- luv-talk - luv.asn.au

Re: [luv-talk] 61GB DVD ?
by Joel W. Shea 25 Aug '18

25 Aug '18

On Fri, Aug 24, 2018 at 12:08:06PM +1000, Trent W. Buck via luv-talk wrote: > > 1. that specific DVD disc has <4.7GiB of actual raw bytes on it, i.e. if you did > > cp /dev/sr0 my-dvd.udf # or > dd if=/dev/sr0 of=my-dvd.udf > > the resulting file would be normal DVD-size. I assume so, I haven't used optical media for almost 10 years :-) > 2. inside the ordinary UDF filesystem might be (say) three different > versions of the movie, which are 95% identical, but just have 5% > different scenes --- e.g. the original theatrical version, the > director's cut (5% extra content) and the pre-watershed TV > broadcast version (5% less content - no sexy bits). > (...) > So when Rohan ripped the DVD into some conventional format, he ended up with (say) > (...) > which "adds up" to more than the DVD can logically hold. That's how I understand it. > 3. this is similar to hard links (or btrfs/ZFS shared reflinks), and > removing them due to incautious copying. Example: > (...) Probably an apt analogy, since the VOB files in the directory structure are able to reference the same VOBs (or subsets thereof) on disc, albeit it gets more complicated than that, i.e. the DVD-Video format includes it's own machine-language and VM. ~J

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61GB DVD ?
by Rohan McLeod 24 Aug '18

24 Aug '18

Assembled Cogniscenti small mystery: I was looking at this DVD "The Lovely Bones" with a view to ; assembling the .vob files into one file to play on my machine. The 'DVD drive is actually a Blu-Ray R/W drive ; which can read and write 100GB M-disks. But I was still astonished when this "DVD", seemed to have 61 GB of files ! At first I thought it was just corrupt and reporting false file sizes; but when I started copying files they all seemed to be correct. Instead of say 4 - 6 .vob files totalling about 4-6 GB ; there were 6 groups of 6 vob files; anyone come across this kind of thing and why does it exist ? regards Rohan McLeod

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Re: [luv-talk] 61GB DVD ?
by Rohan McLeod 24 Aug '18

24 Aug '18

Trent W. Buck via luv-talk wrote: > Joel Shea via luv-talk wrote: >> On 22 August 2018 at 23:16, Rohan McLeod via luv-talk <luv-talk(a)luv.asn.au> wrote: >>> I was still astonished when this "DVD", >>> seemed to have 61 GB of files ! >>> ... >>> anyone come across this kind of thing and why does it exist ? >> This has to do with the way DVD-Video is "authored", the format's >> specification is quite complicated[1], so without going too deep; the >> DVD "filesystem" is just one view of the content—since video, audio, >> subtitle and navigation streams are _multiplexed_ and stored in the VOB >> container, you can have multiple titles with their own set of VOB files >> that reference the same MPEG input streams in different ways, this could >> be due to multi-angle feature (e.g. for internationalisation, directors >> cuts, etc) and/or other extra features. >> >> It appears you may have a benign "multiple title" DVD-Video, rather than >> a brain dead copy protection attempt (e.g. obfuscation using 99 titles). >> >> How were you copying these files? > Let me paraphase to check my understanding. > > 1. that specific DVD disc has <4.7GiB of actual raw bytes on it, i.e. if you did > > cp /dev/sr0 my-dvd.udf # or > dd if=/dev/sr0 of=my-dvd.udf > > the resulting file would be normal DVD-size. > > > 2. inside the ordinary UDF filesystem might be (say) three different > versions of the movie, which are 95% identical, but just have 5% > different scenes --- e.g. the original theatrical version, the > director's cut (5% extra content) and the pre-watershed TV > broadcast version (5% less content - no sexy bits). > > So when Rohan ripped the DVD into some conventional format, he ended up with (say) > > 4.0GB movie-theatrical.mp2 > 4.2GB movie-director.mp2 > 3.8GB movie-tv.mp2 > > which "adds up" to more than the DVD can logically hold. Trent that is simply not the case; what I am seeking some explanation for is a " DVD ?" which has 61GB of files visible !; eg the output from (apologies win7 ) dir v: /s is: see at https://cloudup.com/ca4IRtI_eUC ie " 174 File(s) 66,483,209,224 bytes" which is pretty much identical to the copy on the hard disk regards Rohan McLeod

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How many Lumens can blind you?
by David Turk 25 Jul '18

25 Jul '18

https://en.wikipedia.org/wiki/Lumen_(unit)

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Humble Book Bundle: Linux Geek by No Starch Press
by Rodney Brown 17 Jul '18

17 Jul '18

https://www.humblebundle.com/books/linux-geek-books 13 Days Left >= USD1 Automate the Boring Stuff with Python: Practical Programming for Total Beginners The Artist's Guide to GIMP: Creative Techniques for Photographers, Artists, and Designers. 2nd ed. The Art of Debugging with GDB, DDD, and Eclipse Perl One-Liners: 130 Programs That Get Things Done The Book of GNS3: Build Virtual Network Labs Using Cisco, Juniper, and More No Starch Sampler >= USD8 The Book of Inkscape: The Definitive Guide to the Free Graphics Editor The Book of GIMP: A Complete Guide to Nearly Everything The Book of PF: A No-Nonsense Guide to the OpenBSD Firewall. 3rd ed. The GNU Make Book Blender Master Class: A Hands-On Guide to Modeling, Sculpting, Materials, and Rendering Doing Math with Python: Use Programming to Explore Algebra, Statistics, Calculus, and More! >= USD15 How Linux Works: What Every Superuser Should Know. 2nd ed. Wicked Cool Shell Scripts: 101 Scripts for Linux, OS X, and UNIX Systems. 2nd ed. Absolute OpenBSD: Unix for the Practical Paranoid. 2nd ed. Arduino Project Handbook Vol. 1: 25 Practical Projects to Get You Started Think Like a Programmer: An Introduction to Creative Problem Solving >= USD30 The Linux Programming Interface: A Linux and UNIX System Programming Handbook Support Charity: Electronic Frontier Foundation

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Uniti wireless
by Russell Coker 10 Jul '18

10 Jul '18

https://unitiwireless.com/ I just got a connection with Uniti wireless. It's only been running for a few hours but it seems good and it's delivering the advertised speed for upload (576KB/s is 4.6Mb/s and a good approximation to the advertised 5Mb). For download I've got 1.2MB/s from the US which is 9.8MB/s, that's quite a bit less than the advertised 25MB/s but still a reasonable speed and a lot faster than my ADSL, I haven't yet tested what speed I can get with multiple downloads at the same time. For comparison I can only get 800KB/s when downloading from Internode servers via ADSL. My ADSL connection is giving an average ping time of 46ms to my server in Melbourne and a best ping time of 33ms. Uniti is giving an average of 14ms and best of 9ms. I don't know how much of that is due to low Uniti ping times and how much is due to connectivity issues where my server is located. It could be that the company hosting my server is connected to Uniti or a company that peers with them. As Uniti runs everything it's all their issue so if something breaks and you don't have the thing of your ISP calling Telstra and Telstra taking their time to fix it. Having recently gone through this I wanted to get away from it in future. https://unitiwireless.com/plans/business-plans/ The above link is for their business plans that are about $30 per month more expensive than the home plans. The business plans all come with a static IP address. I'll probably recommend them to my clients. I chose a home plan for my home, but I know some of you like having a static IP at home and might want to pay an extra $30 per month for it (which is still cheaper than Internode ADSL). -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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Maximum optical-fibre data transfer rates was Re: NBN Cabling responsibilities and CSG
by Rohan McLeod 09 Jul '18

09 Jul '18

Andrew McGlashan via luv-main wrote: > > My biggest rant is as follows: > "Originally the plan was for a government INVESTMENT of $26.9 billion; > with monies coming back as a return on investment upon eventual sale of > the network. Now we have the real white elephant version at a cost of > $60+ billion and there won't be many suiters willing to buy it unless > they can pick it up for a song. Hence, we'll lose a very significant > amount (if not every cent), that is spent on this far inferior version > that is Turncoat's mess." It seems to me part of the problem has been that optical-fibre has always been compared with; alternatives like ADSL over copper, cell-phone wireless on the basis of current data transfer rates, which are good, but not 'disruptive' ie around 100Mb/s. The message which NBN failed to convey, was that fibre has vastly more potential. They should have been marketing that potential, so that politicians like Malcom Turnbull, who regardless of his financial prowess is a technology, dumb-cluck; got the message. For example it took me little time to find : "Earlier this year, global telecoms company Alcatel-Lucent claims to have set a new fibre optic world record with an impressive 31 Tbit/s data transfer over a single fibre cable, overtaking the previous record of 26 Tbit/s set by The Karlsruhe Institute of Technology (KIT) in May 2011, by a team of German, UK and Swiss scientists." at :https://www.warwicknet.com/blog/how-fast-can-fibre-optic-go Now this seems to be a more modern fibre-optic cable from that the NBN is laying, but we should have heard about potential data-tranfere rates (DTR) for the cable the NBN is laying, if they had any imagination. Just off the top of my head I would expect cell-phone DTR to be tied to the frequency of the carrier wave but the frequency of that wave sets the cell size. So to double the cell-phone DTR you need a technology that doubles the frequency and in consequence halves the cell size and quadruples the number of towers. Where as for NBN fibre (up to some limit), the DTR can be increased by orders of magnitude; without costs other than the sending and recieving technology. regards Rohan McLeod

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Regards last nights meeting, my presentation
by David Turk 04 Jul '18

04 Jul '18

For all that saw my phone pin, I have sent a global MIB style mind wipe, so by now you're wondering why the heck I'm telling you this. Rest assured you still should remember friends and family, however if you don't I defer to... Did you read the terms and conditions of my presentation? No, well Southpark has this message for you! https://youtu.be/FZ23kosLFec

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ZTE, Huawei, Samsung, privacy and national security
by Rohan McLeod 21 Jun '18

21 Jun '18

Assembled cognoscenti; in the context of the current national security concerns, regarding ZTE and Huawei. 1/ Does anyone know whether these relate to software eg OS or hardware ? 2/ To what extent do these also affect privacy and personal security ? Given the hardware issues (previous thread) discovered in Samsung Galaxy hardware, by Lineage developers; not to mention the proprietary issues with Android "spyware for Google"; might it not be useful to encourage ZTE and Huawei to start a campaign, advertising privacy and security issues in the hardware and software of mobile phones, from non-chinese companies ? regards Rohan McLeod

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IPv6
by Russell Coker 13 Jun '18

13 Jun '18

egrep -i "^[a-folstq]{4}$" /usr/share/dict/british-english-large You really should be using IPv6 if possible. The above command can help you find good IPv6 addresses. egrep -i "^[a-folstq]{4}$" /usr/share/dict/british-english-large|tr [A-Z] [a- z]|tr [olstq] [01579] The above command does the same but converts letters above F to 1ee7 speak equivalents. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/

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