From: Niklas Haas <ffmpeg@haasn.xyz> To: ffmpeg-devel@ffmpeg.org Subject: Re: [FFmpeg-devel] [FFmpeg-cvslog] swscale: use 16-bit intermediate precision for RGB/XYZ conversion Date: Fri, 14 Mar 2025 01:09:30 +0100 Message-ID: <20250314010930.GB892569@haasn.xyz> (raw) In-Reply-To: <20250313235425.GC4991@pb2> On Fri, 14 Mar 2025 00:54:25 +0100 Michael Niedermayer <michael@niedermayer.cc> wrote: > Hi > > On Sun, Jan 26, 2025 at 07:26:59PM +0100, Michael Niedermayer wrote: > > On Thu, Dec 26, 2024 at 07:33:23PM +0000, Niklas Haas wrote: > > > ffmpeg | branch: master | Niklas Haas <git@haasn.dev> | Mon Dec 16 14:49:39 2024 +0100| [af6d52eec66961f6a502b0f2f390c12226d087cd] | committer: Niklas Haas > > > > > > swscale: use 16-bit intermediate precision for RGB/XYZ conversion > > > > > > The current logic uses 12-bit linear light math, which is woefully insufficient > > > and leads to nasty postarization artifacts. This patch simply switches the > > > internal logic to 16-bit precision. > > > > > > This raises the memory requirement of these tables from 32 kB to 272 kB. > > > > > > All relevant FATE tests updated for improved accuracy. > > > > > > Fixes: #4829 > > > Signed-off-by: Niklas Haas <git@haasn.dev> > > > Sponsored-by: Sovereign Tech Fund > > > > > > > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=af6d52eec66961f6a502b0f2f390c12226d087cd > > > --- > > > > this breaks on x86-32 > > ping > > the fate tests for a major architecture are broken since this > This impacts future bisections over that range for example My bad, missed this email for some reason. Will investigate and fix tomorrow. > > you can trivially test this on x86-64 with something like: > --cross-prefix=/usr/i686-linux-gnu/bin/ --cc='ccache i686-linux-gnu-gcc-7' --arch=x86_32 --target-os=linux --enable-cross-compile > if you have the correponding packages installed > > before af6d52eec66961f6a502b0f2f390c12226d087cd > TEST filter-pixdesc-xyz12be > > after af6d52eec66961f6a502b0f2f390c12226d087cd: > --- src/tests/ref/fate/filter-pixdesc-xyz12be 2025-03-14 00:46:40.445681223 +0100 > +++ tests/data/fate/filter-pixdesc-xyz12be 2025-03-14 00:47:08.301903796 +0100 > @@ -1 +1 @@ > -pixdesc-xyz12be 1508a33dea936c45d9ee13f7743af00d > +pixdesc-xyz12be 198f43f452bc55f4ca1e0e0171de5c4c > Test filter-pixdesc-xyz12be failed. Look at tests/data/fate/filter-pixdesc-xyz12be.err for details. > make: *** [src/tests/Makefile:311: fate-filter-pixdesc-xyz12be] Error 1 > > in master: > --- src/tests/ref/fate/filter-pixdesc-xyz12be 2025-03-14 00:46:40.445681223 +0100 > +++ tests/data/fate/filter-pixdesc-xyz12be 2025-03-14 00:48:43.042660972 +0100 > @@ -1 +1 @@ > -pixdesc-xyz12be 1508a33dea936c45d9ee13f7743af00d > +pixdesc-xyz12be 198f43f452bc55f4ca1e0e0171de5c4c > Test filter-pixdesc-xyz12be failed. Look at tests/data/fate/filter-pixdesc-xyz12be.err for details. > make: *** [src/tests/Makefile:315: fate-filter-pixdesc-xyz12be] Error 1 > > > thx > > [...] > > -- > Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB > > Never trust a computer, one day, it may think you are the virus. -- Compn _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
next prev parent reply other threads:[~2025-03-14 0:09 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <20241226193325.288834126EE@natalya.videolan.org> 2025-01-26 18:26 ` Michael Niedermayer 2025-03-13 23:54 ` Michael Niedermayer 2025-03-13 23:58 ` Michael Niedermayer 2025-03-14 0:09 ` Niklas Haas [this message] 2025-03-14 20:44 ` Niklas Haas
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