Le 03/12/2014 18:14, Brian Willoughby a écrit : > On Dec 3, 2014, at 8:30 AM, Martijn van Beurden <mva...@gmail.com> wrote: >> Op 03-12-14 om 16:48 schreef Olivier Tristan: >>> This patch changes the settings associated with compression >>> levels 6, 7 and 8. With this patch, -e is no longer used, but >>> instead apodization functions are added. This should improve >>> compression with at least 95% of all material. Independent tests >>> show that this is probably the case. >> As it turns out, the material for which the compression didn't >> improve is mostly 'quiet' material. > I would like to point out that 'quiet' material is common when making > original recordings. > > I do a great deal of live recording, and the levels are always quiet in order > to guard against clipping. These live recordings are then archived via FLAC > to make sure nothing is lost. > > There are also field recording units that record directly to FLAC, and they > will also see relatively 'quiet' recordings compared to fully mastered > commercial CD music. Even though those recorders might not be updated to the > latest FLAC sources, I would hope that things are not getting worse for a > whole category of FLAC users. > > Basically, I'm worried that the FLAC sources are being fine-tuned to handle > only the subset of audio represented by commercial CDs, without regard for > 24-bit or raw tracks that have not been fully mastered. It's interesting to > note that the original FLAC algorithms performed quite well across the board, > but recent 'improvements' are sacrificing performance in one area to enhance > performance in another area. Are these the sorts of things that can be > handled by expanding the compression options, rather than thwarting existing > performance? >
It's the case actually Using -l 12 -b 4096 -m -e -r 6 will bring the previous --best behavior if understand correctly -- Olivier Tristan Research & Development www.uvi.net _______________________________________________ flac-dev mailing list flac-dev@xiph.org http://lists.xiph.org/mailman/listinfo/flac-dev
