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我想打印出 gstreamer-0.10 元素的管道。如何才能做到这一点？

外部开发人员为我们编写的代码：

static GstElement* jpgPipeline  = NULL;
pipedef = g_strdup_printf("appsrc name=jpgsrc ! ffmpegcolorspace %s %s %s %s %s  ! ffmpegcolorspace ! jpegenc quality=%i ! multifilesink name=jpgsink location=\"image.jpg\"",cropStr, scaleStr, sharpenStr,vbStr,gammaStr,quality);
jpgPipeline = gst_parse_launch (pipedef, &error);
bus = gst_pipeline_get_bus(GST_PIPELINE(jpgPipeline));
gst_element_set_state (jpgPipeline, GST_STATE_PLAYING);

我正在尝试通过以下方式查看管道：

g_print(gst_element_info(jpgPipeline));

但是当我尝试编译它时会收到很多警告。

main.c:331:2: warning: implicit declaration of function ‘gst_element_info’ [-Wimplicit-function-declaration]
  g_print(gst_element_info(jpgPipeline));
  ^
main.c:331:2: warning: passing argument 1 of ‘g_print’ makes pointer from integer without a cast [enabled by default]
In file included from /usr/include/glib-2.0/glib.h:62:0,
                 from /usr/include/gstreamer-0.10/gst/gst.h:27,
                 from main.c:5:
/usr/include/glib-2.0/glib/gmessages.h:265:17: note: expected ‘const gchar *’ but argument is of type ‘int’
 void            g_print                 (const gchar    *format,
                 ^
main.c:331:2: warning: format not a string literal and no format arguments [-Wformat-security]
  g_print(gst_element_info(jpgPipeline));
main.c:(.text.startup+0x651): undefined reference to `gst_element_info'
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1 回答 1

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第一个也是最重要的：请使用 1.0，0.10 已经过时多年了。

这gst_element_info不存在 AFAIK。您希望将什么打印为有关管道的字符串？里面的元素？你想如何表示链接？

也许使用点表示会更好。在此处找到一些说明：https ://developer.ridgerun.com/wiki/index.php/How_to_generate_a_Gstreamer_pipeline_diagram_%28graph%29或https://www.freedesktop.org/software/gstreamer-sdk/data/docs/latest/gstreamer -0.10/gstreamer-GstInfo.html#GST-DEBUG-BIN-TO-DOT-FILE:CAPS

于 2016-09-02T13:07:05.220 回答