Problem with appsrc to x264enc

[diyin]

My requirement is generate h264 mp4 video from I420 raw data,
I have tested this pipline and it can work,
gst-launch-1.0 multifilesrc location=%04d.yuv ! videoparse format=2
width=3392 height=2008 framerate=25/1 ! videoconvert ! videorate ! x264enc !
mp4mux ! filesink location=out.mp4

But when I use appsrc to replace the multifilesrc in my gst-app，it dose not
work
luanch_src << "appsrc  ! videoparse format=2 width=3392 height=2008
framerate=25/1 ! videoconvert ! videorate ! x264enc ! mp4mux ! filesink
location=ww.mp4";

Here is my push buffer code：
static GstFlowReturn new_sample (GstElement *sink, CustomData *data) {
  GstSample *sample;
  /* Retrieve the buffer */
  g_signal_emit_by_name (sink, "pull-sample", &sample);
  if (sample) {

    GstBuffer *buffer_sink = gst_sample_get_buffer(sample);
    GstMemory *memory = gst_buffer_get_memory(buffer_sink, 0);
    GstMapInfo info;
    gst_memory_map(memory, &info, GST_MAP_READ);


    if (data->sample_num >= 150)
    {
        GstBuffer *buffer_src = gst_buffer_copy_deep(buffer_sink);
        GST_BUFFER_PTS(buffer_src) = gst_util_uint64_scale (data->sample_num
- 150, GST_SECOND, 25);
        GST_BUFFER_TIMESTAMP (buffer_src) = gst_util_uint64_scale
(data->sample_num - 150, GST_SECOND, 25);
        GST_BUFFER_DURATION (buffer_src) = gst_util_uint64_scale (1,
GST_SECOND, 25);

        gst_app_src_push_buffer((GstAppSrc*)data->app_src, buffer_src);
    }

    gst_memory_unmap(memory, &info);
    gst_memory_unref(memory);
    gst_sample_unref (sample);

    data->sample_num++;
    return GST_FLOW_OK;
  }

Is there anything wrong?
Any ideas。Thanks！



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