[FFmpeg-trac] #5693(avcodec:open): exr: support dwa decompression
FFmpeg
trac at avcodec.org
Fri Aug 9 19:47:28 EEST 2019
#5693: exr: support dwa decompression
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Reporter: ami_stuff | Owner:
Type: enhancement | Status: open
Priority: wish | Component: avcodec
Version: git-master | Resolution:
Keywords: exr | Blocked By:
Blocking: | Reproduced by developer: 1
Analyzed by developer: 0 |
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Comment (by levivant):
I was looking around, and found out that Tiny Exr is not supporting DWAA
because there might be a patent issue. Dreamworks patented this method and
included it to the OpenExr library. The patent file is pretty clear:
https://github.com/ImageMagick/exr/blob/master/openexr/PATENTS
> This grant does not include use of DreamWorks Lossy Compression outside
of the OpenEXR standard.
How can we read that? As ffmpeg is not using the openExr Library (too bad,
why? because it's C++?) we might be outside of the grant if we implement
this method here? Linking the library might be the solution, but you might
have good reasons not to?
Still, they are saying that the grant cant be used outside of the
standard, not outside of the library. Is rewriting the exr dwaa decoder in
ffmpeg still.. the "standard"?
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Ticket URL: <https://trac.ffmpeg.org/ticket/5693#comment:5>
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