[Bug 769413] alsasrc, v4l2src: getting repeated timestamps when capturing from multiple sources (multiple pipelines in single command)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=769413

--- Comment #7 from Przemek <przemyslaw.gajos at gmail.com> ---
Hi Nicolas,

Thank you - I tested your pipeline and I do not see duplicated timestamps when
using GST_DEBUG section.

There is one more thing here: 
Why sometimes time stamps start not from 0? What can it mean? Below we can see
that first time stamp for digital:sink is 0 and for ANALOG:sink it is
0:00:00.278639455

$ GST_DEBUG="*SCHED*:6" gst-launch-1.0 alsasrc device=hw:2,0 ! fakesink
name=digitial alsasrc device=hw:1,0 ! fakesink name=ANALOG 2>&1 | grep calling
| head -n 30
0:00:00.083294748 17852      0x1582e30 DEBUG         GST_SCHEDULING
gstpad.c:4175:gst_pad_chain_data_unchecked:<digitial:sink> calling
chainfunction &gst_base_sink_chain with buffer buffer: 0x7f4b380150a0, pts
0:00:00.000000000, dts 99:99:99.999999999, dur 0:00:00.092879818, size 16384,
offset 0, offset_end 4096, flags 0x40
0:00:00.159345291 17852      0x1582de0 DEBUG         GST_SCHEDULING
gstpad.c:4175:gst_pad_chain_data_unchecked:<ANALOG:sink> calling chainfunction
&gst_base_sink_chain with buffer buffer: 0x7f4b38015700, pts 0:00:00.278639455,
dts 99:99:99.999999999, dur 0:00:00.092879818, size 16384, offset 0, offset_end
4096, flags 0x40
0:00:00.239419724 17852      0x1582e30 DEBUG         GST_SCHEDULING
gstpad.c:4175:gst_pad_chain_data_unchecked:<digitial:sink> calling
chainfunction &gst_base_sink_chain with buffer buffer: 0x7f4b380151b0, pts
0:00:00.278639455, dts 99:99:99.999999999, dur 0:00:00.092879819, size 16384,
offset 12288, offset_end 16384, flags 0x40
0:00:00.335248478 17852      0x1582e30 DEBUG         GST_SCHEDULING
gstpad.c:4175:gst_pad_chain_data_unchecked:<digitial:sink> calling
chainfunction &gst_base_sink_chain with buffer buffer: 0x7f4b380152c0, pts
0:00:00.371519274, dts 99:99:99.999999999, dur 0:00:00.092879818, size 16384,
offset 16384, offset_end 20480, flags 0x0
0:00:00.347317549 17852      0x1582de0 DEBUG         GST_SCHEDULING
gstpad.c:4175:gst_pad_chain_data_unchecked:<ANALOG:sink> calling chainfunction
&gst_base_sink_chain with buffer buffer: 0x7f4b38015810, pts 0:00:00.371519274,
dts 99:99:99.999999999, dur 0:00:00.092879818, size 16384, offset 16384,
offset_end 20480, flags 0x0

Best regards,
Przemek

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