[gstreamer-bugs] [Bug 161079] New: RFE: [videoscale] implement bilinear or bicubic methods for down-scaling

[bugzilla-daemon at bugzilla.gnome.org]

http://bugzilla.gnome.org/show_bug.cgi?id=161079
GStreamer | gst-plugins | Ver: HEAD CVS

           Summary: RFE: [videoscale] implement bilinear or bicubic methods
                    for down-scaling
           Product: GStreamer
           Version: HEAD CVS
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: t.i.m at zen.co.uk
         QAContact: gstreamer-bugs at lists.sourceforge.net


Currently videoscale only supports Nearest Neighbour as scaling method. 
 
Nearest Neighbour is fast and works pretty well for scaling up, but is just 
not really usable for down-scaling video images. The resulting picture is very 
blocky with 'stair-case' effects that are very easy to notice at almost all 
(picture object) edges. 
 
It would be great if GStreamer would implement scaling methods that produce 
reasonable results for downscaling as well. 
 
gdkpixbufscale is not really an alternative, as it only accepts rgb input, and 
the colorspace conversion seems to be very expensive compared to the actual 
scaling (from a couple of quick tests I made using gst-launch and 
videotestsrc). 
 
Cheers 
 -Tim

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