From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1Rbc8C-0005Q4-63 for garchives@archives.gentoo.org; Fri, 16 Dec 2011 18:03:41 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id E65FB21C12D; Fri, 16 Dec 2011 18:03:24 +0000 (UTC) Received: from mail-we0-f181.google.com (mail-we0-f181.google.com [74.125.82.181]) by pigeon.gentoo.org (Postfix) with ESMTP id 4BFAF21C298 for ; Fri, 16 Dec 2011 18:02:16 +0000 (UTC) Received: by werm12 with SMTP id m12so656027wer.40 for ; Fri, 16 Dec 2011 10:02:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=kbhtxJI1ri0Wc/KYZ0dAE6jP8PVb4SQyReQeFQYS7KM=; b=Fuu/0lxdYc9tVdwrY6eqaAk1cf3wuwc755z87aO3cqND0aVjgrP7jEUIWDZJMKXONk V6fR6YrenD0XdVVVlvVA5XUGPu4ap0wqzjd171vtdyz+FDCFsaO8jGQlts0dySYSGsxj 3OlP3Lh2t6nleX1xY8bdpo+8B8xrYxf0xr3Xw= Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Received: by 10.216.138.5 with SMTP id z5mr1026248wei.37.1324058535512; Fri, 16 Dec 2011 10:02:15 -0800 (PST) Received: by 10.223.160.73 with HTTP; Fri, 16 Dec 2011 10:02:15 -0800 (PST) In-Reply-To: References: Date: Fri, 16 Dec 2011 10:02:15 -0800 Message-ID: Subject: Re: [gentoo-user] DVD Movie backups From: Mark Knecht To: gentoo-user@lists.gentoo.org Content-Type: text/plain; charset=UTF-8 X-Archives-Salt: fc78990b-d58a-4706-995d-11c3134ed780 X-Archives-Hash: 4320e821787d4a253799048b64832675 On Fri, Dec 16, 2011 at 9:53 AM, Michael Mol wrote: > On Fri, Dec 16, 2011 at 12:25 PM, Mark Knecht wrote: >> On Fri, Dec 16, 2011 at 9:06 AM, Michael Mol wrote: >>> No; you'll have to decrypt, or do without the encrypted bits. >>> >>> dvdbackup is probably the closest to what you want. >>> >>> On Dec 16, 2011 11:09 AM, "Mark Knecht" wrote: >>>> >>>> For archive purposes is there a simple way for me to make a >>>> bit-for-bit copy retail DVDs I've purchased? >>>> >>>> Assume that I've got the right sort of DVD drive, I guess something >>>> capable of writing dual-layer DVDs. >>>> >>>> Thanks, >>>> Mark >> >> Interesting. So even something that just copies blocks of data, like >> dd, can't be used for that purpose? >> >> I have no interest in tearing apart the DVD in any way. It was more >> about the idea of a fire causing the loss of maybe $15K-$20K >> investment over the years. I can rip all the CDs, keep the ripped >> version here to watch on the computer, and store the DVDs elsewhere, >> but that elimiates (generally) being able to watch special features >> which my wife and kid enjoy. >> >> Thanks for the info. > > I did exactly the same thing a few years ago, but it's been a long, > long time, so my memory on my process is very fuzzy. (It also involved > my first foray into RAID...I've got a couple hundred DVDs!) Go ahead, > count the number of times I qualify something with "IIRC"... > > dvdbackup can recreate the ISO images, IIRC. > > If you run a simple 'dd' on a DVD with encrypted portions, you'll get > I/O errors when it encounters the encrypted pieces. IIRC, some of the > data required to decrypt those portions is on the disc, but it's in an > out-of-the-way portion that won't show up as part of the block device. > IIRC, dvdbackup makes use of libdvdcss to decrypt the encrypted > portions[1], and writes a decrypted version of the data. *this* is why > you can't make a bit-for-bit copy; the output data would be decrypted. > > There are other, later obstacles, too; once CSS was broken, some > content publishers (Bandai USA, for example) would fudge the ISO spec > and the DVD nav specs in ways that didn't break *most* hardware DVD > players, but did tend to break players which strictly adhered to the > standards, such as ffmpeg, vlc and mplayer. It also broke dvdbackup > for me, IIRC, which is why I had to resort to vobcopy in some cases. I > expect the software angle for handling these things has gotten better, > though. > > [1] I don't know how it does it when dd would have hit an I/O error. > Obviously, my understanding of the workings of dvdbackup, dd, DVDs and > CSS encryption is flawed somehow. > > -- > :wq > Thanks for the info. It makes it a bit clearer as to what's causing the road block vs. the sort of answer Jorg provided this morning which did nothing (as when I asked on the cd-record list a few days ago and the answer there did nothing either) to advance my knowledge on the subject. I appreciate the time it took you to respond. Thanks! Cheers, Mark