[Bug 663616] New: Properly report latency

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=663616
  GStreamer | gst-ffmpeg | git

           Summary: Properly report latency
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-ffmpeg
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: bilboed at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


There are a couple of places where ffmpeg introduces latency which we should
report in the LATENCY query.

* When using frame-based multi-threading (FF_THREAD_FRAME), there will be an
introduced latency of at least one frame [0]

* When context->has_b_frames is !=0, there is an introduced latency of
has_b_frames.

[0]
http://git.libav.org/?p=libav.git;a=blob;f=libavcodec/avcodec.h;h=f169bec37e487c85f13942bb7a1b691b404d8566;hb=HEAD#l2886

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