CODEC_CAP_FRAME_THREADS is not added yet because that would
unconditionally enable it, breaking gop>1 files.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This is not based on lucas work due to code divergence (its less work this way
than trying to merge from a split based on 2 years outdated code)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>