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Bug 402076 - videoscale 4-tap method broken for downscaling
videoscale 4-tap method broken for downscaling
Status: RESOLVED FIXED
Product: GStreamer
Classification: Platform
Component: gst-plugins-base
git master
Other Linux
: Normal normal
: 0.10.14
Assigned To: GStreamer Maintainers
GStreamer Maintainers
Depends on:
Blocks:
 
 
Reported: 2007-01-29 12:36 UTC by Christian Fredrik Kalager Schaller
Modified: 2007-06-15 15:24 UTC
See Also:
GNOME target: ---
GNOME version: ---


Description Christian Fredrik Kalager Schaller 2007-01-29 12:36:32 UTC 
I tried the 4-tap videoscaler method today and it did not work nicely at
all. I am using the pipeline below:

gst-launch-0.10 filesrc
location=/home/cschalle/Desktop/animusic2dvd_m720p.mov ! decodebin2
name="decode" decode. ! ffmpegcolorspace ! videoscale method=2
qos=false ! "video/x-raw-yuv, width=(int)640, height=(int)360" !
ffmpegcolorspace ! schroenc ! queue ! oggmux name=mux ! gnomevfssink
location=file:///tmp/anime.ogg decode. ! audioconvert ! vorbisenc !
queue ! mux.

The output looked horribly pixelated and whats worse is that instead of
scaling the image down it cropped it. Any 720 HD clip should work with this pipeline.
Comment 1 Michael Smith 2007-06-15 15:24:08 UTC 
Fixed with:
        * gst/videoscale/vs_4tap.c: (vs_image_scale_4tap_Y):
          Update tmpbuf for all neccesary rows, not just one, as is required
          when downscaling.
          Fixes #402076.