Example code for muxing klv (meta/x-klv) with mpegtsmux (plugins-bad) and GStreamer 1.8.3

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Example code for muxing klv (meta/x-klv) with mpegtsmux (plugins-bad) and GStreamer 1.8.3

Jean-Sébastien Bilodeau
Hi,

I have unsuccessfully looked for examples code of the mpegtsmux plugins to mux KLV metadata in a video.
https://github.com/GStreamer/gst-plugins-bad/tree/master/tests/examples

I also search for a response on the mailing list archives to my questioning without success.
https://lists.freedesktop.org/archives/gstreamer-devel/2015-December/055789.html
https://lists.freedesktop.org/archives/gstreamer-devel/2016-February/056957.html

So, how to embed klv into mpegts stream?

If someone is able to tell me the changes to make to the code to mux the KLV metadata and save them in a video file, here is my sample code that records a video stream (h264) with mpegtsmux from a webcam using GStreamer 1.8.3:

#include <string.h>
#include <gst/gst.h>
#include <signal.h>
#include <unistd.h>
#include <stdlib.h>
#include <iostream>

static GMainLoop *loop;
static GstElement *pipeline, *appsrc, *src, *tee, *encoder, *muxer, *filesink, *videoconvert, *videosink, *queue_record, *queue_display, *caps_filter, *capsfilter_klv;
static GstBus *bus;

/* KLV data from Day_Flight.mpg */
static const guint8 rtp_KLV_frame_data[] = {
  0x06, 0x0e, 0x2b, 0x34, 0x02, 0x0b, 0x01, 0x01,
  0x0e, 0x01, 0x03, 0x01, 0x01, 0x00, 0x00, 0x00,
  0x81, 0x91, 0x02, 0x08, 0x00, 0x04, 0x6c, 0x8e,
  0x20, 0x03, 0x83, 0x85, 0x41, 0x01, 0x01, 0x05,
  0x02, 0x3d, 0x3b, 0x06, 0x02, 0x15, 0x80, 0x07,
  0x02, 0x01, 0x52, 0x0b, 0x03, 0x45, 0x4f, 0x4e,
  0x0c, 0x0e, 0x47, 0x65, 0x6f, 0x64, 0x65, 0x74,
  0x69, 0x63, 0x20, 0x57, 0x47, 0x53, 0x38, 0x34,
  0x0d, 0x04, 0x4d, 0xc4, 0xdc, 0xbb, 0x0e, 0x04,
  0xb1, 0xa8, 0x6c, 0xfe, 0x0f, 0x02, 0x1f, 0x4a,
  0x10, 0x02, 0x00, 0x85, 0x11, 0x02, 0x00, 0x4b,
  0x12, 0x04, 0x20, 0xc8, 0xd2, 0x7d, 0x13, 0x04,
  0xfc, 0xdd, 0x02, 0xd8, 0x14, 0x04, 0xfe, 0xb8,
  0xcb, 0x61, 0x15, 0x04, 0x00, 0x8f, 0x3e, 0x61,
  0x16, 0x04, 0x00, 0x00, 0x01, 0xc9, 0x17, 0x04,
  0x4d, 0xdd, 0x8c, 0x2a, 0x18, 0x04, 0xb1, 0xbe,
  0x9e, 0xf4, 0x19, 0x02, 0x0b, 0x85, 0x28, 0x04,
  0x4d, 0xdd, 0x8c, 0x2a, 0x29, 0x04, 0xb1, 0xbe,
  0x9e, 0xf4, 0x2a, 0x02, 0x0b, 0x85, 0x38, 0x01,
  0x2e, 0x39, 0x04, 0x00, 0x8d, 0xd4, 0x29, 0x01,
  0x02, 0x1c, 0x5f
};

static gboolean
message_cb (GstBus * bus, GstMessage * message, gpointer user_data)
{
  switch (GST_MESSAGE_TYPE (message)) {
    case GST_MESSAGE_ERROR:{
      g_main_loop_quit (loop);

      GError *err = NULL;
      gchar *name, *debug = NULL;
      name = gst_object_get_path_string (message->src);
      gst_message_parse_error (message, &err, &debug);

      std::string err_message = err->message;
      if(err_message == "Output window was closed"){
          std::cout << std::endl << err_message << std::endl;
      }
      else{
          g_printerr ("\nERROR: from element %s: %s\n", name, err->message);
          if (debug != NULL)
              g_printerr ("Additional debug info:\n%s\n", debug);
      }

      g_error_free (err);
      g_free (debug);
      g_free (name);
      break;
    }
    case GST_MESSAGE_WARNING:{
        GError *err = NULL;
        gchar *name, *debug = NULL;

        name = gst_object_get_path_string (message->src);
        gst_message_parse_warning (message, &err, &debug);

        g_printerr ("ERROR: from element %s: %s\n", name, err->message);
        if (debug != NULL)
        g_printerr ("Additional debug info:\n%s\n", debug);

        g_error_free (err);
        g_free (debug);
        g_free (name);
        break;
    }
    case GST_MESSAGE_EOS: {
        g_print ("Got EOS\n");
        g_main_loop_quit(loop);
        break;
    }
    default:
        break;
  }

  return TRUE;
}
void need_data(GstElement* element, guint, gpointer userData)
{
    std::cout << "need_data" << std::endl;
    // TODO push binary data (rtp_KLV_frame_data) in Big-Endian.
}
void sigintHandler(int unused)
{
    g_print("You ctrl-c-ed!");
    gst_element_send_event(pipeline, gst_event_new_eos());
}
int main(int argc, char *argv[])
{
    signal(SIGINT, sigintHandler);
    gst_init (&argc, &argv);

    guint major, minor, micro, nano;
    gst_version (&major, &minor, &micro, &nano);
    std::string nano_str = nano==1 ? "(CVS)" : (nano==2 ? "(Prerelease)" : "");
    std::cout << "This program is linked against GStreamer " << major << "." << minor<< "." << micro << " " << nano_str << std::endl;

    pipeline = gst_pipeline_new(NULL);
    appsrc = gst_element_factory_make ("appsrc", "source");
    src = gst_element_factory_make("v4l2src", NULL);
    tee = gst_element_factory_make("tee", "tee");
    encoder = gst_element_factory_make("x264enc", NULL);
    muxer = gst_element_factory_make("mpegtsmux", NULL);
    filesink = gst_element_factory_make("filesink", NULL);
    videoconvert = gst_element_factory_make("videoconvert", NULL);
    videosink = gst_element_factory_make("autovideosink", NULL);
    queue_display = gst_element_factory_make("queue", "queue_display");
    queue_record = gst_element_factory_make("queue", "queue_record");
    caps_filter  = gst_element_factory_make("capsfilter", NULL);
    capsfilter_klv = gst_element_factory_make("capsfilter", NULL);

    if (!pipeline || !src || !tee || !encoder || !muxer || !filesink || !videoconvert || !videosink || !queue_record || !queue_display) {
            std::cerr << "Failed to create elements:"
                  << (!pipeline? " pipeline " : "")
                  << (!src? " v4l2src " : "")
                  << (!tee? " tee " : "")
                 << (!encoder? " x264enc " : "")
                 << (!muxer? " mpegtsmux " : "")
                 << (!filesink? " filesink " : "")
                 << (!videoconvert? " videoconvert " : "")
                 << (!videosink? " autovideosink " : "")
                 << (!queue_display? " queue_display " : "")
                 << (!queue_record? " queue_record " : "")
                 << std::endl;
            return -1;
        }

    // Create caps
    /*GstCaps *video_cap = gst_caps_new_simple ("video/x-raw",
                         "width", G_TYPE_INT, 640,
                         "height", G_TYPE_INT, 480,
                         "framerate", GST_TYPE_FRACTION, 30, 1,
                         NULL);*/
    GstCaps *klv_caps = gst_caps_new_simple("meta/x-klv", "parsed", G_TYPE_BOOLEAN, TRUE, "sparse", G_TYPE_BOOLEAN, TRUE, nullptr);
    GstCaps *caps = gst_caps_new_full (
              gst_structure_new ("video/x-raw",
                     "width", G_TYPE_INT, 640,
                     "height", G_TYPE_INT, 480,
                     "framerate", GST_TYPE_FRACTION, 30, 1,
                     NULL),
              gst_structure_new ("meta/x-klv",
                     "parsed", G_TYPE_BOOLEAN, TRUE,
                     "sparse", G_TYPE_BOOLEAN, TRUE,
                     NULL),
              NULL);

    g_object_set(appsrc, "caps", klv_caps, nullptr);
    g_object_set(appsrc, "format", GST_FORMAT_TIME, nullptr);

    g_object_set (src, "device", "/dev/video0", NULL);
    g_object_set (encoder, "noise-reduction", 10000, NULL);
    //g_object_set (encoder, "tune", "Zero latency", NULL);
    g_object_set (encoder, "threads", 4, NULL);
    g_object_set(filesink, "location", "/home/jean/Desktop/rec.mpg", NULL);
    g_object_set(filesink, "async", 0, NULL);
    g_object_set(caps_filter, "caps", caps, NULL);
    //g_object_set(capsfilter_klv, "caps", klv_caps, NULL);
    gst_caps_unref(caps);
    //gst_caps_unref(klv_caps);

    gst_bin_add_many(GST_BIN(pipeline), src, caps_filter, tee, queue_record, encoder, muxer, filesink, queue_display, videoconvert, videosink, NULL);
    if (!gst_element_link_many(src, tee, caps_filter, NULL)
        || !gst_element_link_many(tee, queue_record, encoder, muxer, filesink, NULL)
        || !gst_element_link_many(tee, queue_display, videoconvert, videosink, NULL)) {
        g_error("Failed to link elements");
        return -2;
    }

    gst_element_set_state(pipeline, GST_STATE_PLAYING);
    if (gst_element_get_state (pipeline, NULL, NULL, -1) == GST_STATE_CHANGE_FAILURE) {
        g_error("Failed to go into PLAYING state");
    }

    bus = gst_pipeline_get_bus(GST_PIPELINE (pipeline));
    gst_bus_add_signal_watch(bus);
    g_signal_connect(G_OBJECT(bus), "message", G_CALLBACK(message_cb), NULL);
    //g_signal_connect(bus, "need-data", G_CALLBACK(need_data), NULL);
    gst_object_unref(GST_OBJECT(bus));

    g_signal_connect(appsrc, "need-data", G_CALLBACK(need_data), NULL);

    loop = g_main_loop_new(NULL, FALSE);
    g_print("Starting loop");
    g_main_loop_run(loop);

    // Free resources
    gst_object_unref (bus);
    gst_element_set_state (pipeline, GST_STATE_NULL);
    gst_object_unref (pipeline);

    return 0;
}

// Thanks!

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Re: Example code for muxing klv (meta/x-klv) with mpegtsmux (plugins-bad) and GStreamer 1.8.3

Arjen Veenhuizen
It has been a while since I muxed KLV using mpegtsmux, but your approach
seems to be quite about right.
I just had to make sure that I feed the muxer with KLV data *every* (video)
frame and make sure the PTS is correct.

Some python snippets:





Be sure to push an eos event on appsrc srcpad when you are done (e.g.
event-probe the muxer video sync pad for the EOS event), otherwise your
pipeline will stall.

Hope it helps.



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RE:Example code for muxing klv (meta/x-klv) with mpegtsmux (plugins-bad) and GStreamer 1.8.3

Jean-Sébastien Bilodeau
Hi,

First of all, thank you for your encouraging response and for advice. So it's possible! Is mpegtsmux stable according to your experience?

I actually want to mux KLV metadata for each frame of the video. The example code is my only experience with GStreamer, I have taken code examples here and there and I'm not familiar with their plugin concept and how I can pass my data through a callback (for each frame). Currently, the callback is only called once at the end of the video.

No metadata appear to be muxed in the video file and it's missing a piece of code for now. I modified the need_data function for this:

void need_data(GstElement* element, guint, gpointer userData){
        std::cout << "need_data" << std::endl;

        // TODO push binary data (rtp_KLV_frame_data) in Big-Endian.
        GstBuffer *buffer = gst_buffer_new();
        GstMapInfo map;

        gst_buffer_map(buffer, &map, GST_MAP_WRITE);
        map.data = (guint8*)g_memdup(rtp_KLV_frame_data, rtp_KLV_frame_data_size);
        map.size = rtp_KLV_frame_data_size;
        gst_buffer_unmap (buffer, &map);

        GST_BUFFER_TIMESTAMP(buffer) = appsrc->base_time;
        GST_BUFFER_DURATION (buffer) = gst_util_uint64_scale_int (1, GST_SECOND, 1);
        appsrc->base_time += GST_BUFFER_DURATION (buffer);
        //gst_app_src_push_buffer(GST_APP_SRC(element), buffer);
}

Then I added appsrc to the call of gst_bin_add_many: gst_bin_add_many (GST_BIN (pipeline), src, appsrc, ....

What should I check in relation to the PTS buffer? (The buffer PTS refers to the timestamp when the buffer content should be presented to the user and is not always monotonically increasing.)

Thanks!
________________________________________
De : Arjen Veenhuizen [[hidden email]]
Envoyé : mardi 26 septembre 2017 16:12
À : [hidden email]
Objet : Re: Example code for muxing klv (meta/x-klv) with mpegtsmux (plugins-bad) and GStreamer 1.8.3

It has been a while since I muxed KLV using mpegtsmux, but your approach
seems to be quite about right.
I just had to make sure that I feed the muxer with KLV data *every* (video)
frame and make sure the PTS is correct.

Some python snippets:





Be sure to push an eos event on appsrc srcpad when you are done (e.g.
event-probe the muxer video sync pad for the EOS event), otherwise your
pipeline will stall.

Hope it helps.



--
Sent from: http://gstreamer-devel.966125.n4.nabble.com/

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RE:Example code for muxing klv (meta/x-klv) with mpegtsmux (plugins-bad) and GStreamer 1.8.3

Jean-Sébastien Bilodeau
Hi,

I continue my attempts to mux KLV metadata (meta/x-klv) with a video stream and save them to a file using the mpegtsmux plugin with GStreamer 1.8.3.

I have started to read the Gstreamer application development manual and I think using callback to pass KLV data is not the right approach. I think that the mpegtsmux element need a meta/x-klv source element for its meta/x-klv sink pad. So, I plan to read the GStreamer plugin writer's guide.

If someone have advice or a short example of code to create a source klv element in order to pass the data to mpegtsmux element for each frame has even my code/application, I am taker.

Thanks!
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Re: Example code for muxing klv (meta/x-klv) with mpegtsmux (plugins-bad) and GStreamer 1.8.3

Nicolas Dufresne-5
Le mardi 03 octobre 2017 à 13:38 +0000, Jean-Sébastien Bilodeau a
écrit :

> I continue my attempts to mux KLV metadata (meta/x-klv) with a video
> stream and save them to a file using the mpegtsmux plugin with
> GStreamer 1.8.3.
>
> I have started to read the Gstreamer application development manual
> and I think using callback to pass KLV data is not the right
> approach. I think that the mpegtsmux element need a meta/x-klv source
> element for its meta/x-klv sink pad. So, I plan to read the GStreamer
> plugin writer's guide.
>
> If someone have advice or a short example of code to create a source
> klv element in order to pass the data to mpegtsmux element for each
> frame has even my code/application, I am taker.

In one of our project, we used appsrc/appsink to handle the KLV
streams.

regards,
Nicolas
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Re: Example code for muxing klv (meta/x-klv) with mpegtsmux (plugins-bad) and GStreamer 1.8.3

Nicolas Dufresne-5
In reply to this post by Jean-Sébastien Bilodeau
Le jeudi 28 septembre 2017 à 00:21 +0000, Jean-Sébastien Bilodeau a
écrit :
> Then I added appsrc to the call of gst_bin_add_many: gst_bin_add_many
> (GST_BIN (pipeline), src, appsrc, ....
>
> What should I check in relation to the PTS buffer? (The buffer PTS
> refers to the timestamp when the buffer content should be presented
> to the user and is not always monotonically increasing.)

For the "received" PTS, you need to also track the segment (if you use
the GstSample, the segment is contained, gst_sample_get_segment ()).
You can then transform the PTS into running-time, using
gst_segment_to_running_time(). This will give you some monotonic time,
that starts from 0, and correlate with the pipeline clock. The Pipeline
base_time (gst_element_get_base_time()) which is available on any
active GstElement matches the clock time at running time 0.

Nicolas
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RE:Example code for muxing klv (meta/x-klv) with mpegtsmux (plugins-bad) and GStreamer 1.8.3

Jean-Sébastien Bilodeau
In reply to this post by Nicolas Dufresne-5
Hi all,

I was actually close to the solution using appsrc to push the klv metadata into the GStreamer pipeline in order that mpegtsmux captures them and uses them.

In the chapter 19 of Gstreamer application development manual, there is an example of using appsrc to push a video (video / x-raw) with one frame on two white and one on two black. I started from this example, and now it works even if some correction will be necessary. For example, the metadata is not synchronized with the video stream.

Thanks for all the comments!
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