[Bug 726161] New: png plugin handles interlaced png files incorrectly

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=726161
  GStreamer | gst-plugins-good | 1.2.2

           Summary: png plugin handles interlaced png files incorrectly
    Classification: Platform
           Product: GStreamer
           Version: 1.2.2
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: galtgendo at o2.pl
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=271582)
 View: https://bugzilla.gnome.org/attachment.cgi?id=271582
 Review: https://bugzilla.gnome.org/review?bug=726161&attachment=271582

load interlaced png correctly

1. gst-launch-1.0 filesrc location=<a png file> ! decodebin ! imagefreze
!videoconvert ! autovideosink
2. convert that file to interlaced
3. gst-launch-1.0 filesrc location=<the converted file> ! decodebin !
imagefreze !videoconvert ! autovideosink
4. note the difference

I did some digging around and eventually came up with a fix...
The speed is nearly unacceptable, but that likely the price for progressive
load.

On a funny note: as for the FIXME about interlaced images, it was already in
0.10, but the images worked correctly there (likely due to png_read_image
autocorrecting stuff).

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