Problem with appsrc-x264enc-appsink

[Valentine]

*Hi, 

When I try the following script, it does not work : the sample of appsink is
empty. Nevertheless, when I link "videotestsrc" to
"videoconvert-x264enc-appsink" directly, it works and when I connect
"appsrc" to "appsink" direcly, it works too... What is the problem ? Thank
you.*

gst_init(NULL,NULL); 

    GstElement *pipeline2; 
    pipeline2 = gst_pipeline_new("pipeline"); 
    GstElement *appsink2; 
    appsink2 = gst_element_factory_make("appsink", "BufferSink2"); 
    GstElement *videotestsrc = gst_element_factory_make("videotestsrc",
"source"); 
    g_object_set(G_OBJECT(videotestsrc), "num-buffers", 1, NULL); 
    gst_bin_add_many(GST_BIN(pipeline2), videotestsrc, appsink2, NULL); 
    GstCaps *caps2 = gst_caps_new_simple("video/x-raw", "format",
G_TYPE_STRING, "GRAY8", "width", G_TYPE_INT, 100, "height", G_TYPE_INT, 100,
NULL); 
    gst_element_link_filtered(videotestsrc, appsink2, caps2); 
    GstStateChangeReturn retPip2 = gst_element_set_state(pipeline2,
GST_STATE_PLAYING); 

    GstSample *sample2 = gst_app_sink_pull_sample (GST_APP_SINK(appsink2)); 
    GstBuffer *buffer2= gst_sample_get_buffer(sample2); 
    GstMapInfo map2; 
    gst_buffer_map(buffer2, &map2, GST_MAP_READ); 
    uchar source[map2.size]; 
    memmove(source, map2.data, map2.size); 


    //////// 

    int size = map2.size; 
    GstFlowReturn ret; 
    GstElement *appsrc; 
    appsrc = gst_element_factory_make("appsrc", "appsrc"); 
    g_object_set(G_OBJECT(appsrc), "blocksize", size, NULL); 
    g_object_set(G_OBJECT(appsrc), "num-buffers", 1, NULL); 

    GstBuffer *buffer; 
    buffer = gst_buffer_new_allocate(NULL,size, NULL); 
    GstMapInfo map; 
    gst_buffer_map(buffer, &map, GST_MAP_WRITE); 
    uchar *buf = map.data; 
    memcpy(buf, source, size); 
    ret = gst_app_src_push_buffer(GST_APP_SRC(appsrc), buffer); 

    g_object_set(G_OBJECT(appsrc), "caps",
gst_caps_new_simple("video/x-raw", "format", G_TYPE_STRING, "GRAY8",
"width", G_TYPE_INT, 100, "height", G_TYPE_INT, 100, NULL), NULL); 
    //g_object_set(G_OBJECT(appsrc), "stream-type", 0, "format", 3, "size",
size, NULL); 


    GstCaps *cap_appsrc_to_x264enc; 
    cap_appsrc_to_x264enc = gst_caps_new_simple("video/x-raw", "format",
G_TYPE_STRING, "GRAY8", "width", G_TYPE_INT, 100, "height", G_TYPE_INT, 100,
NULL); 

    GstCaps *cap_x264enc_to_sink; 
    cap_x264enc_to_sink = gst_caps_new_simple("video/x-h264", "profile",
G_TYPE_STRING, "main", NULL); 

    GstElement *x264enc = gst_element_factory_make("x264enc", "encoder"); 

    g_object_set(G_OBJECT(x264enc), "qp-max", 20, NULL); 


    g_object_set(G_OBJECT(x264enc), "pass", 17, NULL); // VBR Pass 1 

    g_object_set(G_OBJECT(x264enc), "bitrate", 2000, NULL); 

    GstCaps *caps; 
    caps = gst_caps_new_simple("video/x-raw", "format", G_TYPE_STRING,
"I420", NULL); 

    GstElement *appsink; 
    appsink = gst_element_factory_make("appsink", "BufferSink"); 

    GstElement *convert = gst_element_factory_make("videoconvert",
"convert"); 

    GstElement *pipeline; 
    pipeline = gst_pipeline_new("pipeline"); 


    gst_bin_add_many(GST_BIN(pipeline), appsrc, convert, x264enc, appsink,
NULL); 
    gst_element_link_filtered(appsrc, convert, cap_appsrc_to_x264enc); 
    gst_element_link_filtered(convert, x264enc, caps); 
    gst_element_link_filtered(x264enc,appsink, cap_x264enc_to_sink); 

    GstStateChangeReturn retPip = gst_element_set_state(pipeline,
GST_STATE_PLAYING); 


    GstSample *sample = gst_app_sink_pull_sample (GST_APP_SINK(appsink)); 
    GstBuffer *encBuffer= gst_sample_get_buffer(sample); 
    gsize senc = gst_buffer_get_size (encBuffer); 
    GstMapInfo mapEnc; 
    gst_buffer_map(encBuffer, &mapEnc, GST_MAP_READ); 
    uchar pRet[mapEnc.size]; 
    printf("%d\n", mapEnc.size); 
    memmove(pRet, mapEnc.data, mapEnc.size); 



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