capsfilter in videomixer

[bboyavatar]

I use the following pipeline to make two videos mixed successfully
"gst-launch -v videomixer name=mix ! ffmpegcolorspace ! xvimagesink filesrc
location=foreman.264 ! h264parse ! ffdec_h264 ! videoscale !
video/x-raw-yuv, width=352, height=288 ! ffmpegcolorspace ! videobox ! mix.
filesrc location=foreman1.264 ! h264parse ! ffdec_h264 ! ffmpegcolorspace !
videobox border-alpha=0 alpha=1 top=-288 bottom=0 left=-352 ! mix."
http://gstreamer-devel.966125.n4.nabble.com/file/n4655467/1.jpg 
I try to translate this pipeline into C code. It does not work well.

#include<gst/gst.h>
#include<glib.h>
#include<stdio.h>
/*
gst-launch videomixer name=mix ! ffmpegcolorspace ! xvimagesink filesrc
location=foreman.264 ! h264parse ! ffdec_h264 ! videoscale !
video/x-raw-yuv, width=352, height=288 ! ffmpegcolorspace ! videobox ! mix.
filesrc location=foreman1.264 ! h264parse ! ffdec_h264 ! ffmpegcolorspace !
videobox border-alpha=0 alpha=1 top=-288 bottom=0 left=-352 ! mix.
*/
static gboolean
bus_call (GstBus * bus, GstMessage * msg, gpointer data)
{
  GMainLoop *loop = (GMainLoop *) data;

  switch (GST_MESSAGE_TYPE (msg)) {
    case GST_MESSAGE_EOS:{
      g_print ("End-of-stream\n");
      g_main_loop_quit (loop);
      break;
    }
    case GST_MESSAGE_ERROR:{
      gchar *debug;
      GError *err;

      gst_message_parse_error (msg, &err, &debug);
      g_free (debug);

      g_print ("Error: %s\n", err->message);
      g_error_free (err);

      g_main_loop_quit (loop);

      break;
    }
    default:
      break;
  }
  return TRUE;
}

int main(int argc,char *argv[])
{
GMainLoop *loop;
GstElement
*pipeline,*mixer,*colorspace,*imagesink,*filesrc1,*h264parse1,*h264dec1,*colorspace1,*videobox1,*filesrc2,*h264parse2,*h264dec2,*colorspace2,*videobox2;
GstElement *videoscale1,*capsfilter1;
GstCaps *caps;
GstBus *bus;

gst_init(&argc, &argv);

caps = gst_caps_new_simple ("video/x-raw-yuv",
"width", G_TYPE_INT, 352,
"height", G_TYPE_INT, 288,
NULL);

capsfilter1=gst_element_factory_make("capsfilter","capsfilter1");
g_object_set(G_OBJECT(capsfilter1),"caps",caps,NULL);
gst_caps_unref (caps);

mixer = gst_element_factory_make ("videomixer", "mixer");
colorspace = gst_element_factory_make ("ffmpegcolorspace", "colorspace");
imagesink = gst_element_factory_make ("xvimagesink", "imagesink");

filesrc1 = gst_element_factory_make ("filesrc", "filesrc1");
g_object_set (G_OBJECT (filesrc1), "location", "foreman.264", NULL);
h264parse1 = gst_element_factory_make ("h264parse", "h264parse1");
h264dec1 = gst_element_factory_make ("ffdec_h264", "h264dec1");
colorspace1 = gst_element_factory_make ("ffmpegcolorspace", "colorspace1");
videobox1 = gst_element_factory_make ("videobox", "videobox1");
g_object_set (G_OBJECT (videobox1), "top", 0, NULL);
g_object_set (G_OBJECT (videobox1), "bottom", 0, NULL);
g_object_set (G_OBJECT (videobox1), "left", 0, NULL);

videoscale1=gst_element_factory_make("videoscale","videoscale1");
g_assert (videoscale1 != NULL);

filesrc2 = gst_element_factory_make ("filesrc", "filesrc2");
g_object_set (G_OBJECT (filesrc2), "location", "foreman1.264", NULL);
h264parse2 = gst_element_factory_make ("h264parse", "h264parse2");
h264dec2 = gst_element_factory_make ("ffdec_h264", "h264dec2");
colorspace2 = gst_element_factory_make ("ffmpegcolorspace", "colorspace2");
videobox2 = gst_element_factory_make ("videobox", "videobox2");
g_object_set (G_OBJECT (videobox2), "top", -288, NULL);
g_object_set (G_OBJECT (videobox2), "bottom", 0, NULL);
g_object_set (G_OBJECT (videobox2), "left", -352, NULL);

loop = g_main_loop_new (NULL, FALSE);
pipeline = gst_pipeline_new ("my_pipeline");

gst_bin_add_many(GST_BIN (pipeline),mixer,colorspace,imagesink,NULL);
gst_element_link_many (mixer, colorspace, imagesink, NULL);

gst_bin_add_many(GST_BIN
(pipeline),filesrc1,h264parse1,h264dec1,videoscale1,capsfilter1,colorspace1,videobox1,NULL);
//gst_bin_add_many (GST_BIN
(pipeline),imagesink,filesrc1,h264parse1,h264dec1,videoscale1,capsfilter1,colorspace1);
//gst_element_link_many(filesrc1,
h264parse1,h264dec1,videoscale1,capsfilter1,colorspace1,imagesink);
gst_element_link(filesrc1, h264parse1);
gst_element_link(h264parse1,h264dec1);
gst_element_link(h264dec1,colorspace1);
gst_element_link(colorspace1,videoscale1);
gst_element_link(videoscale1,capsfilter1);
gst_element_link(capsfilter1,videobox1);
gst_element_link(videobox1,mixer);

gst_bin_add_many(GST_BIN
(pipeline),filesrc2,h264parse2,h264dec2,colorspace2,videobox2,NULL);
gst_element_link(filesrc2, h264parse2);
gst_element_link(h264parse2,h264dec2);
gst_element_link(h264dec2,colorspace2);
gst_element_link(colorspace2,videobox2);
gst_element_link(videobox2,mixer);

//gst_element_link_many (filesrc1,
h264parse1,h264dec1,videoscale1,capsfilter1,colorspace1,videobox1,mixer);
//gst_element_link_many (filesrc2,
h264parse2,h264dec2,colorspace2,videobox2,mixer);


bus = gst_pipeline_get_bus (GST_PIPELINE(pipeline));
gst_bus_add_watch (bus, bus_call, loop);
g_object_unref (bus);

gst_element_set_state (pipeline, GST_STATE_PLAYING);
g_main_loop_run (loop);

gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (GST_OBJECT (pipeline));
g_main_loop_unref (loop);

return 0;
}

http://gstreamer-devel.966125.n4.nabble.com/file/n4655467/2.jpg 
Can anyone tell me what is wrong? Thanks!

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