Data loss of around 1.7 sec at start of every capture

[Ashish Kumar Mishra]

Dear Group Members ,

Our requirement is to create an 5min file for 8hours continuously.
So currently we are doing an pipeline start & stop after every 5min. Below
is the details

 A) We have build an Gst application for :-
        Processor ( TI Netra DM8168)
        Audio ( Stereo 16bit 44.1KHZ)
        Video ( DVI 1080p @ 60hz using TFP401A-EP)
        MUX  (MATROSKA)
        Overlay ( Time )
        Filesink as ".avi"


B) We are loosing around 1.7sec at the start of every capture. Let me
explain
     If we put the pipeline in PLAYING mode at t=0 for total duration of 100
sec , the recordded file has below mentioned status :-
        a) Video from t=0 to t=1.5 sec is not captured in the recorded file
.
        b) The recorded file has first frame of video  from t=1.5 sec to
t=101.5 sec


C)  This data loss of initial 1.5sec is observed every time i start & stop
the engine.

D) The basic flow is :-
     a) Creating the pipeline with the elements and linking them in main
thread .
           gst_bin_add_many(GST_BIN(pipeline), AVIMux, FileSink,NULL);
           gst_bin_add_many(GST_BIN(pipeline), omx_videosrc, clockoverlay,
omx_videoEnc,NULL);
           gst_element_link_many(omx_videosrc, clockoverlay,omx_videoEnc,
AVIMux, NULL);
           gst_bin_add(GST_BIN(pipeline), alsaAudSrc);
           gst_element_link(alsaAudSrc, AVIMux);
           gst_element_link(AVIMux, FileSink);

           if (TRUE != gst_pipeline_set_clock(pipeline,
gst_system_clock_obtain())) {
                printf("gst_pipeline_set_clock(GstSystemClock) did not
work\n");
                nRetVal = FAILURE;
                goto labelExit;
           }



     b) Create an child thread and do the below mentioned activities ( rough
flow ):-
             GSource *bus_source;
             GstBus *bus;
             main_loop_cntxt = g_main_context_new();
             g_main_context_push_thread_default(main_loop_cntxt);
             bus = gst_element_get_bus (pipeline); // Pipeline is created in
parent thread
             bus_source = gst_bus_create_watch (bus);
             g_source_set_callback (bus_source, (GSourceFunc)
gst_bus_async_signal_func, NULL, NULL);
             g_source_attach (bus_source, main_loop_cntxt);
             g_source_unref (bus_source);
             g_signal_connect (G_OBJECT (bus), "message::error",
(GCallback)error_cb, NULL);
             g_signal_connect (G_OBJECT (bus), "message::eos",
(GCallback)eos_cb, NULL);
             main_loop = g_main_loop_new(main_loop_cntxt, FALSE);
             gst_element_set_state (pipeline, GST_STATE_PLAYING);

             if (gst_element_get_state (pipeline, NULL, NULL, (GST_SECOND *
10)) == GST_STATE_CHANGE_FAILURE){
                        goto exit_label;
             }
             g_main_loop_run (main_loop);



So could team members please let me know where should we debug and probable
point of problem.

Thanks ,
Ashish Kumar Mishra 



--
View this message in context: http://gstreamer-devel.966125.n4.nabble.com/Data-loss-of-around-1-7-sec-at-start-of-every-capture-tp4673868.html
Sent from the GStreamer-devel mailing list archive at Nabble.com.