这是在遵循gstreamer插件示例时发生的

Question

首先，我通过git clone https://gitlab.freedesktop.org/gstreamer/gst-template.git命令下载了git

和外壳$ cd template/gst-plugin/src已完成输入外壳$ ../tools/make_element MyFilter命令

我在/gst- -C中构建介子，然后是忍者模板构建，所以日志如下所示。

    ninja: Entering directory `build/'
[1/4] Compiling C object gst-plugin/libgstplugin.so.p/src_gstplugin.c.o
FAILED: gst-plugin/libgstplugin.so.p/src_gstplugin.c.o 
cc -Igst-plugin/libgstplugin.so.p -Igst-plugin -I../gst-plugin -I/usr/include/gstreamer-1.0 -I/usr/include/glib-2.0 -I/usr/lib/aarch64-linux-gnu/glib-2.0/include - fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -g -fPIC -pthread -DHAVE_CONFIG_H -MD -MQ gst-   plugin/libgstplugin.so.p/src_gstplugin.c.o -MF gst-plugin/libgstplugin.so.p/src_gstplugin.c.o.d -o gst-plugin/libgstplugin.so.p/src_gstplugin.c.o -c ../gst-    plugin/src/gstplugin.c
../gst-plugin/src/gstplugin.c:102:45: error: expected ‘)’ before string constant
GST_ELEMENT_REGISTER_DEFINE (myfirstplugin, "myfirstplugin", GST_RANK_NONE,
                                              ^~~~~~~~~~

../gst-plugin/src/gstplugin.c: In function ‘plugin_init’:
../gst-plugin/src/gstplugin.c:266:10: warning: implicit declaration of function ‘GST_ELEMENT_REGISTER’; did you mean ‘GST_ELEMENT_CAST’? [-Wimplicit-       function-declaration]
   return GST_ELEMENT_REGISTER (myfirstplugin, plugin);
                                ^~~~~~~~~
          GST_ELEMENT_CAST
../gst-plugin/src/gstplugin.c:266:32: error: ‘myfirstplugin’ undeclared (first use in this function); did you mean ‘GstPlugin’?
return GST_ELEMENT_REGISTER (myfirstplugin, plugin);
                              ^~~~~~~~~~~~~
                            GstPlugin
../gst-plugin/src/gstplugin.c:266:32: note: each undeclared identifier is reported only once for each function it appears in
../gst-plugin/src/gstplugin.c:267:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

[2/4] Compiling C object gst-plugin/libgstaudiofilterexample.so.p/src_gstaudiofilter.c.o
FAILED: gst-plugin/libgstaudiofilterexample.so.p/src_gstaudiofilter.c.o 
cc -Igst-plugin/libgstaudiofilterexample.so.p -Igst-plugin -I../gst-plugin -I/usr/include/gstreamer-1.0 -I/usr/include/glib-2.0 -I/usr/lib/aarch64-linux-gnu/glib-  2.0/include -I/usr/include/orc-0.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -g -fPIC -pthread -DHAVE_CONFIG_H -MD -MQ    gst-plugin/libgstaudiofilterexample.so.p/src_gstaudiofilter.c.o -MF gst-plugin/libgstaudiofilterexample.so.p/src_gstaudiofilter.c.o.d -o gst-   plugin/libgstaudiofilterexample.so.p/src_gstaudiofilter.c.o -c ../gst-plugin/src/gstaudiofilter.c
../gst-plugin/src/gstaudiofilter.c:99:51: error: expected ‘)’ before string constant
 GST_ELEMENT_REGISTER_DEFINE (audiofiltertemplate, "audiofiltertemplate",
                                                        ^~~~~~~~~~~~~~
../gst-plugin/src/gstaudiofilter.c: In function ‘plugin_init’:
../gst-plugin/src/gstaudiofilter.c:311:10: warning: implicit declaration of function ‘GST_ELEMENT_REGISTER’; did you mean ‘GST_ELEMENT_CAST’? [-Wimplicit-  function-declaration]
 return GST_ELEMENT_REGISTER (audiofiltertemplate, plugin);
                   ^~~~~~~~~
         GST_ELEMENT_CAST
../gst-plugin/src/gstaudiofilter.c:311:32: error: ‘audiofiltertemplate’ undeclared (first use in this function); did you mean ‘GstAudioFilterTemplate’?
   return GST_ELEMENT_REGISTER (audiofiltertemplate, plugin);
                                   ^~~~~~~~~~~~
                            GstAudioFilterTemplate
../gst-plugin/src/gstaudiofilter.c:311:32: note: each undeclared identifier is reported only once for each function it appears in
../gst-plugin/src/gstaudiofilter.c:312:1: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^
    ninja: build stopped: subcommand failed.

Answer 1

安装的gstreamer版本与git存储库中的克隆版本不匹配。

使用gst-launch-1.0 --version确定已安装的版本。要使用gst-plugin示例，至少需要1.18。