[Bug 795437] New: Not all outgoing buffers are caught while using data probes

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=795437

            Bug ID: 795437
           Summary: Not all outgoing buffers are caught while using data
                    probes
    Classification: Platform
           Product: GStreamer
           Version: 1.14.0
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: vavooon at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

When I attach data probe to srcpad of `rtph264pay` element it doesn't catch all
buffer the element sends.


I'm adding a probe with 
```
gst_pad_add_probe (pad, GST_PAD_PROBE_TYPE_BUFFER, (GstPadProbeCallback)
cb_have_data, &m_latencyInfo, NULL); 
```

and then writing down buffer info:

```
static GstPadProbeReturn
cb_have_data (GstPad          *pad,
    GstPadProbeInfo *info,
    gpointer         user_data) {
        GstStructure *stats;
        guint mtu, seqnum, timestamp;
        gint seqnumOffset;
        g_object_get (G_OBJECT (element), "stats", &stats, NULL);
        g_object_get (G_OBJECT (element), "mtu", &mtu, NULL);
        g_object_get (G_OBJECT (element), "seqnum", &seqnum, NULL);
        g_object_get (G_OBJECT (element), "seqnum-offset", &seqnumOffset,
NULL);&seqnum);
        gst_structure_get_uint(stats, "timestamp", &timestamp);
        log_debug("seqnum: % " PRIu32 " seqnum-offset: %" PRId32 " ts: %"
PRIu32 " mtu: %" PRIu32 " size: %" PRId32,
            seqnum, seqnumOffset, timestamp, mtu, gst_buffer_get_size(buffer));
}
```

With default MTU value 1400 it shows only small amount of sent buffers (or
packets):

```
seqnum: 0 seqnum-offset: 0 ts: 2467070291 mtu: 1400 size: 14
seqnum: 1 seqnum-offset: 0 ts: 2467070291 mtu: 1400 size: 23
seqnum: 2 seqnum-offset: 0 ts: 2467070291 mtu: 1400 size: 16
seqnum: 163 seqnum-offset: 0 ts: 2467070291 mtu: 1400 size: 14
seqnum: 164 seqnum-offset: 0 ts: 2467070291 mtu: 1400 size: 23
seqnum: 165 seqnum-offset: 0 ts: 2467070291 mtu: 1400 size: 16
seqnum: 326 seqnum-offset: 0 ts: 2467160291 mtu: 1400 size: 14
seqnum: 327 seqnum-offset: 0 ts: 2467160291 mtu: 1400 size: 23
seqnum: 328 seqnum-offset: 0 ts: 2467160291 mtu: 1400 size: 16
seqnum: 489 seqnum-offset: 0 ts: 2467250291 mtu: 1400 size: 14
seqnum: 490 seqnum-offset: 0 ts: 2467250291 mtu: 1400 size: 23
seqnum: 491 seqnum-offset: 0 ts: 2467250291 mtu: 1400 size: 16
seqnum: 652 seqnum-offset: 0 ts: 2467340291 mtu: 1400 size: 14
seqnum: 653 seqnum-offset: 0 ts: 2467340291 mtu: 1400 size: 23
seqnum: 654 seqnum-offset: 0 ts: 2467340291 mtu: 1400 size: 16
seqnum: 815 seqnum-offset: 0 ts: 2467430291 mtu: 1400 size: 14
```

and doesn't show main packets with encoded video, only SPS/PPS ones (probably).

However all packets are displayed when I set MTU to value bigger than max
packet size it produces:

```
seqnum: 0 seqnum-offset: 0 ts: 154585161 mtu: 957712 size: 14
seqnum: 1 seqnum-offset: 0 ts: 154585161 mtu: 957712 size: 23
seqnum: 2 seqnum-offset: 0 ts: 154585161 mtu: 957712 size: 16
seqnum: 3 seqnum-offset: 0 ts: 154585161 mtu: 957712 size: 220525
seqnum: 4 seqnum-offset: 0 ts: 154585161 mtu: 957712 size: 14
seqnum: 5 seqnum-offset: 0 ts: 154585161 mtu: 957712 size: 23
seqnum: 6 seqnum-offset: 0 ts: 154585161 mtu: 957712 size: 16
seqnum: 7 seqnum-offset: 0 ts: 154585161 mtu: 957712 size: 220784
seqnum: 8 seqnum-offset: 0 ts: 154675161 mtu: 957712 size: 14
seqnum: 9 seqnum-offset: 0 ts: 154675161 mtu: 957712 size: 23
seqnum: 10 seqnum-offset: 0 ts: 154675161 mtu: 957712 size: 16
seqnum: 11 seqnum-offset: 0 ts: 154675161 mtu: 957712 size: 220781
seqnum: 12 seqnum-offset: 0 ts: 154765161 mtu: 957712 size: 14
seqnum: 13 seqnum-offset: 0 ts: 154765161 mtu: 957712 size: 23
seqnum: 14 seqnum-offset: 0 ts: 154765161 mtu: 957712 size: 16
seqnum: 15 seqnum-offset: 0 ts: 154765161 mtu: 957712 size: 220575
seqnum: 16 seqnum-offset: 0 ts: 154855161 mtu: 957712 size: 14
```

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