[gstreamer-bugs] [Bug 588535] New: Elements need special handling of interlaced I420

[GStreamer (bugzilla.gnome.org)]

If you have any questions why you received this email, please see the text at
the end of this email. Replies to this email are NOT read, please see the text
at the end of this email. You can add comments to this bug at:
  http://bugzilla.gnome.org/show_bug.cgi?id=588535

  GStreamer | gst-plugins-base | Ver: git
           Summary: Elements need special handling of interlaced I420
           Product: GStreamer
           Version: git
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: slomo at circular-chaos.org
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: Unspecified
   GNOME milestone: Unspecified


Hi,
currently most/all elements handle interlaced I420 the same way as progressive
I420. This is wrong as it would imply that only the luma plane is interlaced
and the chroma planes are not. Also mpeg2dec outputs something different.

The layout of interlaced I420 is like the following (a1 is first line of first
field, b1 is first line of second field):

luma:         chroma r:   chroma b:

a1a1a1a1a1a1  a1a1a1      a1a1a1
b1b1b1b1b1b1  b1b1b1      b1b1b1
a2a2a2a2a2a2
b1b1b1b1b1b1


ffmpegcolorspace and videoscale just need to handle interlaced I420 as if it's
I420 with twice the width and half the height, other elements might need
something else.


-- 
See http://bugzilla.gnome.org/page.cgi?id=email.html for more info about why you received
this email, why you can't respond via email, how to stop receiving
emails (or reduce the number you receive), and how to contact someone
if you are having problems with the system.

You can add comments to this bug at http://bugzilla.gnome.org/show_bug.cgi?id=588535.