Re: Changing sample rate, Web Audio API, getUserMedia -- forward from [chromium-discuss]

My actual application is an education one. It captures voices from user and
have the server evaluate the pronunciation. My current implementation (via
wami-recorder) uses 16khz mono 16bit wave, which is 250kbps data. Applying
deflate will cut down about 30%, and given sending via base64 expands about
30%, my upload rate is somewhere near 250kbps. The option to do it via
javascript is here: https://github.com/imaya/zlib.js .

It is a lot, but it's acceptable. If I could cut it down to less than
64kbps, that would be fantastic. Opus looks great. But client side encoding
is going to be a problem. I do need cross browser and cross platform
solutions. It looks like deflated wave is all I got.

On Sat, Jan 12, 2013 at 5:51 AM, Robert O'Callahan <robert@ocallahan.org>wrote:

> On Sat, Jan 12, 2013 at 12:51 AM, He Shiming <heshiming@gmail.com> wrote:
>
>> Thanks Rob. It looks very well suited for my application. What's the
>> status of this document? Do you have any idea when this proposal will go
>> into recommendation?
>
>
> I can tell you that Mozilla needs the functionality and have started
> implementing it. Obviously you'd have to ask other vendors about their
> plans. Normally you can expect the spec to stabilize once people have
> implemented it :-). Also, in this case there has been input from multiple
> vendors and pretty good consensus, so I don't think we'll have a problem
> converging on something very much like the current proposal. For questions
> about the formal status of the document, you'd have to ask on the list
> though.
>
> BTW you didn't say much about your actual application, but if data size is
> a concern then maybe you really should be using StreamRecorder with a
> proper audio codec. I would recommend Opus of course :-).
>
> Rob
> --
> Jesus called them together and said, “You know that the rulers of the
> Gentiles lord it over them, and their high officials exercise authority
> over them. Not so with you. Instead, whoever wants to become great among
> you must be your servant, and whoever wants to be first must be your
> slave — just as the Son of Man did not come to be served, but to serve,
> and to give his life as a ransom for many.” [Matthew 20:25-28]
>



-- 
Best regards,
He Shiming
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