question on "transform could not transform video/x-raw ..."

[Halley Zhao]

Hi expert:
I try to use appsrc-->videoencode-->appsink, but got the following error.
while if I use videotestsrc-->videoencode-->appsink, there is no such
error. I don't know where is the mistake:
“
0:00:00.159532875 30661      0xabcff20 FIXME                default
gstutils.c:3963:gst_pad_create_stream_id_internal:<source:src> Creating
random stream-id, consider implementing a deterministic way of creating a
stream-id
0:00:00.160083500 30661      0xabcff20 WARN           basetransform
gstbasetransform.c:1355:gst_base_transform_setcaps:<capsfilter0> transform
could not transform video/x-raw, format=(string)NV12, width=(int)640,
height=(int)480, framerate=(fraction)25/1 in anything we support
(cb_need_data, 126)#######################
(readTestData, 91)
(readTestData, 102)target frame num: 0, read_ret: 460800
0:00:00.161770500 30661      0xabcff20 WARN           basetransform
gstbasetransform.c:1355:gst_base_transform_setcaps:<capsfilter0> transform
could not transform video/x-raw, format=(string)NV12, width=(int)640,
height=(int)480, framerate=(fraction)25/1 in anything we support
0:00:00.161995625 30661      0xabcff20 WARN           basetransform
gstbasetransform.c:1355:gst_base_transform_setcaps:<capsfilter0> transform
could not transform video/x-raw, format=(string)NV12, width=(int)640,
height=(int)480, framerate=(fraction)25/1 in anything we support
(free_data, 111)
0:00:00.162342000 30661      0xabcff20 WARN                 basesrc
gstbasesrc.c:3055:gst_base_src_loop:<source> error: Internal data stream
error.
0:00:00.162377125 30661      0xabcff20 WARN                 basesrc
gstbasesrc.c:3055:gst_base_src_loop:<source> error: streaming stopped,
reason not-negotiated (-4)
(bus_call, 75)Error: Internal data stream error.
”

my code piece is as following, and the complete source file as attachment,
"
  // video source
  g_object_set (G_OBJECT (videosrc), "num-buffers", 50, NULL);
  GstCaps *capsSource = gst_caps_new_simple("video/x-raw", "format",
G_TYPE_STRING,"NV12",
                  "width", G_TYPE_INT, g_video_width,
                  "height", G_TYPE_INT, g_video_height,
                  "framerate", GST_TYPE_FRACTION, 25, 1,
                  NULL);
  if (!strcmp(g_src_name, "videotestsrc")) {
      DEBUG("uses videotestsrc");
  } else if (!strcmp(g_src_name, "appsrc")) {
    g_signal_connect (videosrc, "need-data", G_CALLBACK (cb_need_data),
NULL);
    g_object_set(G_OBJECT (videosrc), "caps", capsSource, NULL);
  } else {
    ERROR("Not considered yet");
  }
  ret = gst_element_link_filtered(videosrc, videoencode, capsSource);
  gst_caps_unref(capsSource);
  capsSource = NULL;
  if (ret != TRUE) {
      WARN("fail to link elements");
      return -1;
  }"
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