<html><head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"></head><body style="font-family: Avenir;" bgcolor="#FFFFFF" text="#000000"> <div style="font-family: Avenir;">Hello, This is a newbie question and I already had a lot of help from the IRC channel in compiling from cerbero, but I can't find a simple solution for this problem. My pipeline looks like this : videotestsrc -> videoconvert -> glfilterapp -> appsink (with callback) I try to get a valid OpenGL texture from the appsink's callback and to display it in an NSOpenGLView. It looks like I manage to get one via : GstVideoFrame frame; GstVideoInfo info; gst_video_info_init(&info); gst_video_info_from_caps(&info, caps); if (gst_video_frame_map(&frame, &info, buf, (GstMapFlags)(GST_MAP_READ | GST_MAP_GL))) // (GST_MAP_FLAG_LAST << 1) ? { GLuint tex = (*(guint *) frame.data[0]); gst_video_frame_unmap(&frame); } It returns a texture ID between 5 and 8. Actually I got this code from various places and I don't really understand what I'm doing with the flags. But when I'm passing the texture to my NSOpenGLView it only display white. The OpenGL Profiler tool tells me that I have (obviously) 2 contexts running. So I tried to create a shared context via : GstGLDisplay *display = gst_gl_display_new(); GstGLContext *ctx = gst_gl_context_new_wrapped(display, (guintptr)cgl_ctx, GST_GL_PLATFORM_CGL, GST_GL_API_ANY); gst_gl_context_create(context, ctx, NULL); // to share the 2 contexts if I understand well where "cgl_ctx" is a CGLContextObj I get from my NSOpenGLView and "context" the context I want to pass to the appsink. First, I have this error : [GLib-CRITICAL **: g_hash_table_insert_internal: assertion 'hash_table != NULL' failed]. When I play the pipeline, I have this other error : [GStreamer-CRITICAL **: gst_object_unref: assertion 'object != NULL' failed] The 2 errors disappear if I don't create the context. Second, I don't know how to pass the context (if it is well created) to the glfilterapp element in order (I guess) to have a texture from the appsink in the shared context. I know this is a usual question, but any advice would really be great ! Thank you. Benoît. <div class="moz-signature"> </div></div> </body> </html>