How to sync rtspsrc, appsrc and filesink

[Yuniesky Vasconcelo]

Hi. Thanks in advance.
I want to record a video from an rtsp video camera and at the same time
process the video frame obtained from appsink throught  new-sample signal.
Then, in a separate application I read the video and show the information
related to the frames.

I have this pipeline:
rtspsrc location=rtsp://10.0.0.1:554/video.sdp latency=100 ! rtph264depay !
tee name=t
 ! queue ! vaapidecodebin ! vaapipostproc format=rgba  !  appsink
name=appsink t.
 ! queue ! h264parse ! mp4mux ! filesink sync=false name=filer
location=/home/VideoDB/2017-09-04_16:33:46.mp4

GstFlowReturn GstVideoSourcePrivate::newSample(GstAppSink* sink, gpointer
user_data)
{
        ....
        GstSample* sinkSample =
gst_app_sink_pull_sample(GST_APP_SINK(sink));
        if (sinkSample) {
            GstBuffer* buffer = gst_sample_get_buffer(sinkSample);
            // I need this position to be the same as the recorded video
            GstClockTime pos;
            gst_element_query_position(self->pipeline(), GST_FORMAT_TIME,
&pos);
            ...
        }
        ...
}
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