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List:       gstreamer-devel
Subject:    RE:Example code for muxing klv (meta/x-klv) with mpegtsmux (plugins-bad) and GStreamer 1.8.3
From:       Jean-Sébastien_Bilodeau <jsbilodeau () cgq ! qc ! ca>
Date:       2017-09-28 0:21:33
Message-ID: AAF364370A9DF3469BD057FA72D2460F637195 () SI-MB02 ! cegep-chicoutimi ! qc ! ca
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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 [arjen@moonlightmedia.nl]
Envoyé : mardi 26 septembre 2017 16:12
À : gstreamer-devel@lists.freedesktop.org
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.



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