Hi, I want you to point to this discussion:
https://trac.ffmpeg.org/ticket/7037#no1
There some user called "Balling" is referencing this thread multiple times; thinks there was a fix or something for a problem posted here, he got very upset that no one mentioned this here (he is not capable to post it himself for whatever reason). Yeah, so whatever... have a look yourself:
https://trac.ffmpeg.org/ticket/7037#comment:60 https://trac.ffmpeg.org/ticket/7037#comment:74