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

On 2018-11-16 7:02 a.m., Vitaly Zdanevich wrote:
> AWS Polly produces Oggs with hardcoded serial numbers as zeros.
Your earlier ogginfo post said the file was created by ffmpeg. There was 
a bug like this in ffmpeg, fixed in 2010. I hope they're not using an 
ffmpeg build that old! Or the low-quality 'vorbis' encoder included with
the ffmpeg source instead of 'libvorbis'.

It's also possible something about their runtime environment is 
providing bad random number seeds. Either way, it's an issue which 
should be reported.

Pity they don't support Opus. It's quite a bit more efficient with
speech.

  -r

I wrote him about zeroes in serial, and about Opus too (a year ago). But maybe
they have rationality behind identical headers for speech - because with random
serials every speech file for the same text will have different hash.

16.11.2018, 20:02, "Ralph Giles" <giles at
thaumas.net>:
> On 2018-11-16 7:02 a.m., Vitaly Zdanevich wrote:
>>  AWS Polly produces Oggs with hardcoded serial numbers as zeros.
>
> Your earlier ogginfo post said the file was created by ffmpeg. There was
> a bug like this in ffmpeg, fixed in 2010. I hope they're not using an
> ffmpeg build that old! Or the low-quality 'vorbis' encoder included
with
> the ffmpeg source instead of 'libvorbis'.
>
> It's also possible something about their runtime environment is
> providing bad random number seeds. Either way, it's an issue which
> should be reported.
>
> Pity they don't support Opus. It's quite a bit more efficient with
speech.
>
>   -r

On 2018-11-16 9:25 a.m., Vitaly Zdanevich wrote:
> I wrote him about zeroes in serial, and about Opus too (a year ago). But
maybe they have rationality behind identical headers for speech - because with
random serials every speech file for the same text will have different hash.
Hmm, yes. Using a hash of the input request (and speech model version) 
for the serial number would achieve reproducible output without causing 
the most of the problems you're seeing.

  -r