Add YouTube avformat consumer preset.
Add YouTube avformat consumer preset.

mltframework/mlt,xzhavilla/mlt,j-b-m/mlt,j-b-m/mlt,siddharudh/mlt,mltframework/mlt,mltframework/mlt,j-b-m/mlt,siddharudh/mlt,j-b-m/mlt,j-b-m/mlt,j-b-m/mlt,siddharudh/mlt,siddharudh/mlt,mltframework/mlt,mltframework/mlt,j-b-m/mlt,j-b-m/mlt,xzhavilla/mlt,siddharudh/mlt,j-b-m/mlt,siddharudh/mlt,siddharudh/mlt,mltframework/mlt,xzhavilla/mlt,mltframework/mlt,xzhavilla/mlt,mltframework/mlt,xzhavilla/mlt,xzhavilla/mlt,mltframework/mlt,j-b-m/mlt,siddharudh/mlt,mltframework/mlt,xzhavilla/mlt,siddharudh/mlt,xzhavilla/mlt,xzhavilla/mlt