Unable to get the sample from Appsink using C++

RK29 giri_2984 at yahoo.co.in
Mon Aug 24 16:52:35 UTC 2020

Hey Guys, I was able to get callback working but the moment I add the
capsfilter the call back does not work. Please help me to find the problem:

GstCaps* videosinkcaps =gst_caps_from_string("video/x-raw,format=BGR, width=
1280, height=720,framerate=10/1");
        GstElement* capsf = gst_element_factory_make("capsfilter", NULL);
        GstElement* appSink = gst_element_factory_make("appsink", NULL);
        g_object_set(G_OBJECT(capsf), "caps", videosinkcaps, NULL);
        gst_app_sink_set_emit_signals((GstAppSink*)appSink, true);
        gst_app_sink_set_drop((GstAppSink*)appSink, true);
        gst_app_sink_set_max_buffers((GstAppSink*)appSink, 30000);				//
Limit the number of buffers the appsink can store if we don't take anything
from it
        GstAppSinkCallbacks callbacks = { NULL, NULL, new_sample1 };	//
These are the functions called when we get a new preroll (new_preroll) and a
new buffer/image (new_sample)
        gst_app_sink_set_callbacks(GST_APP_SINK(appSink), &callbacks, pipe,
NULL); // 'data' is just some user data sent to the callback so you can
update your own data, if needed
        gst_bin_add_many(GST_BIN(pipe), q, conv, scale, capsf, appSink,
       // gst_element_link_filtered(conv, scale, videosinkcaps);
        if (!gst_element_link_many(q, conv, scale,capsf, appSink, NULL))
            g_critical("Failed to link elements with automatic caps!

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