[Bug 793034] New: latency tracer: Missing reports when using b-frames

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793034

            Bug ID: 793034
           Summary: latency tracer: Missing reports when using b-frames
    Classification: Platform
           Product: GStreamer
           Version: 1.12.0
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: carlos.rodriguez at ridgerun.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Using the Xilinx Ultrascale+ board and the omxh264enc/omxh265enc, when setting
b-frames in the encoder, the latency tracer is not reporting all the buffers
passing through the pipeline. It looks like the more b-frames you set, the less
buffers the tracer reports.

With below pipeline #1, you can see the latency tracer reporting 5 buffers
properly.

GST_DEBUG=*TRACE*:9 GST_TRACERS="latency" gst-launch-1.0 -v videotestsrc
is-live=true num-buffers=5 ! video/x-raw,format=NV12,width=1920,height=1080,
framerate=30/1 ! omxh265enc ip-mode=0 gop-length=30 b-frames=0 control-rate=2
filler-data=false ! fakesink silent=false -v

However, with below pipeline #2, you can see the latency tracer is reporting
only 3 buffers, and actually 5 buffers are passing and reaching the fakesink
element:

GST_DEBUG=*TRACE*:9 GST_TRACERS="latency" gst-launch-1.0 -v videotestsrc
is-live=true num-buffers=5 ! video/x-raw,format=NV12,width=1920,height=1080,
framerate=30/1 ! omxh265enc ip-mode=0 gop-length=30 b-frames=1 control-rate=2
filler-data=false ! fakesink silent=false -v

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