GStreamer gst_element_factory_make失败 [英] GStreamer gst_element_factory_make fails

问题描述

我正在尝试一个GStreamer测试应用程序，但在运行时下面的行失败：

I'm trying out a GStreamer test application, but at runtime the following line fails:

demuxer = gst_element_factory_make ("oggdemux", "ogg-demuxer"); // returns NULL

我使用MacOSX并通过MacPorts安装了GStreamer，libogg和vorbis工具。

I am using MacOSX and installed GStreamer, libogg and vorbis-tools through MacPorts. So I don't see why it fails.

有关如何使其工作的任何建议吗？

Any suggestions on how to make it work?

strong> EDIT：SOLVED！

SOLVED!

问题是我需要从gst-plugins-good包安装autodetect插件。

The problem was that I needed to install the autodetect plugin from the gst-plugins-good package.

下面列出了使其工作的操作：

Here's a list of actions that made it work:

删除MacPorts安装：

Remove the MacPorts installation:

sudo port uninstall gstreamer

将以下行添加到〜/ .profile

Add the following line to ~/.profile

export PKG_CONFIG_PATH=/opt/local/lib/pkgconfig:/usr/local/lib/pkgconfig:/usr/lib/pkgconfig

下载gstreamer，gstreamer-plugins-base和gstreamer-plugins-好的资源。

Download gstreamer, gstreamer-plugins-base and gstreamer-plugins-good sources.

建立并安装gstreamer（./configure，make，make install）

Build and install gstreamer (./configure, make, make install)

建立并安装gstreamer-plugins-base（./configure，make ，make install）

Build and install gstreamer-plugins-base (./configure, make, make install)

并且对于gstreamer-plugins-good我只是构建了autodetect包，因为构建所有导致错误的一些插件，我不需要或关心现在。我这样做：

And for gstreamer-plugins-good I only built the autodetect package because building all resulted in errors for some plugins that I don't need or care about now. I did it like this:

./configure
cd gst/autodetect/
make
sudo make install

现在程序构建并运行。

Right now the program builds and runs. I don't seem to be getting any audio output however :( but that's another issue.

推荐答案

阅读 gstelementfactory.c （GStreamer version 0.10.25）第463行（ gst_element_factory_make 函数定义），有三个错误导致 NULL return：

Reading gstelementfactory.c (GStreamer version 0.10.25) line 463 (gst_element_factory_make function definition), there are three errors which cause a NULL return:

1. 第一个参数（'factoryname'）是 NULL


2. 找不到命名的元素工厂（函数 gst_element_factory_find NULL ）


3. 无法创建元素实例（函数 gst_element_Factory_create NULL ）

1. The first argument ('factoryname') is NULL (obviously OK in your code)
2. The named element factory could not be found (the function gst_element_factory_find returned NULL)
3. The element instance could not created (the function gst_element_Factory_create returned NULL)

代码执行实质性日志记录，

The code performs substantial logging so if you are able to turn this on then you may get further hints as to the underlying problem.

要检查oggdemux插件配置是否正确，请尝试运行：

To check that the oggdemux plugin is configured correctly, try running:

gst-inspect oggdemux

如果这不返回结果，请尝试使用 gst-register 来注册它。

If this doesn't return a result, try using gst-register to register it.

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