[Bug 729268] New: libav: avoid using wrong number of samples

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=729268
  GStreamer | gst-libav | git

           Summary: libav: avoid using wrong number of samples
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-libav
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: vincent.penquerch at collabora.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=275492)
 View: https://bugzilla.gnome.org/attachment.cgi?id=275492
 Review: https://bugzilla.gnome.org/review?bug=729268&attachment=275492

avoid using wrong number of samples

If audio_in is NULL, we'll send a NULL frame to libav, to flush
the codec. In that case, we won't know how many samples the codec
will have used, so we use -1 (for don't know) when letting the
base class know about the buffer.

I'm not 100% sure this is correct, as the base class will then try to calculate
a number of samples if passed a negative value. However, a comment says it is
a best guess only. So up for comments just in case.

See also https://bugzilla.gnome.org/show_bug.cgi?id=724536

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