[FFmpeg-user] AMRDecSpecStruc is missing in 3gp file generated by ffmpeg

[prashantha S]

Hi,

I used the following command to generate a amrwb .3gp audio file
ffmpeg.exe -i 1.wav -ar 16000 -ab 19.85k -acodec libvo_amrwbenc test1.3gp

But dawr/dawb atom is missing in the clips generated by ffmpeg

I think it should be set as defined below
TS 26.244 define the

struct AMRDecSpecStruc{
 Unsigned int (32) vendor
 Unsigned int (8) decoder_version
 Unsigned int (16) mode_set
 Unsigned int (8) mode_change_period
 Unsigned int (8) frames_per_sample
}

How we can resolve this issue?

Thank you
Prashantha S