There&#x27;s a patchset for this feature being discussed on the mailing list:<p><a href="http:&#x2F;&#x2F;ffmpeg.org&#x2F;pipermail&#x2F;ffmpeg-devel&#x2F;2016-February&#x2F;189533.html" rel="nofollow">http:&#x2F;&#x2F;ffmpeg.org&#x2F;pipermail&#x2F;ffmpeg-devel&#x2F;2016-February&#x2F;18953...</a>