[FFmpeg-trac] #3794(swscale:new): SWSCALE: Quantization Errors in Y Studio Range

FFmpeg trac at avcodec.org
Wed Jul 23 10:36:00 CEST 2014

#3794: SWSCALE: Quantization Errors in Y Studio Range
             Reporter:  troy_s      |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  swscale
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |

Comment (by troy_s):

 The “diff” is an image based diff which shows precisely what pixels are
 off from their theoretical.

 The RGB format is a relative tri-color space, and given correct handling,
 is nothing more than a wrapper to make the data easier to compare. Here
 the Y, Cb, and Cr planes were extracted from the raw YCbCr planar file and
 recombined into an RGB wrapper.

 The red channel corresponds to Y, with green and blue Cb and Cr

 These Y quantization errors seem minor, but the full range output exhibits
 many more errors that I will report tomorrow. I posted this because the
 issues may be related.

Ticket URL: <https://trac.ffmpeg.org/ticket/3794#comment:4>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker

More information about the FFmpeg-trac mailing list