[mythtv-users] How long should a mythdvd perfect rip take?

[Brian Wood]

On Jun 27, 2006, at 5:37 PM, Marco Nelissen wrote:

>> On 6/28/06, Michael T. Dean <mtdean at thirdcontact.com> wrote:
>>> On 06/26/2006 04:50 PM, Steve Hodge wrote:
>>>> On 6/27/06, Marco Nelissen <marcone at xs4all.nl> wrote:
>>>>
>>>>> Some DVD drives also are much slower reading movie-DVDs than  
>>>>> they are data-DVDs.
>>>>>
>>>> I guess some drives must be slow at decoding CSS? Because  
>>>> otherwise a
>>>> movie DVD is just a data DVD with a particular directory structure.
>>>
>>> The drive doesn't decode it.  It's the CPU that decodes.  If the  
>>> drive
>>> decoded it, it would be legal to play back DVD's on Linux in the US.
>>
>> That makes sense. So why would a drive be slower at reading a movie
>> DVD than a data DVD?
>
> There is slightly more to a movie DVD than being a data DVD with a  
> particular
> directory structure. For one thing there's the encryption/ 
> authentication keys
> that are present on the disc, so the drive "knows" whether it's a  
> movie DVD
> or a data DVD. It could just be that some DVD drive firmware is  
> written such
> that it doesn't go into the highest speed for movie-DVDs (for  
> whatever reason).
> Or maybe it's got something to do with the media itself. My Samsung  
> DVD drive,
> for example, reads DVD+R at 12x, but DVD+RW is read at 8x, while  
> DVD-ROM is
> read at 16x.


And don't forget the "Region" encoding, the drive has to know what it  
is supposed to read, and what the disk is, and if there is a match  
between the two.

I don't know if the drive checks the region just once when the disk  
starts or continuously, the latter would probably slow things down a  
bit.