Don't know exactly, but https://trac.ffmpeg.org/ticket/1347 https://trac.ffmpeg.org/ticket/1347 looks like the ticket and http://git.videolan.org/?p=ffmpeg.git;

Don't know exactly, but https://trac.ffmpeg.org/ticket/1347 https://trac.ffmpeg.org/ticket/1347 looks like the ticket and http://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=8f66d46ce5f41be8084ad14061cec8f8e769d711 http://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=8f66d46... looks like the commit implementing it.