From saga_800 at 163.com  Tue Aug  7 06:00:13 2012
From: saga_800 at 163.com (Liu Rui)
Date: Tue, 7 Aug 2012 21:00:13 +0800
Subject: [Vorbis-dev] Help!
Message-ID: <000301cd749c$9778d0d0$c66a7270$@com>

Hello,

I'm a student now using libvorbis in my project. I aim to record voice
through APIs in winmm.lib in wav buffer, and than encode the raw data in wav
buffer and save as ogg file. The wav buffer is offered in a pipeline scheme,
and in order to save memory, when a wav buffer is full, I start a new thread
to process encoding through libvorbis. Problem is, when wav buffer is full
and encoding completes, I write the encoded buffer to an ogg file. But the
ogg file is not continuous, that is to say, the encoded datas from different
wav buffers has a gap that is clear enough to affect the performance of a
recorded voice. So I want to ask that how to avoid the gap between two ogg
steam that needed to write continuously in a ogg file. Thank you very much!

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From lists at eastcheap.org  Tue Aug  7 19:44:29 2012
From: lists at eastcheap.org (R.L. Horn)
Date: Tue, 7 Aug 2012 21:44:29 -0500 (CDT)
Subject: [Vorbis-dev] Help!
In-Reply-To: <000301cd749c$9778d0d0$c66a7270$@com>
References: <000301cd749c$9778d0d0$c66a7270$@com>
Message-ID: <alpine.LNX.2.00.1208072118340.1468@hani.compact.internal>

On Tue, 7 Aug 2012, Liu Rui wrote:

> So I want to ask that how to avoid the gap between two ogg steam that 
> needed to write continuously in a ogg file.

Vorbis streams are, to all intents and purposes, gapless.  I suspect that 
any gaps (i.e. unwanted silences) between streams are either present in 
the PCM data presented to the encoder, or you're failing to provide 
vorbis_analysis_wrote() with a zero-length chunk of audio to indicate EOS.

Or, it's a playback problem.

The closest thing I've experienced to what you've described is a minor, 
but audible, waveform discontinuity for quality values of around 3 or 
less, and that only in some pretty pathological cases.