RTP timestamps in AppSink

[Frederik Leth]

Hi,

Is it possible to get the RTP timestamps from the buffer in the appsink element ?

I have read, that if the RtpBin is in 'buffer-none' the PTS should contain the RTP timestamp.

PTS timestamp is 8 bytes whereas RTP timestamp is 4 bytes ?

When I run my program the timestamps from PTS is not the same I see in wireshark on the incomming packets.

Best Regards,

Frederik

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[devil coder]

can you share the code for better understanding of problem.

i used to do this to set video PTS.
                GstBuffer *gstbuf;
                GstMapInfo map = {0};
                GstFlowReturn ret;
                gtbuf->pts = thiz->timestamp;
                thiz->timestamp += 33333333; // ns



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[Tim Müller]

On Thu, 2018-02-01 at 11:09 +0100, Frederik Leth wrote:

Hi Frederik,

> Is it possible to get the RTP timestamps from the buffer in the
> appsink element ?
> I have read, that if the RtpBin is in 'buffer-none' the PTS should
> contain the RTP timestamp.
> PTS timestamp is 8 bytes whereas RTP timestamp is 4 bytes ?
> When I run my program the timestamps from PTS is not the same I see
> in wireshark on the incomming packets.

What is the data you are getting in the appsink? Is it RTP packets, or
are you talking about the depayloaded/decoded data and want to know
what the original RTP timestamp was?

If it's RTP packets you could use gst_rtp_buffer_map() +
gst_rtp_buffer_get_timestamp().

Cheers
 -Tim

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Tim Müller, Centricular Ltd - http://www.centricular.com
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[Frederik]

The data is raw data. In this case it's depayloaded and decoded audio or
video.
My setup is:
A device delivers an audio and a video stream (on seperate SSRC). The device
creates timestamps for both audio and video, so the two sources are in sync
when leaving the device.
The receiver is a gstreamer, which decodes etc. Both streams ends in it's
own appsink.
An application consumes both appsinks, and at this point I need to sync the
two streams. That is why I wan't to maintain the RTP timestamp created on
the producers (device)
Does this makes sense ??



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[Frederik]

In my reply to Tim, you can read how the setup of the pipelines are.
Here's the appSink code

static GstFlowReturn on_new_buffer(GstElement* object, gpointer user_data)
{
        GstAppSink* app_sink = (GstAppSink*)object;
        GstSample* sample = gst_app_sink_pull_sample(app_sink);
        if (sample)
        {
                GstBuffer* buffer = gst_sample_get_buffer(sample);
                GstClockTime timestamp = GST_BUFFER_PTS(buffer);
                //this timestamp is not the same as the RTP timestamp
                GstMapInfo map;
                gst_buffer_map(buffer, &map, GST_MAP_READ);
                PipeContext*  context = (PipeContext*)user_data;
                context->PublishAppSink(map.data, map.size, timestamp);

                gst_buffer_unmap(buffer, &map);
                gst_sample_unref(sample);
        }
        return GST_FLOW_OK;
}




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