Add SampleAspectRatioNum/SampleAspectRatioDen elements#1078

arch1t3cht wants to merge 1 commit intoietf-wg-cellar:masterietf-wg-cellar/matroska-specification:masterfrom

arch1t3cht:sample-aspect-ratioarch1t3cht/matroska-specification:sample-aspect-ratioCopy head branch name to clipboard