Hi Jim,
2015-06-10 17:33 GMT-05:00 <[email protected]>:
> I’m interested in sending voice quality data (bitrate=8) to HTML5 <audio>
> elements using Liquidsoap. Unfortunately, it doesn’t look like any of the
> mp3 varieties (fxp, vbr, abr) in Liquidsoap allow bitrate=8. I realize that
> speex uses bitrate=8, but MP3 is preferred because IE, Chrome, FF all
> support it in HTML5 (Windows 7).
>
>
>
> MPEG2 III states that it supports this bitrate, but Liquidsoap must be MPEG1
> III? Is there any way I can get this to work?
8 Kbps is only supported with MPEG II and MPEG 2.5 indeed. But, also,
MPEG II and 2.5 are only used for specific samplerate. Here's the
documentation:
/* Tables of supported audio parameters & format.
*
* Valid samplerates and bitrates.
* const int samplerates[9] = {
* 44100, 48000, 32000, // MPEG-I
* 22050, 24000, 16000, // MPEG-II
* 11025, 12000, 8000 // MPEG-2.5
* };
*
* const int bitrates[16][4] = {
* // MPEG version:
* // 2.5, reserved, II, I
* { -1, -1, -1, -1},
* { 8, -1, 8, 32},
* { 16, -1, 16, 40},
* { 24, -1, 24, 48},
* { 32, -1, 32, 56},
* { 40, -1, 40, 64},
* { 48, -1, 48, 80},
* { 56, -1, 56, 96},
* { 64, -1, 64, 112},
* { 80, -1, 80, 128},
* { 96, -1, 96, 160},
* {112, -1, 112, 192},
* {128, -1, 128, 224},
* {144, -1, 144, 256},
* {160, -1, 160, 320},
* { -1, -1, -1, -1}
* };
*
*/
So, you need to set the samplerate of your %mp3 encoder accordingly.
For instance, this works:
%mp3(bitrate=8,samplerate=22050)
and this as well:
%mp3(bitrate=8,samplerate=8000)
Romain
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