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...ytes of payload length four bytes of timestamp and three bytes of stream ID. The first byte of the payload for audio message is the format byte and the rest of the byte is the payload. Jozsef ----- Original Message ---- From: Jeff Ramin <jeff.ramin at singlewire.com> To: Jozsef Vass <jozsef_vass at yahoo.com> Cc: speex-dev at xiph.org Sent: Wed, November 18, 2009 6:09:56 AM Subject: Re: jspeex question Is there a document somewhere that describes speex-encoded FLV files? What is a TC message? Thanks. Jozsef Vass wrote: > FLV contains TC messages? TC message payload contains a fo...

...p and three bytes of stream ID. > > The first byte of the payload for audio message is the format byte and the rest of the byte is the payload. > > Jozsef > > > > ----- Original Message ---- > From: Jeff Ramin <jeff.ramin at singlewire.com> > To: Jozsef Vass <jozsef_vass at yahoo.com> > Cc: speex-dev at xiph.org > Sent: Wed, November 18, 2009 6:09:56 AM > Subject: Re: jspeex question > > > Is there a document somewhere that describes speex-encoded FLV files? > What is a TC message? > > Thanks. > > > Jozsef Vass wrote: >...

Flash player encodes speex at 16 kHz, mono, 16 bit. Fields in the format byte should be ignored if the format is speex. You can set the quality by Microphone.encodeQuality (default 6). You can also set the number of speex frames per tc message using Microphone.framesPerPacket. Flash player can only decode speex at 16 kHz, so make sure you have the proper sample rate. Jozsef > > Message:

FLV contains TC messages? TC message payload contains a format byte and speex frames (up to eight). In the format byte 0xb0 indicates speex. Speex is always 16 kHz, 16 bit, mono. Jozsef Message: 1 Date: Mon, 16 Nov 2009 14:40:20 -0600 From: Jeff Ramin <jeff.ramin at singlewire.com> Subject: [Speex-dev] jspeex question To: speex-dev at xiph.org Message-ID: <4B01B8B4.8020904 at

Flash does support interactive audio/video, not only streaming. And there is a new protocol called RTMFP in flash 10, which is on top of UDP. For voice application, see Connect Now (www.acrobat.com) Jozsef Message: 2 Date: Fri, 03 Oct 2008 16:54:53 +0200 From: Tor-Einar Jarnbjo <tor-einar at jarnbjo.name> Subject: Re: [Speex-dev] Fwd: [Vorbis-dev] Flash Vorbis player To: Ivo Emanuel

I have run into the same issue. Before sending a frame to encoder, I calculate the energy. If it is less than a small threshold, I simply replace this frame with "silence frame," which is 320 random samples of values smaller than 3 (16 kHz). BTW, I have only experience this problem with certain USB headsets that provide you all 0 samples when muted. Jozsef

Hi Jean-Marc I am using speex in my voip app (wideband mode). I have noticed that when VAD kicks in, CPU considerably increases (bitrate decreases to 4 kbps). It takes about 7 ms to encode one frame versus 0.5 ms (for speech). This happens regardless preprocessor is used. Although the issue seems to be driver dependent, it occurs on XP, Vista and Mac OS X. Besides complexity and quality, this