如何修复“ GStreamer-CRITICAL **:gst_sample_get_buffer:断言'GST_IS_SAMPLE(sample)'失败”

时间:2019-04-01 11:30:06

标签: c++ linux qt ubuntu gstreamer

我想通过gstreamer捕获视频帧并在我的应用程序上显示(使用Qt),但是遇到一些问题:

当我尝试使用GstAppSink(gst_app_sink_pull_sample)时,它一直返回NULL,这是我不理解的。我可以完美地使用终端(gst-launch-1.0)流式传输视频。

下面是我的代码:

void gstreamer::openStream()
{
    pipeline = gst_parse_launch ("rtspsrc location=rtsp://192.168.10.123 ! rtph264depay ! h264parse ! queue ! avdec_h264 ! xvimagesink sync=false async=false appsink name=mysink", NULL);

    GstElement* sink = gst_bin_get_by_name(GST_BIN(pipeline), "mysink");

    GstAppSink* appsink = GST_APP_SINK(sink);

    if(!appsink)
    {
        qDebug() << "get app sink failed";
    }
    else
    {
        qDebug() << "app sink pass";
        mAppSink = appsink;

        openSample();
    }
}

void gstreamer::openSample()
{

    if(!mAppSink)
    {
        qDebug() << "appsink failed";
    }
    GstSample* gstSample = gst_app_sink_pull_sample(mAppSink);

    if(gstSample == NULL)
    {
        qDebug() << "sample failed ";
    }
    else{
        qDebug() << "sample pass";
    }

    GstBuffer* buffer = gst_sample_get_buffer(gstSample);
    if(!buffer)
    {
        qDebug() << "buffer fail";
    }

    GstMapInfo map;

    gst_buffer_map(buffer, &map, GST_MAP_READ);


    QImage image = QImage((map.data), 320, 240, QImage::Format_RGB888);
    emit sendFrame(image);
}

我试图在网络上找到该问题,但是几乎没有任何链接。

1 个答案:

答案 0 :(得分:-1)

尝试将管道更改为 “ rtspsrc位置= rtsp://192.168.10.123!rtph264depay!h264parse!发球名称= my_tee!队列!avdec_h264!xvimagesink sync = false my_tee。!队列!appsink async = false name = mysink”