ogg dev - Nov 2018 - How to concatenate Ogg in the browser JS?

Yes, I found that serials of my Oggs is all zeros, thank you, I will try to
alter serial.

15.11.2018, 19:39, "Ralph Giles" <giles at
thaumas.net>:
> On 2018-11-15 4:22 a.m., Vitaly Zdanevich wrote:
>
>>  Note: Stream 1 has serial number 0, which is legal but may cause
problems with some tools.
>
> Note if *both* files have the same serial number, it's impossible to
> find the points where they were concatentated by bisection, and most
> tools will assume they've found all the sections and calculate an
> incorrect duration. They can still be played individually because there
> is not concatenation boundary to find in the individual case.
>
> If ogginfo shows the same serial (00000000) for both of your input
> streams, that's likely the problem. Muxers are supposed to use a random
> serial number to make conflicts unlikely. You can fix them by rewriting
> the serial number so there's no conflict. Basically, you change the
> serialno field in each ogg page header and then update the crc.
>
> If you want an example, I have a quick script for doing this in
> https://git.xiph.org/?p=rogg.git;a=blob;f=rogg_serial.c
>
> HTH,
>   -r

Maybe you know some existing code snippet or library for Javascript for altering
serial and crc? Just now I compiled your quick script to wasm but the size is
28K, I think about simple correct solution for that case.

15.11.2018, 21:15, "Vitaly Zdanevich" <zdanevich.vitaly at
ya.ru>:
> Yes, I found that serials of my Oggs is all zeros, thank you, I will try to
alter serial.
>
> 15.11.2018, 19:39, "Ralph Giles" <giles at thaumas.net>:
>>  On 2018-11-15 4:22 a.m., Vitaly Zdanevich wrote:
>>
>>>   Note: Stream 1 has serial number 0, which is legal but may cause
problems with some tools.
>>
>>  Note if *both* files have the same serial number, it's impossible
to
>>  find the points where they were concatentated by bisection, and most
>>  tools will assume they've found all the sections and calculate an
>>  incorrect duration. They can still be played individually because
there
>>  is not concatenation boundary to find in the individual case.
>>
>>  If ogginfo shows the same serial (00000000) for both of your input
>>  streams, that's likely the problem. Muxers are supposed to use a
random
>>  serial number to make conflicts unlikely. You can fix them by
rewriting
>>  the serial number so there's no conflict. Basically, you change
the
>>  serialno field in each ogg page header and then update the crc.
>>
>>  If you want an example, I have a quick script for doing this in
>>  https://git.xiph.org/?p=rogg.git;a=blob;f=rogg_serial.c
>>
>>  HTH,
>>    -r

On 2018-11-15 11:01 a.m., Vitaly Zdanevich wrote:
> Maybe you know some existing code snippet or library for Javascript for
altering serial and crc?
I don't, sorry.
> Just now I compiled your quick script to wasm but the size is 28K, > I
think about simple correct solution for that case.
If you strip out the fprintf()s for progress and error reporting, it 
might get smaller. More so if you replace the open/memmap step with 
direct access to the blob as an array. But it's not very much code to 
just port the functions to pure js.

  -r