Also increase audio_buffer default in sdl_audio.
Also increase audio_buffer default in sdl_audio.

ttill/MLT,mltframework/mlt,siddharudh/mlt,gmarco/mlt-orig,gmarco/mlt-orig,anba8005/mlt,ttill/MLT-roto-tracking,ttill/MLT,mltframework/mlt,anba8005/mlt,gmarco/mlt-orig,mltframework/mlt,siddharudh/mlt,xzhavilla/mlt,ttill/MLT-roto-tracking,ttill/MLT-roto-tracking,zzhhui/mlt,ttill/MLT,ttill/MLT-roto-tracking,ttill/MLT-roto-tracking,mltframework/mlt,j-b-m/mlt,wideioltd/mlt,ttill/MLT,gmarco/mlt-orig,anba8005/mlt,anba8005/mlt,anba8005/mlt,wideioltd/mlt,xzhavilla/mlt,xzhavilla/mlt,xzhavilla/mlt,zzhhui/mlt,anba8005/mlt,ttill/MLT,mltframework/mlt,xzhavilla/mlt,gmarco/mlt-orig,mltframework/mlt,anba8005/mlt,xzhavilla/mlt,ttill/MLT-roto-tracking,mltframework/mlt,wideioltd/mlt,zzhhui/mlt,xzhavilla/mlt,wideioltd/mlt,anba8005/mlt,zzhhui/mlt,siddharudh/mlt,j-b-m/mlt,wideioltd/mlt,wideioltd/mlt,ttill/MLT,mltframework/mlt,mltframework/mlt,j-b-m/mlt,ttill/MLT-roto-tracking,gmarco/mlt-orig,zzhhui/mlt,siddharudh/mlt,j-b-m/mlt,zzhhui/mlt,xzhavilla/mlt,xzhavilla/mlt,siddharudh/mlt,siddharudh/mlt,j-b-m/mlt,j-b-m/mlt,mltframework/mlt,gmarco/mlt-orig,wideioltd/mlt,wideioltd/mlt,zzhhui/mlt,ttill/MLT,siddharudh/mlt,j-b-m/mlt,siddharudh/mlt,wideioltd/mlt,gmarco/mlt-orig,j-b-m/mlt,j-b-m/mlt,gmarco/mlt-orig,ttill/MLT-roto-tracking,zzhhui/mlt,ttill/MLT,ttill/MLT,zzhhui/mlt,j-b-m/mlt,siddharudh/mlt,anba8005/mlt,ttill/MLT-roto-tracking