[Matroska-users] TrackUID

[Yang]

Gues i wasnt so clear about it. No, i dont want to make identical files with 
diferent content. I wish to create identical files with identical content. 
So ewerytime when you mux same file with same setings you get a file that is 
exactly the same. And i think that if we could predefine numbers that are at 
random, than it would be posible.

Besides making UID's predefined make easer selecting targets for tags. So it 
would be also a good thing for mkv muxing (no need to create multiple xml 
files, there would be 1, global with all settings).

Yang
----- Original Message ----- 
From: "Steve Lhomme" <steve.lhomme at free.fr>
To: "Questions, help, instructions, talk about Matroska" 
<matroska-users at lists.matroska.org>
Sent: Sunday, September 04, 2005 12:05 PM
Subject: Re: [Matroska-users] TrackUID


>>> On Friday 02 September 2005 18:36, Yang wrote:
>>>
>>>> I asume so, becouse after 2 muxings with same setings, the only
>>>> diference, what i can find in MatroskaPropv2.8 in advanced view, is a
>>>> diferent UID.
>>>
>>>
>>> Muxing date, muxing application, writing application, segment UID, track
>>> UIDs, attachment UIDs, chapter UIDs, tag UIDs. All those would have to
>>> be forced. The exactly same version of mkvmerge would have to be used.
>>>
>>> Sorry, too much work. I won't do it anytime soon.
>>>
>>> Mosu
>>
>>
>> Chapter UID is already predefined, same as edition UID. Same version of 
>> mkvmerge is quite obvious. So there is only needed track, tag and 
>> attachment UID's to be forced. And only problem then would be a date of 
>> muxing. But hell with it, it could be also predefined ^_^ (but as default 
>> it woul be readed from system clock). I dont know how exacly matroska is 
>> built, but if you already done half of the job, then i think it woudnt be 
>> so hard to do. mkvmerge already creates those UID by random, so i asume 
>> that there is only need for comand, that changes that random number to 
>> predefined one.
>
> No, the numbers are random precisely to identify different files globally 
> (like on P2P networks). What you are asking for, if I understand 
> correctly, is not possible. If a file has different content (whatever it 
> is) the Segment UID has to be different. And the checksum of the file will 
> *never* be the same if the content is different.
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