[FFmpeg-user] g726 adpcm SDP description how to

Diaz Soho soho123.2012 at gmail.com
Mon Jun 30 07:58:11 CEST 2014

Hi All,

my audio source is : 22050 Hz, 1 channel , 16bit width
I would like to encode to g726 adpcm.
it seems workable when I use ffmpeg to encode to g726 adpcm.
but the bit rate is not 32 or  40kbps if sample rate is 22050Hz
in SDP DESCRIBE response:
a=rtpmap:97 G726-32/22050
a=rtpmap:97 G726-40/22050

can not decoded by VLC.
Since VLC can not output normal sound.

how to set the attribute for SDP when sample rate is 22050, 1 channel g726
adpcm for VLC ?
such that VLC can decode normally


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