载开发版本，下载文件名称：gstreamer-1.0-devel-msvc-x86_64-1.22.1.msi

二、Gstreamer库安装

1.双击 gstreamer-1.0-devel-msvc-x86_64-1.22.1.msi 文件，点击运行

2.点击next，选择change，点击next，等待安装完成即可。

三、在Qt中添加Gstreamer路径

1.路径拷贝

我的安装路径是D:\gstreamer，将D盘下gstreamer整个拷贝到QT工程目录中，路径结构如图所示

2.在QT的pro文件中添加库以及文件路径

1）需要添加三个库gobject-2.0.lib、glib-2.0.lib、gstreamer-1.0.lib；库路径可自己在  gstreamer文件夹中查找；添加方式如下图所示。

LIBS += -LD:/0.Study/1.Gstreamer/QtDemo/GstDemo/gstreamer/1.0/msvc_x86_64/lib/ -lgobject-2.0
LIBS += -LD:/0.Study/1.Gstreamer/QtDemo/GstDemo/gstreamer/1.0/msvc_x86_64/lib/ -lglib-2.0
LIBS += -LD:/0.Study/1.Gstreamer/QtDemo/GstDemo/gstreamer/1.0/msvc_x86_64/lib/ -lgstreamer-1.0

2）包含文件路径

INCLUDEPATH += D:/0.Study/1.Gstreamer/QtDemo/GstDemo/gstreamer/1.0/msvc_x86_64/lib/glib-2.0/include
INCLUDEPATH += D:/0.Study/1.Gstreamer/QtDemo/GstDemo/gstreamer/1.0/msvc_x86_64/include/glib-2.0
INCLUDEPATH += D:/0.Study/1.Gstreamer/QtDemo/GstDemo/gstreamer/1.0/msvc_x86_64/include/gstreamer-1.0
INCLUDEPATH += D:/0.Study/1.Gstreamer/QtDemo/GstDemo/gstreamer/1.0/msvc_x86_64/include/gstreamer-1.0/gst

四、helloworld示例代码

在main.cpp中增加的实例代码


#include <gst/gst.h>

int main(int argc, char *argv[])
{
     QApplication a(argc, argv);

     GstElement *pipeline;
     GstBus *bus;
     GstMessage *msg;

     /* Initialize GStreamer */
     gst_init (&argc, &argv);

     /* Build the pipeline */
     pipeline =
         gst_parse_launch
         ("playbin uri=https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm",
         NULL);

     /* Start playing */
     gst_element_set_state (pipeline, GST_STATE_PLAYING);

     /* Wait until error or EOS */
     bus = gst_element_get_bus (pipeline);
     msg =
         gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE,
         GST_MESSAGE_ERROR);

     /* See next tutorial for proper error message handling/parsing */
     if (GST_MESSAGE_TYPE (msg) == GST_MESSAGE_ERROR) {
       g_error ("An error occurred! Re-run with the GST_DEBUG=*:WARN environment "
           "variable set for more details.");
     }

     /* Free resources */
     gst_message_unref (msg);
     gst_object_unref (bus);
     gst_element_set_state (pipeline, GST_STATE_NULL);
     gst_object_unref (pipeline);
     return a.exec();
}