fix playing audio with 0 channels
fix playing audio with 0 channels

mltframework/mlt,wideioltd/mlt,zzhhui/mlt,gmarco/mlt-orig,siddharudh/mlt,j-b-m/mlt,mltframework/mlt,anba8005/mlt,anba8005/mlt,gmarco/mlt-orig,j-b-m/mlt,mltframework/mlt,anba8005/mlt,wideioltd/mlt,wideioltd/mlt,anba8005/mlt,gmarco/mlt-orig,wideioltd/mlt,siddharudh/mlt,wideioltd/mlt,xzhavilla/mlt,mltframework/mlt,anba8005/mlt,mltframework/mlt,anba8005/mlt,xzhavilla/mlt,gmarco/mlt-orig,xzhavilla/mlt,xzhavilla/mlt,zzhhui/mlt,anba8005/mlt,wideioltd/mlt,gmarco/mlt-orig,zzhhui/mlt,mltframework/mlt,mltframework/mlt,j-b-m/mlt,siddharudh/mlt,zzhhui/mlt,siddharudh/mlt,wideioltd/mlt,wideioltd/mlt,mltframework/mlt,zzhhui/mlt,j-b-m/mlt,zzhhui/mlt,anba8005/mlt,j-b-m/mlt,anba8005/mlt,j-b-m/mlt,siddharudh/mlt,j-b-m/mlt,gmarco/mlt-orig,j-b-m/mlt,xzhavilla/mlt,gmarco/mlt-orig,xzhavilla/mlt,mltframework/mlt,zzhhui/mlt,j-b-m/mlt,wideioltd/mlt,gmarco/mlt-orig,siddharudh/mlt,j-b-m/mlt,zzhhui/mlt,gmarco/mlt-orig,siddharudh/mlt,siddharudh/mlt,xzhavilla/mlt,zzhhui/mlt,xzhavilla/mlt,mltframework/mlt,xzhavilla/mlt,siddharudh/mlt