Hi, You can get it from Decoder_specific_info presented in ES_Descriptor of partricular audio track. regards, naidu On Thu, 5 Dec 2002, Mahendran, Shanmuga Sundaram wrote: > Hi, > > How to get number of channels of audio stream present in MPEG4 file format > file? > > >From where can I get 3GPP files? > > Regards, > Shanmuga Sundaram M. > > >