Unable to set the pipeline to the playing state ...

classic Classic list List threaded Threaded
1 message Options
Reply | Threaded
Open this post in threaded view

Unable to set the pipeline to the playing state ...


Please help me find a solution to this issue:

- I have YUV data file as input and I should output H264 file, using
hardware encoding supported by nvidia Jetson TX2 (omxh264enc).
- I should use c/c++ to write my program.
- I have already done the following line command and I obtain the h264 as
output and I I have succeeded in playing it using vlc.

 gst-launch-1.0 filesrc blocksize=345600 location=Basketball.yuv !
'video/x-raw, width=(int)640, height=(int)360, format=(string)I420,
framerate=(fraction)25/1' ! omxh264enc ! 'video/x-h264,
stream-format=(string)byte-stream' ! filesink

-So now I should convert this command line to a code and replace the filesrc
by an appsrc, but I obtain error when executing it:

    //gcc -Wall $(pkg-config --cflags gstreamer-1.0) YUV_to_H264.c -o
yuvtoh264 $(pkg-config --libs gstreamer-1.0) -lgstapp-1.0

    #include <gst/gst.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <gst/app/gstappsrc.h>

    #define WIDTH 640
    #define HEIGHT 360
    #define BUFFER_SIZE (WIDTH*HEIGHT*3/2)

    /* Structure to contain all our information */
    typedef struct _CustomData {

      GstElement *pipeline, *source, *encoder, *filter, *fsink;
      GMainLoop *loop;
      FILE *yuv_file;    

    } CustomData;

    static void cb_need_data (GstElement *source, guint size, CustomData
      static GstClockTime timestamp = 0;
      char* data_pointer;
      //size_t read_bytes;
      GstBuffer *buffer;
      GstFlowReturn ret;

      data_pointer = (char*)malloc (BUFFER_SIZE);
      g_assert(data_pointer != NULL);
      fread(data_pointer, 1 , BUFFER_SIZE, data->yuv_file);

      buffer = gst_buffer_new_wrapped (data_pointer, BUFFER_SIZE);
      GST_BUFFER_PTS(buffer) = timestamp;
      GST_BUFFER_DTS(buffer) = timestamp;
      //GST_BUFFER_DURATION(buffer) = gst_util_uint64_scale_int (1,
      timestamp += GST_BUFFER_DURATION (buffer);

      g_signal_emit_by_name (source, "push-buffer", buffer, &ret);
      gst_buffer_unref (buffer);

      if (ret != GST_FLOW_OK) {
        g_main_loop_quit (data->loop);

    gint main (gint argc, gchar *argv[])
      CustomData data;
      GstCaps *input_enc_caps, *output_enc_caps;
      GstStateChangeReturn state_ret;
      long yuv_file_size;
      /*Initialize cumstom data structure */
      memset (&data, 0, sizeof (data));

      /* Initialize GStreamer and create the mainloop */
      gst_init (&argc, &argv);
      data.loop = g_main_loop_new (NULL, FALSE);

      /* Create the elements */
      data.source = gst_element_factory_make ("appsrc", "myapp_source");
      data.encoder = gst_element_factory_make ("omxh264enc",
      data.filter = gst_element_factory_make ("capsfilter", "myapp_filter");
      data.fsink = gst_element_factory_make ("filesink", "myapp_sink");

      /* Create the empty pipeline */
      data.pipeline = gst_pipeline_new ("myapp_pipeline");

      if (!data.pipeline || !data.source || !data.encoder || !data.filter
    || !data.fsink)
        g_printerr ("Not all elements could be created.\n");
        return -1;

      /* Get a pointer to the YUV input file*/
      data.yuv_file = fopen("/media/ubuntu/6634-3132/Basketball.yuv", "rb");
      g_assert(data.yuv_file != NULL);

      /* Obtain the YUV file size */
      fseek (data.yuv_file , 0 , SEEK_END);
      yuv_file_size = ftell (data.yuv_file);
      rewind (data.yuv_file);
      //printf("\n %ld);

      /* Configure source, filter and fsink */
      input_enc_caps = gst_caps_new_simple ("video/x-raw",
                         "format", G_TYPE_STRING, "I420",
                         "width", G_TYPE_INT, WIDTH,
                         "height", G_TYPE_INT, HEIGHT,
                         "framerate", GST_TYPE_FRACTION, 25, 1, NULL);

      output_enc_caps = gst_caps_new_simple ("video/x-h264",
        "stream-format", G_TYPE_STRING, "byte-stream", NULL);

      g_object_set (G_OBJECT (data.source), "caps", input_enc_caps,
      "stream-type", 2,
      "format", GST_FORMAT_BYTES,
      "size", (gint64)(yuv_file_size), NULL);
      g_signal_connect (data.source, "need-data", G_CALLBACK (cb_need_data),

      g_object_set (G_OBJECT (data.filter), "caps", output_enc_caps, NULL);
      g_object_set (G_OBJECT (data.fsink), "location",
    "/media/ubuntu/6634-3132/Basketball.h264", NULL);

      gst_caps_unref (input_enc_caps);
      gst_caps_unref (output_enc_caps);
      //gint64 out_size = gst_app_src_get_size(data.source);
      //g_print("%" G_GINT64_FORMAT, out_size);

      /* Link all elements that can be automatically linked*/
      gst_bin_add_many (GST_BIN (data.pipeline), data.source, data.encoder,
    data.filter, data.fsink, NULL);

      if ((gst_element_link_many (data.source, data.encoder, data.filter,
    data.fsink, NULL)) != TRUE )
        g_printerr ("Elements could not be linked.\n");
        gst_object_unref (data.pipeline);
        return -1;

      /* Start playing the pipeline */
      state_ret = gst_element_set_state (data.pipeline, GST_STATE_PLAYING);
      //g_assert(state_ret == GST_STATE_CHANGE_ASYNC);
      if (state_ret == GST_STATE_CHANGE_FAILURE) {
      g_printerr ("Unable to set the pipeline to the playing state.\n");
      gst_object_unref (data.pipeline);
      return -1;

      /* Set the MainLoop to run */
      g_main_loop_run (data.loop);

      /* clean up */
      fclose (data.yuv_file);
      gst_element_set_state (data.pipeline, GST_STATE_NULL);
      gst_object_unref (GST_OBJECT (data.pipeline));
      g_main_loop_unref (data.loop);

      return 0;

ubuntu@tegra-ubuntu:~/Desktop$ ./yuvtoh264
Inside NvxLiteH264DecoderLowLatencyInitNvxLiteH264DecoderLowLatencyInit set
DPB and MjstreamingInside
NvxLiteH265DecoderLowLatencyInitNvxLiteH265DecoderLowLatencyInit set DPB and
MjstreamingUnable to set the pipeline to the playing state.

Thanks to help to resolve the isuue.


Sent from: http://gstreamer-devel.966125.n4.nabble.com/
gstreamer-devel mailing list
[hidden email]