GStreamer的gst_element_factory_make失败 [英] GStreamer gst_element_factory_make fails

问题描述

我想了GStreamer的测试应用程序，但在运行时以下行失败：

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

我使用的MacOSX和安装的GStreamer，通过MacPorts的libogg和Vorbis的工具。所以，我不明白为什么它会失败。

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

如何使工作有什么建议？

Any suggestions on how to make it work?

编辑：解决

问题是，我需要安装从GST-插件好的包自动检测插件。

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

下面是这使它工作的操作列表：

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

删除的MacPorts安装：

Remove the MacPorts installation:

sudo的港口卸载的GStreamer

以下行添加到〜/ .profile文件

Add the following line to ~/.profile

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

下载的GStreamer，GStreamer的-插件基地和GStreamer的 - 插件 - 良好来源。

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

编译并安装的GStreamer（的./configure，make，make install的）

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

编译并安装的GStreamer-插件基地（的./configure，make，make install的）

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

和对的GStreamer-plugins的好，我只内置自动检测包，因为建筑均导致错误行为我不需要或不关心现在的一些插件。我做这样的：

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

目前该方案建立并运行。我似乎没有然而，要得到任何音频输出:(但那是另一个问题。

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的版本0.10.25）线463（ gst_element_factory_make 函数定义），有三个错误，这些错误会导致 NULL 回报：

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'）为 NULL （在你的code显然OK）


2. 命名的元素工厂无法找到（函数 gst_element_factory_find 返回 NULL ）


3. 元素实例不能创建（函数 gst_element_Factory_create 返回 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)

在code进行大量的记录，所以如果你能够把这个，那么你可能会得到进一步的提示为根本问题。

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

如果这不会返回结果，请尝试使用 GST-寄存器进行注册。

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

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