Not able to use Tee plugin - Frames are frozen in the sink window

Issue: I modified the C sample app inside the deepstream sdk to accomodate a Tee plugin. My objective is to have one side of the Tee to have inference pipeline and show inferred output just as the sample app does. Other side of the tee should show the raw video.

But when i added the tee plugin and ran the app, the frames are just frozen. Help me resolve this issue.

I have added my code below.

Hardware platform: x86_64
Deepstream SDK : 5.1 (Devel container from NGC)

/*
 * Copyright (c) 2018-2019, NVIDIA CORPORATION. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include <gst/gst.h>
#include <glib.h>
#include <stdio.h>
#include "gstnvdsmeta.h"

#define MAX_DISPLAY_LEN 64

#define PGIE_CLASS_ID_VEHICLE 0
#define PGIE_CLASS_ID_PERSON 2

/* The muxer output resolution must be set if the input streams will be of
 * different resolution. The muxer will scale all the input frames to this
 * resolution. */
#define MUXER_OUTPUT_WIDTH 1920
#define MUXER_OUTPUT_HEIGHT 1080

/* Muxer batch formation timeout, for e.g. 40 millisec. Should ideally be set
 * based on the fastest source's framerate. */
#define MUXER_BATCH_TIMEOUT_USEC 4000000

gint frame_number = 0;
gchar pgie_classes_str[4][32] = { "Vehicle", "TwoWheeler", "Person",
  "Roadsign"
};

/* osd_sink_pad_buffer_probe  will extract metadata received on OSD sink pad
 * and update params for drawing rectangle, object information etc. */

static GstPadProbeReturn
osd_sink_pad_buffer_probe (GstPad * pad, GstPadProbeInfo * info,
    gpointer u_data)
{
    GstBuffer *buf = (GstBuffer *) info->data;
    guint num_rects = 0; 
    NvDsObjectMeta *obj_meta = NULL;
    guint vehicle_count = 0;
    guint person_count = 0;
    NvDsMetaList * l_frame = NULL;
    NvDsMetaList * l_obj = NULL;
    NvDsDisplayMeta *display_meta = NULL;

    NvDsBatchMeta *batch_meta = gst_buffer_get_nvds_batch_meta (buf);

    for (l_frame = batch_meta->frame_meta_list; l_frame != NULL;
      l_frame = l_frame->next) {
        NvDsFrameMeta *frame_meta = (NvDsFrameMeta *) (l_frame->data);
        int offset = 0;
        for (l_obj = frame_meta->obj_meta_list; l_obj != NULL;
                l_obj = l_obj->next) {
            obj_meta = (NvDsObjectMeta *) (l_obj->data);
            if (obj_meta->class_id == PGIE_CLASS_ID_VEHICLE) {
                vehicle_count++;
                num_rects++;
            }
            if (obj_meta->class_id == PGIE_CLASS_ID_PERSON) {
                person_count++;
                num_rects++;
            }
        }
        display_meta = nvds_acquire_display_meta_from_pool(batch_meta);
        NvOSD_TextParams *txt_params  = &display_meta->text_params[0];
        display_meta->num_labels = 1;
        txt_params->display_text = g_malloc0 (MAX_DISPLAY_LEN);
        offset = snprintf(txt_params->display_text, MAX_DISPLAY_LEN, "Person = %d ", person_count);
        offset = snprintf(txt_params->display_text + offset , MAX_DISPLAY_LEN, "Vehicle = %d ", vehicle_count);

        /* Now set the offsets where the string should appear */
        txt_params->x_offset = 10;
        txt_params->y_offset = 12;

        /* Font , font-color and font-size */
        txt_params->font_params.font_name = "Serif";
        txt_params->font_params.font_size = 10;
        txt_params->font_params.font_color.red = 1.0;
        txt_params->font_params.font_color.green = 1.0;
        txt_params->font_params.font_color.blue = 1.0;
        txt_params->font_params.font_color.alpha = 1.0;

        /* Text background color */
        txt_params->set_bg_clr = 1;
        txt_params->text_bg_clr.red = 0.0;
        txt_params->text_bg_clr.green = 0.0;
        txt_params->text_bg_clr.blue = 0.0;
        txt_params->text_bg_clr.alpha = 1.0;

        nvds_add_display_meta_to_frame(frame_meta, display_meta);
    }

    g_print ("Frame Number = %d Number of objects = %d "
            "Vehicle Count = %d Person Count = %d\n",
            frame_number, num_rects, vehicle_count, person_count);
    frame_number++;
    return GST_PAD_PROBE_OK;
}

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 *error;
      gst_message_parse_error (msg, &error, &debug);
      g_printerr ("ERROR from element %s: %s\n",
          GST_OBJECT_NAME (msg->src), error->message);
      if (debug)
        g_printerr ("Error details: %s\n", debug);
      g_free (debug);
      g_error_free (error);
      g_main_loop_quit (loop);
      break;
    }
    default:
      break;
  }
  return TRUE;
}

int
main (int argc, char *argv[])
{
  GMainLoop *loop = NULL;
  GstElement *pipeline = NULL, *source = NULL, *h264parser = NULL,
      *decoder = NULL, *streammux = NULL, *sink = NULL, *pgie = NULL, *nvvidconv = NULL, *tee=NULL, *que1=NULL, *que2=NULL, *sink2=NULL,*avdec=NULL,*nvvidconv2=NULL,
      *nvosd = NULL;
#ifdef PLATFORM_TEGRA
  GstElement *transform = NULL;
#endif
  GstBus *bus = NULL;
  guint bus_watch_id;
  GstPad *osd_sink_pad = NULL;

  /* Check input arguments */
  if (argc != 2) {
    g_printerr ("Usage: %s <H264 filename>\n", argv[0]);
    return -1;
  }

  /* Standard GStreamer initialization */
  gst_init (&argc, &argv);
  loop = g_main_loop_new (NULL, FALSE);

  /* Create gstreamer elements */
  /* Create Pipeline element that will form a connection of other elements */
  pipeline = gst_pipeline_new ("dstest1-pipeline");

  /* Source element for reading from the file */
  source = gst_element_factory_make ("filesrc", "file-source");

  /* Since the data format in the input file is elementary h264 stream,
   * we need a h264parser */
  h264parser = gst_element_factory_make ("h264parse", "h264-parser");

  /* Use nvdec_h264 for hardware accelerated decode on GPU */
  decoder = gst_element_factory_make ("nvv4l2decoder", "nvv4l2-decoder");

  tee = gst_element_factory_make("tee","tee");

  que1 = gst_element_factory_make("queue","que1");

  que2 = gst_element_factory_make("queue","que2");

  nvvidconv2 = gst_element_factory_make("videoconvert", NULL);

  avdec = gst_element_factory_make("avdech264",NULL);

  /* Create nvstreammux instance to form batches from one or more sources. */
  streammux = gst_element_factory_make ("nvstreammux", "stream-muxer");

  if (!pipeline || !streammux) {
    g_printerr ("One element could not be created. Exiting.\n");
    return -1;
  }

  /* Use nvinfer to run inferencing on decoder's output,
   * behaviour of inferencing is set through config file */
  pgie = gst_element_factory_make ("nvinfer", "primary-nvinference-engine");

  /* Use convertor to convert from NV12 to RGBA as required by nvosd */
  nvvidconv = gst_element_factory_make ("nvvideoconvert", "nvvideo-converter");

  /* Create OSD to draw on the converted RGBA buffer */
  nvosd = gst_element_factory_make ("nvdsosd", "nv-onscreendisplay");

  /* Finally render the osd output */
#ifdef PLATFORM_TEGRA
  transform = gst_element_factory_make ("nvegltransform", "nvegl-transform");
#endif
  sink = gst_element_factory_make ("nveglglessink", "nvvideo-renderer");
  sink2 = gst_element_factory_make("autovideosink", NULL);

  if (!source || !h264parser || !decoder || !pgie || !tee || !que1 || !que2
      || !nvvidconv || !nvosd || !sink || !sink2 || !nvvidconv2) {
    g_printerr ("One element could not be created. Exiting.\n");
    return -1;
  }

#ifdef PLATFORM_TEGRA
  if(!transform) {
    g_printerr ("One tegra element could not be created. Exiting.\n");
    return -1;
  }
#endif

  /* we set the input filename to the source element */
  g_object_set (G_OBJECT (source), "location", argv[1], NULL);

  g_object_set (G_OBJECT (streammux), "width", MUXER_OUTPUT_WIDTH, "height",
      MUXER_OUTPUT_HEIGHT, "batch-size", 1,
      "batched-push-timeout", MUXER_BATCH_TIMEOUT_USEC, NULL);

  /* Set all the necessary properties of the nvinfer element,
   * the necessary ones are : */
  g_object_set (G_OBJECT (pgie),
      "config-file-path", "dstest1_pgie_config.txt", NULL);

  /* we add a message handler */
  bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
  bus_watch_id = gst_bus_add_watch (bus, bus_call, loop);
  gst_object_unref (bus);

  /* Set up the pipeline */
  /* we add all elements into the pipeline */
#ifdef PLATFORM_TEGRA
  gst_bin_add_many (GST_BIN (pipeline),
      source, h264parser, decoder, streammux, pgie,
      nvvidconv, nvosd, transform, sink, NULL);
#else
  gst_bin_add_many (GST_BIN (pipeline),
      source, h264parser, decoder, streammux, pgie, tee, que1, que2, nvvidconv2,
      nvvidconv, nvosd, sink, sink2, avdec, NULL);
#endif

  GstPad *sinkpad, *srcpad;
  gchar pad_name_sink[16] = "sink_0";
  gchar pad_name_src[16] = "src";

  sinkpad = gst_element_get_request_pad (streammux, pad_name_sink);
  if (!sinkpad) {
    g_printerr ("Streammux request sink pad failed. Exiting.\n");
    return -1;
  }

  srcpad = gst_element_get_static_pad (decoder, pad_name_src);
  if (!srcpad) {
    g_printerr ("Decoder request src pad failed. Exiting.\n");
    return -1;
  }

  if (gst_pad_link (srcpad, sinkpad) != GST_PAD_LINK_OK) {
      g_printerr ("Failed to link decoder to stream muxer. Exiting.\n");
      return -1;
  }

  gst_object_unref (sinkpad);
  gst_object_unref (srcpad);

  /* we link the elements together */
  /* file-source -> h264-parser -> nvh264-decoder ->
   * nvinfer -> nvvidconv -> nvosd -> video-renderer */

  if (!gst_element_link_many (source, h264parser,tee, que1, decoder, NULL)) {
    g_printerr ("Elements could not be linked: 1. Exiting.\n");
    return -1;
  }
  if (!gst_element_link_many (tee, que2,avdec, nvvidconv2, sink2, NULL)) {
    g_printerr ("Second pipeline Elements could not be linked: 1. Exiting.\n");
    return -1;
  }

#ifdef PLATFORM_TEGRA
  if (!gst_element_link_many (streammux, pgie,
      nvvidconv, nvosd, transform, sink, NULL)) {
    g_printerr ("Elements could not be linked: 2. Exiting.\n");
    return -1;
  }
#else
  if (!gst_element_link_many (streammux, pgie,
      nvvidconv, nvosd, sink, NULL)) {
    g_printerr ("Elements could not be linked: 2. Exiting.\n");
    return -1;
  }
#endif

  /* Lets add probe to get informed of the meta data generated, we add probe to
   * the sink pad of the osd element, since by that time, the buffer would have
   * had got all the metadata. */
  osd_sink_pad = gst_element_get_static_pad (nvosd, "sink");
  if (!osd_sink_pad)
    g_print ("Unable to get sink pad\n");
  else
    gst_pad_add_probe (osd_sink_pad, GST_PAD_PROBE_TYPE_BUFFER,
        osd_sink_pad_buffer_probe, NULL, NULL);

  /* Set the pipeline to "playing" state */
  g_print ("Now playing: %s\n", argv[1]);
  gst_element_set_state (pipeline, GST_STATE_PLAYING);

  /* Wait till pipeline encounters an error or EOS */
  g_print ("Running...\n");
  g_main_loop_run (loop);

  /* Out of the main loop, clean up nicely */
  g_print ("Returned, stopping playback\n");
  gst_element_set_state (pipeline, GST_STATE_NULL);
  g_print ("Deleting pipeline\n");
  gst_object_unref (GST_OBJECT (pipeline));
  g_source_remove (bus_watch_id);
  g_main_loop_unref (loop);
  return 0;
}

Please provide complete information as applicable to your setup.

• TensorRT Version
• NVIDIA GPU Driver Version (valid for GPU only)

My TensorRT version is 7.2.2-1 + Cuda 11.1

Nvidia GPU driver version: 470.57.02

Please let me know if any other details are required

@Morganh Hi, Can you help me resolve this issue.

Hi,

try to add sink after the decoder in the following part:

if (!gst_element_link_many (source, h264parser,tee, que1, decoder, NULL)) {
g_printerr (“Elements could not be linked: 1. Exiting.\n”);
return -1;
}

Hi @msh3llah ,

Yes I had already linked separate sink for both pipelines namely “sink1” and “sink”. Please check the following part of the code.

sinkpad = gst_element_get_request_pad (streammux, pad_name_sink);
  if (!sinkpad) {
    g_printerr ("Streammux request sink pad failed. Exiting.\n");
    return -1;
  }

  srcpad = gst_element_get_static_pad (decoder, pad_name_src);
  if (!srcpad) {
    g_printerr ("Decoder request src pad failed. Exiting.\n");
    return -1;
  }

  if (gst_pad_link (srcpad, sinkpad) != GST_PAD_LINK_OK) {
      g_printerr ("Failed to link decoder to stream muxer. Exiting.\n");
      return -1;
  }

  gst_object_unref (sinkpad);
  gst_object_unref (srcpad);

  /* we link the elements together */
  /* file-source -> h264-parser -> nvh264-decoder ->
   * nvinfer -> nvvidconv -> nvosd -> video-renderer */

  if (!gst_element_link_many (source, h264parser,tee, que1, decoder, NULL)) {
    g_printerr ("Elements could not be linked: 1. Exiting.\n");
    return -1;
  }
  if (!gst_element_link_many (tee, que2,avdec, nvvidconv2, sink2, NULL)) {
    g_printerr ("Second pipeline Elements could not be linked: 1. Exiting.\n");
    return -1;
  }

#ifdef PLATFORM_TEGRA
  if (!gst_element_link_many (streammux, pgie,
      nvvidconv, nvosd, transform, sink, NULL)) {
    g_printerr ("Elements could not be linked: 2. Exiting.\n");
    return -1;
  }
#else
  if (!gst_element_link_many (streammux, pgie,
      nvvidconv, nvosd, sink, NULL)) {
    g_printerr ("Elements could not be linked: 2. Exiting.\n");
    return -1;
  }