GCC supports 'long long' since essentially forever.
Don't use two GPRs to store two words from xmm registers; shuffle these words so that they are fit into one GPR.
Implement ff_ssl_*_key_cert()
This can lead to confusion when trying to decide if the file contains an explicit duration, since we end up with a track who last event has a non-zero delta time from the previous one.
The b_adapt option allows users to control adaptive B-frame decision when lookahead is enabled in HEVC encoding.