Flash AS3 - How to set high quality audio recordin

问题:

Currently, I'm using

mic.rate = 100;

This only gives 63kbps.

Is it possible for Flash AS3 to set bitrate higher than 63kbps?

回答1:

From the docs

Acceptable values are 5, 8, 11, 22, and 44

So enter one of those.

And it's measured in kHz, not kbps, also according to the docs

回答2:

It's flash. Great quality also depends on users' hardware. You didn't post full settings for your microphone. Also value that you are using isn't valid.

Here a small snippet, for mic settings, that will give you good enough results:

var micOptions : MicrophoneEnhancedOptions = new MicrophoneEnhancedOptions();
micOptions.echoPath = 128;
micOptions.mode = MicrophoneEnhancedMode.FULL_DUPLEX;
micOptions.nonLinearProcessing = true;
microphone.setSilenceLevel(0);
microphone.rate = 44;
microphone.enhancedOptions = micOptions;

回答3:

The bit rate (kbps) depends on:

1. the audio codec used (NellyMoser's Asao or Speex)
2. the Asao sample rate (mic.rate) / the Speex encode quality (mic.encodeQuality) .

NellyMoser's Asao

With Asao the sound will use from 11 to 88kbps depending on the sampling rate:

There's also a third factor with Nellymoser Asao:

When using the Nellymoser codec, one microphone might produce more bandwidth over against another.

Speex

With Speex the sound will use from 4 to 42kbps depending on the encoding quality (sampling rate is fixed at 16kHz with Speex):

From: http://audior.ec/blog/audio-quality-and-bitrate-in-flash-as3-web-apps/

These bitrates should reflect in the .flv where the audio is stored/recorded.