Thanks for the tip! Em qua., 21 de out. de 2020 às 10:57, Ricard Wanderlof <ricardw@xxxxxxxx> escreveu: > > On Tue, 20 Oct 2020, Amanda Ava Koci Pereira wrote: > > > Hi guys... > > > > We need some clues about to downmix 5.1 and 7.1 channels to 2 channels > > > > for the moment we are using the following code -> > > > > It works but fails miserably if all channels have data at same time > > > > Is the problem that you get clipping if there is audio on more than one > input channel? > > In general, if you sum a number (N)( of digital channels which have a > maximum amplitude of M, then the maximum amplitude of the sum will be N * > M. So in this case you need to reduce the output amplitude by 1/N if you > want to keep the maximum amplitude of the sum at M. > > So in your case you need to set > > > #define AR_K_P_ATTENUATION_LEVEL 1.0 > > according to the number of channels being downmixed per output channel. > > /Ricard > -- > Ricard Wolf Wanderlof ricardw(at)axis.com > Axis Communications AB, Lund, Sweden www.axis.com > Phone +46 46 272 2016 Fax +46 46 13 61 30 >
