Memory leak problem with play/pause gstreamer's pipeline on Jetson TK1

In my project i have to play/pause some gstreamer’s pipeline.

The problem is huge memory leak (around 100 MB per each play/pause iteration).
Here i have demo program, that reproduce the leak. Looks like the reason of the leak is omxh264enc. If i delete line 11 from the demo program, memory leak disappears.

May you suggest some decision or workaround for me?

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <thread>
#include <gst/gst.h>

std::string strWeb
          "appsrc name=source !"
          "video/x-raw, format=I420, width=3840, height=2160, framerate=2/1 !"
          "omxh264enc ! " // looks like memory leak reason is in this line !!!!!

bool white = true;

GstClockTime g_timestamp;

static void cb_need_data( GstElement * appsrc, guint unused_size, gpointer data )
    GstBuffer *buffer;
    guint size;
    GstFlowReturn ret;

    size = 3840 * 2160 * 2;
    buffer = gst_buffer_new_allocate (NULL, size, NULL);
    gst_buffer_memset (buffer, 0, white ? 0xff : 0x0, size);
    white = !white;

    /* increment the g_timestamp every 1/2 second */
    GST_BUFFER_PTS (buffer) = g_timestamp;
    GST_BUFFER_DURATION (buffer) = gst_util_uint64_scale_int (1, GST_SECOND, 2);
    g_timestamp += GST_BUFFER_DURATION (buffer);

    g_signal_emit_by_name (appsrc, "push-buffer", buffer, &ret);

    printf("need data\n");

int main()
    GstElement *appsrc;
    GMainLoop *g_loop;
    GError *err = NULL;
    g_timestamp = 0;

    g_loop = g_main_loop_new(NULL, FALSE);
    gst_init(NULL, NULL);
    GstElement *element = gst_parse_launch(strWeb.c_str(), &err);
    if (!element)
        printf("appsrc error - %s\n", err->message);
        return 1;

    appsrc = gst_bin_get_by_name(GST_BIN(element), "source");
    if (!appsrc)
        printf("appsrc error\n");
        return 1;
    g_signal_connect (appsrc, "need-data", G_CALLBACK(cb_need_data), NULL);

    std::thread thread([&]()

    for (int i = 0; i < 100; i++)
        gst_element_set_state (element, GST_STATE_PLAYING);
        gst_element_set_state (element, GST_STATE_NULL);
        printf("rerun %d\n", i);
    return 0;

hi @Aleksandr

Welcome to the Toradex Community!!!

Could you provide version of the hardware and software ( uname -r ) of your module?
Have you done any changes to the Software? If yes, please share these changes.

@jaski.tx , thank you for answer.
I just install last “Linux For Tegra Image” from official site (no changes was made).

ubuntu@tegra-ubuntu:~/mem_test$ uname -r
ubuntu@tegra-ubuntu:~/mem_test$ cat /etc/nv_tegra_release 
# R21 (release), REVISION: 7.0, GCID: 11364392, BOARD: ardbeg, EABI: hard, DATE: Tue May 29 20:15:12 UTC 2018

Hardware is Apalis TK1 with Apalis Evaluation Board Rev 1.1.!

It seems to a known issue which is discussed on Nvidia Forum too.

As a workaround you could try to play/pause with gstreamer in a separate process.