- nb_in = av_get_channel_layout_nb_channels(s->user_in_ch_layout);
- nb_out = av_get_channel_layout_nb_channels(s->user_out_ch_layout);
+ nb_in = (s->user_in_ch_count > 0) ? s->user_in_ch_count :
+ av_get_channel_layout_nb_channels(s->user_in_ch_layout);
+ nb_out = (s->user_out_ch_count > 0) ? s->user_out_ch_count :
+ av_get_channel_layout_nb_channels(s->user_out_ch_layout);