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.
;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
