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Author Topic: Opening zip files created on a Mac of 4GB or bigger on a Windows or Linux PC Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 02-05-2017 05:01 PM                     DMG is an Apple proprietary format. ISO, unlike ZIP, carries no built-in integrity information and would need to be verified against a separate hash file in a separate process with separate tools (typically commandline driven). ZIP is perfectly up to the task. It is just a bad idea to create large ZIP files with Apples OS X context menu archive function, instead of using one of the many available free tools that creates universal compatible ZIP64 files. Besides that, real world DCPs do actually benefit from compression to a certain extent. It is quite common for the audio MXF files to contain silent PCM tracks, and those do compress very well with standard methods. Even static J2K sequences do occur regularly, e.g. in leaders and titles, and if the block size is optimized, will compress nicely. Even a few percent overall will payout with respect to storage space and transmission effort. That's probably why the major trailer distribution portals use it. One Dolby trailer I just looked up on my notebook is 2.85Gbytes uncompressed, and 1.44GBytes compressed. I'm a Mac user myself, but the issue is very simple - Apple screwed the system archive function, leaving large ZIP files incompatible with the ZIP64 format. Would be no problem if they wouldn't give these files the ZIP extension, and treat them as Mac proprietary. Hell, they even managed to pack different versions of ZIP and UNZIP into some of their OS X releases so that you couldn't unarchive >4GB files created on the same machine. Besides that issue, I have nether ever encountered any issue with ZIP compressed trailers ever. And we do have around 600 or so on our file storage, they all came ZIP compressed. - Carsten  |  IP: Logged Leo Enticknap Film God Posts: 7474 From: Loma Linda, CA Registered: Jul 2000 posted 03-28-2017 10:22 AM                        The solution I eventually went for was to buy a used Mac Pro tower of 2009 vintage for $70 on Ebay. Listed as won't boot - for spares or repair. Turned out that a "click of death" hard drive was the only thing wrong with it. Another $15 got me a Mac OS 10.7 flash stick (the latest version that this model can run, according to various places online), and it now works fine: it unzipped the last trailer zip I had trouble with (A Man Called Ove) without complaining. I do occasional bits of work on the side doing digital transfers of old audio recordings (mainly 78rpm phonograph discs and 1/4" tapes) and home movie camcorder tapes (S/VHS, Hi8, Mini DV, etc.), and so another advantage of this is that if a customer asks for the transfers on a drive that (s)he can read on a Mac, I can now connect it to an actual Mac and be 100% certain of that. Previously, I'd created HFS+ volumes in Ubuntu with hfsprogs, and had never received any "I can't read this" complaints: but it's nice to have that extra assurance.  |  IP: Logged Mattias Mattsson Film Handler Posts: 90 From: Göteborg, Sweden Registered: May 2007 posted 03-28-2017 05:21 PM                     It seems that maybe support for these files are being added to 7-zip: https://sourceforge.net/p/sevenzip/bugs/2038/#9f4f There are also links to some blog posts there for those who want to read up on the details of this issue.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 03-29-2017 05:18 AM                     I find it interesting that the 7-ZIP guy never heard about this issue before. That OS X ZIP anomaly exists for years. Recently I gave a workshop on DCP-o-matic and that issue came up as well. Good to know they may be working on a solution in 7-ZIP. Better if Apple would finally acknowledge their flawed implementation. - Carsten  |  IP: Logged Jeremie Dunand Film Handler Posts: 4 From: Villeurbanne, Rhone, France Registered: Mar 2017 posted 04-07-2017 09:36 AM                        Hello, I have also seen this problem many times. The solution I found was using an old MacBook that I was no longer using (a 2006 model). It is plugged into my LAN and when I encounter a problem with a compressed file I transfer it to it, I uncompress it from the mac and I retrieve it via LAN on Windows or Linux. It's not the fastest, but it works! I will follow the work of 7zip regarding this problem. Jérémie  |  IP: Logged Leo Enticknap Film God Posts: 7474 From: Loma Linda, CA Registered: Jul 2000 posted 04-10-2017 11:38 AM                        Looks like we're all agreeing on the same solution: Hackintoshing and VMs involve too much time and effort, especially if you don't need or want a Mac for anything else, and given the street price of used, older ones.  |  IP: Logged George Germisashvili Film Handler Posts: 16 From: Republic of Georgia Registered: Oct 2011 posted 04-10-2017 03:00 PM                     Hi! Try win-rar http://www.rarlab.com/download.htm Will test it tomorrow, make zip on Mac 5gb size and use winrar on win 7. (now trying to do this on Mac with VMvare virtual machine with installed win7 on it)  |  IP: Logged Ioannis Syrogiannis Expert Film Handler Posts: 147 From: Reykjavík, Iceland Registered: Jun 2005 posted 04-17-2017 12:53 PM                     Just my two cents here: If someone doesn't have a DVD (or USB, nowadays) for installing a Mac OS X version handy and time is pressing (no ebay solutions), I would suggest that a vagrant box* could provide a (fairly) working-out-of-the-box virtual machine. A living and kicking mac would be failure-proof. No doubt. But there aren't always many choices to pick from. *vagrant is a cross-platform tool, made for managing virtual machine configurations and environments in a more controlled and global way that can import/export such environments in a "vagrant box", which are easier to be shared. A number of such vagrant boxes are freely available in community supported repositories and easy to be found, if looked for. (P.S. I won't start with the reasons a non-Windows PC wouldn't solely fit in a projection booth.)  |  IP: Logged Mattias Mattsson Film Handler Posts: 90 From: Göteborg, Sweden Registered: May 2007 posted 05-03-2017 02:18 PM                     7-Zip version 17.00 beta was released just a few days ago. I have done a few tests and can confirm that it can successfully extract large zip files (>4GiB) created by macOS Finder. Download it here: http://www.7-zip.org/download.html  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 05-03-2017 04:09 PM                     Wow! Great times... Thanx for sharing! - Carsten  |  IP: Logged Mattias Mattsson Film Handler Posts: 90 From: Göteborg, Sweden Registered: May 2007 posted 08-29-2017 06:15 AM                     7-Zip v17.01 beta was released yesterday: https://sourceforge.net/p/sevenzip/discussion/45797/thread/de8085ea/  |  IP: Logged

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