Re: Re: DVD Double Layer Playing problem: RESOLVED
Andy was absolutely correct, my problem was not with the burner or the burning, it was an issue with the keys. I have now successfully burned Dual Layer DVD-Rs with growisofs; there seems to be no problem. I would like to thank Andy for his time and attention regards brett -- Brett Stevens Associate Professor School of Mathematics and Statistics Carleton University 1125 Colonel By Dr. Ottawa ON K1S 5B6 Canada (613) 520-2600 x2125 FAX: (613) 520-3536 ``[Using] `Anarchism' indifferently with `anarchy' ... is a hardly more correct use of words than saying that a Conservative is one who makes jam.'' -- George Orwell -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: DVD Double Layer Playing problem
Thank you very much for taking the time to reply. Most of what you say makes the trouble I am having make sense. But three things do not seem to fit: I never said I know everything, or in other words I can as well be incorrect:-) No warranties implied. 1) I can play the .iso that I made with dd just fine in Xine. This should be just as scrambled as the DVD I burn from it. As far as I understand there're two ways to get scrambling key: a) convince player to give it up; b) brute-force it [which takes like milliseconds]. Xine is using libdvdcss and it's known fact that the latter is perfectly capable of b). If scrambled sectors are marked as such [I believe they are], then they can be identified and key can be brute-forced upon moment first scrambled sector is encountered. It's plausible that that's how .iso playback works. But once again, no warranties implied, as I don't actually consider myself an expert in CSS protection... 2) This procedure has worked to create a copy of a commercial single layer DVD just fine. It's possible that that video content on that particular DVD was not actually scrambled. It's not required by standard... You can even have region-protected media, yet unscrambled content... 3) running diff on the .iso and the (unplayable) mounted burnt DL DVD reported no differences. Keep in mind that scrambling keys reside in DVD control area. You can't copy them with dd, nor can you burn them on copy, so that original and copy *are* different. A. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: DVD Double Layer Playing problem
Andy, Thank you very much for taking the time to reply. Most of what you say makes the trouble I am having make sense. But three things do not seem to fit: 1) I can play the .iso that I made with dd just fine in Xine. This should be just as scrambled as the DVD I burn from it. 2) This procedure has worked to create a copy of a commercial single layer DVD just fine. 3) running diff on the .iso and the (unplayable) mounted burnt DL DVD reported no differences. regards brett On Tue, 2006-07-11 at 16:28 +0200, Andy Polyakov wrote: > > I recently obtained a two DVD+-RW DL burners and decided to test them by > > trying to burn a copy of Monster's Inc (which is a DVD we own that is a > > DL disk) They are the Plextor DVDR PX-750A and the DVD-RW drive that > > comes with the SONY VIAO VGN-SZ160P. > > > > I used > > > > dd if=/dev/dvd of=DVD.iso bs=2048 > > > > to make the ISO, and > > > > growisofs -dvd-compat -Z /dev/dvd=DVD.iso > > > > to burn it. > > > > There were no reported errors at all during the burning process. > > > > I can mount the burned disks on the either of the Dl DVD+-RW drives that > > did burning, but my oldest DVD drive (which is only a DVD-RW single > > layer burner) thinks there is no media there (it can play commerical DL > > DVDs just fine). > > It's probably deficiency of this recorder. Recorders [unlike pure ROM > players] are expected to have closer look at media, closer than looking > at Media Book Type that is. It probably smells recordable media, but > it's too old to believe that it's double layer... > > > I can play the ISO image with xine no problem and I > > have used "diff" to verify that > > > > 1) The ISO and the burned DVDs movie are the same > > > > But I cannot play the burned DVDs as video anywhere, including the > > drives that burned it one (with either windows or linux) On windows or > > a commercial stand-alone DVD player I get a frozen scene from one of the > > previews with a stuttering text that loops after a few minutes. With > > either xine or totem it reports that this DVD is encrypted and > > recommends that I install libdvdcss. I have libdvdccs installed and it > > is what I use to watch most commercial DVDs that I watch. > > Content protection is two-fold. First you have to authenticate yourself > to unit so that it gives up protected sectors, and then you have to > descramble the content. When you ran dd you probably were authenticated > [you probably ran xine prior dd], but dd doesn't do any descrambling and > therefore you've copied scrambled content. When you burn it to > recordable media it turns unplayable [you're likely to hear audio > though], because you didn't copy the descrambling keys, nor marked > protected sectors as scrambled. But before you ask how do you do the > latter two, keep in mind that you *can't*. Consumer recordables provide > *no* way to copy or setup own descrambling keys and therefore the only > way is to descramble content prior recording. How is another question > [which I don't feel capable to answer]. > > > It seems clear that in terms of data and filesystems, > > I'd challenge the "terms of data" part. The fact that you can mount it > is not mystery, because not everything is scrambled. Most notably > sectors describing/defining file system layout are not, which is why > it's never a problem to mount protected media and list files on it. Not > even whole video content is scrambled, most notably menus are commonly > not, so you can always "navigate"... A. > -- "Choosing a basis for a vector space is an act of violence" --unkown University of Chicago professor circa 1989 (If you know who said this please let me know) Brett Stevens School of Mathematics and Statistics Carleton University 1125 Colonel By Dr. Ottawa ON K1S 5B6 Canada 613 520 2600 x2125 [EMAIL PROTECTED] http://mathstat.carleton.ca/~brett/ -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
Re: DVD Double Layer Playing problem
I recently obtained a two DVD+-RW DL burners and decided to test them by trying to burn a copy of Monster's Inc (which is a DVD we own that is a DL disk) They are the Plextor DVDR PX-750A and the DVD-RW drive that comes with the SONY VIAO VGN-SZ160P. I used dd if=/dev/dvd of=DVD.iso bs=2048 to make the ISO, and growisofs -dvd-compat -Z /dev/dvd=DVD.iso to burn it. There were no reported errors at all during the burning process. I can mount the burned disks on the either of the Dl DVD+-RW drives that did burning, but my oldest DVD drive (which is only a DVD-RW single layer burner) thinks there is no media there (it can play commerical DL DVDs just fine). It's probably deficiency of this recorder. Recorders [unlike pure ROM players] are expected to have closer look at media, closer than looking at Media Book Type that is. It probably smells recordable media, but it's too old to believe that it's double layer... I can play the ISO image with xine no problem and I have used "diff" to verify that 1) The ISO and the burned DVDs movie are the same But I cannot play the burned DVDs as video anywhere, including the drives that burned it one (with either windows or linux) On windows or a commercial stand-alone DVD player I get a frozen scene from one of the previews with a stuttering text that loops after a few minutes. With either xine or totem it reports that this DVD is encrypted and recommends that I install libdvdcss. I have libdvdccs installed and it is what I use to watch most commercial DVDs that I watch. Content protection is two-fold. First you have to authenticate yourself to unit so that it gives up protected sectors, and then you have to descramble the content. When you ran dd you probably were authenticated [you probably ran xine prior dd], but dd doesn't do any descrambling and therefore you've copied scrambled content. When you burn it to recordable media it turns unplayable [you're likely to hear audio though], because you didn't copy the descrambling keys, nor marked protected sectors as scrambled. But before you ask how do you do the latter two, keep in mind that you *can't*. Consumer recordables provide *no* way to copy or setup own descrambling keys and therefore the only way is to descramble content prior recording. How is another question [which I don't feel capable to answer]. It seems clear that in terms of data and filesystems, I'd challenge the "terms of data" part. The fact that you can mount it is not mystery, because not everything is scrambled. Most notably sectors describing/defining file system layout are not, which is why it's never a problem to mount protected media and list files on it. Not even whole video content is scrambled, most notably menus are commonly not, so you can always "navigate"... A. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
DVD Double Layer Playing problem
I recently obtained a two DVD+-RW DL burners and decided to test them by trying to burn a copy of Monster's Inc (which is a DVD we own that is a DL disk) They are the Plextor DVDR PX-750A and the DVD-RW drive that comes with the SONY VIAO VGN-SZ160P. I used dd if=/dev/dvd of=DVD.iso bs=2048 to make the ISO, and growisofs -dvd-compat -Z /dev/dvd=DVD.iso to burn it. There were no reported errors at all during the burning process. I can mount the burned disks on the either of the Dl DVD+-RW drives that did burning, but my oldest DVD drive (which is only a DVD-RW single layer burner) thinks there is no media there (it can play commerical DL DVDs just fine). I can play the ISO image with xine no problem and I have used "diff" to verify that 1) The ISO and the burned DVDs movie are the same But I cannot play the burned DVDs as video anywhere, including the drives that burned it one (with either windows or linux) On windows or a commercial stand-alone DVD player I get a frozen scene from one of the previews with a stuttering text that loops after a few minutes. With either xine or totem it reports that this DVD is encrypted and recommends that I install libdvdcss. I have libdvdccs installed and it is what I use to watch most commercial DVDs that I watch. Additional info. dvd+rw-mediainfo reports "Media Book Type: 01h, DVD-ROM book [revision 1]" for both the burned DVD and original, so I don't think using "dvd+rw-booktype -dvd-rom -media /dev/scdN" from Andy Polyakov's DVD+RW tools webpage will work (I have not tried it though) It seems clear that in terms of data and filesystems, I am burning DVD-9s (DL DVDs) just fine, but not from a video playing point of veiw. Does anyone know what is going on and how I can fix it? regards brett stevens -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
