The libav side have consistently refused to merge code from the ffmpeg side of the split, including security fixes, have written their own incompatible versions of any APIs the ffmpeg developers come up with, and been generally hostile, and he's the one that's had to deal with the mess for the past several years.
"Refused" ? In Libav any patch has to go through review, anything that had been put in review had been managed as any other patches by any other sources.
if everything that somebody from the libav side says here is automatically labelled bitterness and downvoted, maybe you can understand why some are indeed bitter.
