This is pretty funny, kinda suggests they have no faith in the engineers they work with... ffmpeg is an awesome piece of work, but if it's a bug they can repeat to some level, then like you said, it 100% a them problem!
E: oh, was thinking it was a pm raised it, but seems it was possibly one of their developers, brutal....
Hmmm this clearly hasn't been long in the planning
E: I hope it's another fuck up (in their terms), but you never know ..