When I call these functions:
meta_api = gst_video_meta_api_get_type();
crop_meta = gst_buffer_get_video_crop_meta (buffer);
meta = gst_buffer_get_video_meta (buffer);
Obviously, I need to include these header files:
#include <gst/gst.h>
#include <gst/video/video.h>
#include <gst/video/gstvideometa.h>
The gstreamer library is dynamically linked at runtime. When I run the whole pipeline through gst-launch-1.0. I got this error:
undefined symbol: gst_video_meta_api_get_type
And all the function call about gstmeta would not work. I have struggled on this for a long time. Please help!
My gstreamer is installed through compiling source code. Any other function call are fine.
Thanks in advance.
You need to make sure you are linking against the needed libraries.
For the base plugins link against -lgstbase-1.0 and for video plugins link against -lgstvideo-1.0. I am not 100% sure which of the two that function resides but linking against both will fix it for you.