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@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.
;Apologies Trent ! further investigation shows only 6Gb on the DVD; whilst not exactly as above what is being reported is uncompressed size; mystery solved ! apologies Rohan McLeod