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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #1 from Vavooon <vavooon at gmail.com> ---
Just realized that the problem appears now only with data probes but also when
debugging a pipeline with GST_SCHEDULING:

```
0:00:03.673142334  9620   0xb7a1b0 DEBUG         GST_SCHEDULING
gstpad.c:4203:gst_pad_chain_data_unchecked:<capsfilter0:sink> calling
chainfunction &gst_base_transform_chain with buffer buffer: 0xbaaf38, pts
0:00:00.800000000, dts 99:99:99.999999999, dur 0:00:00.033333333, size 3110400,
offset 24, offset_end 25, flags 0x0
0:00:03.673697668  9620   0xb7a1b0 DEBUG         GST_SCHEDULING
gstpad.c:4203:gst_pad_chain_data_unchecked:<imxipuvideotransform0:sink> calling
chainfunction &gst_base_transform_chain with buffer buffer: 0xbaaf38, pts
0:00:00.800000000, dts 99:99:99.999999999, dur 0:00:00.033333333, size 3110400,
offset 24, offset_end 25, flags 0x0
0:00:03.674094001  9620   0xb7a1b0 DEBUG         GST_SCHEDULING
gstpad.c:4203:gst_pad_chain_data_unchecked:<imxvpuencoderh264-0:sink> calling
chainfunction &gst_video_encoder_chain with buffer buffer: 0xbaaf38, pts
0:00:00.800000000, dts 99:99:99.999999999, dur 0:00:00.033333333, size 3110400,
offset 24, offset_end 25, flags 0x0
0:00:03.719815001  9620   0xb7a1b0 DEBUG         GST_SCHEDULING
gstpad.c:4203:gst_pad_chain_data_unchecked:<h264parse0:sink> calling
chainfunction &gst_base_parse_chain with buffer buffer: 0xbd02b0, pts
0:00:00.800000000, dts 0:00:00.800000000, dur 0:00:00.033333333, size 220698,
offset none, offset_end none, flags 0x2000
0:00:03.723058001  9620   0xb7a1b0 DEBUG         GST_SCHEDULING
gstpad.c:4203:gst_pad_chain_data_unchecked:<rtph264pay0:sink> calling
chainfunction &0x76598f20 with buffer buffer: 0xbd0350, pts 0:00:00.800000000,
dts 0:00:00.800000000, dur 0:00:00.033333333, size 220698, offset 5295648,
offset_end none, flags 0x400
0:00:03.723454001  9620   0xb7a1b0 DEBUG         GST_SCHEDULING
gstpad.c:4203:gst_pad_chain_data_unchecked:<udpsink0:sink> calling
chainfunction &gst_base_sink_chain with buffer buffer: 0xbd02b0, pts
0:00:00.800000000, dts 0:00:00.800000000, dur 99:99:99.999999999, size 14,
offset none, offset_end none, flags 0x4000
0:00:03.724235334  9620   0xb7a1b0 DEBUG         GST_SCHEDULING
gstpad.c:4203:gst_pad_chain_data_unchecked:<udpsink0:sink> calling
chainfunction &gst_base_sink_chain with buffer buffer: 0xbd0210, pts
0:00:00.800000000, dts 0:00:00.800000000, dur 99:99:99.999999999, size 23,
offset none, offset_end none, flags 0x6000
0:00:03.724790668  9620   0xb7a1b0 DEBUG         GST_SCHEDULING
gstpad.c:4203:gst_pad_chain_data_unchecked:<udpsink0:sink> calling
chainfunction &gst_base_sink_chain with buffer buffer: 0xbc4990, pts
0:00:00.800000000, dts 0:00:00.800000000, dur 99:99:99.999999999, size 16,
offset none, offset_end none, flags 0x6000
```

You may see that there are records only about small packets sent from
rtph264pay to udpsink.

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