"While trying to duplicate Touradj’s results, we discovered that the early version of libvpx ( November 2013) he used, had a bug that produced invalid vp9 bitst

"While trying to duplicate Touradj’s results, we discovered that the early version of libvpx ( November 2013) he used, had a bug that produced invalid vp9 bitstreams and encoder / decoder mismatches with the settings he used. " -- James Bankoski, Director at Google, former CTO of On2