> I suspect that for most algorithms and their implementations, this would > > not result in repeatable "recompressed" results. Thus the checked-out > > files might be different every time you checked them out. :( How or why? Sincere question. ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ Em quinta-feira, 16 de dezembro de 2021 às 18:33, Martin Fick <mfick@xxxxxxxxxxxxxx> escreveu: > On 2021-12-16 14:20, João Victor Bonfim wrote: > > > > To expand on this, if what you're storing is already compressed, like > > > > > > Ogg Vorbis files or PNGs, like are found in that repository, then > > > > > > generally they will not delta well. This is also true of things like > > > > > > Microsoft Office or OpenOffice documents, because they're essentially > > > > > > Zip files. > > > > > > The delta algorithm looks for similarities between files to compress > > > > > > them. If a file is already compressed using something like Deflate, > > > > > > used in PNGs and Zip files, then even very similar files will > > > > > > generally > > > > > > look very different, so deltification will generally be ineffective. > > ... > > > Maybe I am thinking too outside the box, but wouldn't it be quite more > > > > effective for git to identify compressed files, specially on edge cases > > > > where the compression doesn't have a good chemistry with delta > > > > compression, > > > > decompress them for repo storage while also storing the compression > > > > algorithm as some metadata tag (like a text string or an ID code > > > > decided > > > > beforehand), and, when creating the work mirrors, return the > > > > compression > > > > to its default state before checkout? > > I suspect that for most algorithms and their implementations, this would > > not result in repeatable "recompressed" results. Thus the checked-out > > files might be different every time you checked them out. :( > > -Martin > > ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- > > The Qualcomm Innovation Center, Inc. is a member of Code > > Aurora Forum, hosted by The Linux Foundation
