[Matroska-users] TrackUID

[Yang]

----- Original Message ----- 
From: "Moritz Bunkus" <moritz at bunkus.org>
To: <matroska-users at lists.matroska.org>
Sent: Friday, September 02, 2005 9:56 PM
Subject: Re: [Matroska-users] TrackUID

>Hey,
>
>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.


----- Original Message ----- 
From: "Stephan Verhoeven" <grotesteph at yahoo.com>
To: <chris at matroska.org>; "Questions, help, instructions, talk about 
Matroska" <matroska-users at lists.matroska.org>
Sent: Friday, September 02, 2005 4:51 PM
Subject: Re: [Matroska-users] TrackUID


> How do you change a track in a file without changing the file's
> checksum? Isn't that impossible anyway?
>
> Christian HJ Wiesner wrote:

Yup, its imposible. But after you change track there should be 1 checksum. 
But everytime when you mux with same seting you get another checksum, 
becouse variable UID's. So making predefined UID and date you would get 
everytime same file with same checksum. But still its just a teory, becouse 
i dont know how exacly mkv is built, and how much is based on random 
numbers.

Regards
Yang