[FFmpeg-devel] fate : add test for exr B44, B44A files

Martin Vignali martin.vignali at gmail.com
Sat Mar 26 22:30:10 CET 2016

2016-03-26 21:24 GMT+01:00 Paul B Mahol <onemda at gmail.com>:

> On 3/26/16, Martin Vignali <martin.vignali at gmail.com> wrote:
> > Hello,
> >
> > In attach a patch for fate test of B44/B44A compression inside openexr
> > file.
> > samples can be download here : http://we.tl/QwJcxVn9CV
> > need to be put inside : ./fate-suite/exr/
> >
> > Detail of tests :
> >
> > rgba_scanline_float_b44.exr : test scanline B44 float file
> >  (uncompress data)
> >
> > rgba_multiscanline_half_b44.exr : b44 file with alpha. have multiple
> > scanlines
> >
> > rgba_scanline_half_b44_12x8.exr : have b44 and b44A block, all pixels
> > inside b44 block are used in the final picture
> >
> > rgba_scanline_half_b44_13x9.exr : have b44 and b44A block, some pixels in
> > B44 block are not used in the final picture
> Do you have by any chance INT32 format exr files?

In attach a sample (it's a 4 point gradient), but most software display it
in white (for thoses who interpret it in float, you need to reduce a lot
the exposure (-30. in after effects), to have something close to the
original render.)

Like UINT32 of exr is mostly for 3D data pass (like object id), i don't
know how to interpret it (in a general way) as rgba image.

> Do you gonna add other missing features, mostly tile and subsampling
> support?
> Yes (both are in progress)
- tile support (because it's the default render mode of several 3D
- subsampling (mostly for YCbCr 420 mode , because it's the "more common"
mode with subsampling (can be output by RgbaOutputFile class of the
official library (like in Adobe After Effects using Luma/Chroma mode).

The French National Cinematography Center (http://www.cnc.fr/web/en)
support us (Jokyo Images) for this work, in order to have a better use of
ffmpeg inside post-production companies (who use openexr), avoiding lot of
intermediate conversion (like what is suggest in ffmpeg wiki)

Best Regards

Jokyo Images
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