[ogg-dev] How to concatenate Ogg in the browser JS?

Vitaly Zdanevich zdanevich.vitaly at ya.ru
Fri Nov 16 15:02:51 UTC 2018

AWS Polly produces Oggs with hardcoded serial numbers as zeros.

16.11.2018, 17:57, "Timothy B. Terriberry" <tterribe at xiph.org>:
> Please see the documentation: https://xiph.org/ogg/doc/framing.html
> I would encourage you to use random serial numbers, as intended, also,
> as any downstream consumers of your files will face limitations similar
> to the ones you are facing if they want to do anything more with them.
> But before you go too far down the route of changing the serial numbers,
> can you tell us what software is producing Oggs with a hard-coded serial
> number to begin with?
> Vitaly Zdanevich wrote:
>>  Thank you again for your help, now I am thinking about much simpler solution - because all my Oggs comes from the the one source looks like I can alter serial and crc32 at their hardcoded positions. Please see this screenshot https://giphy.com/gifs/9AIe7ksYBwiYQoLVv9/fullscreen with serials 11111111 and 22222222- it will be correct approach? And can you please say me from what region I need to calculate crc32? And also as we can see on the screenshot above - changed two groups of numbers beside the serials - what is that? Thank you very much for help.
>>  16.11.2018, 04:01, "Ralph Giles" <giles at thaumas.net>:
>>>  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
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