extend the image if its size is not modulo 16

give up on weird shit

much betta

exit cleanly; print average fps when debug is enabled

copy_wh: specify for w == 4

add arm64 builtins

treat a8r8g8b8 as x8r8g8b8

fix flush on note and remove fps printout

start time from epoch

allow non-multiple-of-16 sizes (fixes cropping too) since we're allocating frame stuff properly anyway

default GOP to fps×2

change -O to -o: disable optimization by default (twitch stream craps out)

ignore closed pipe writes to exit properly

procrfork & threadexitsall

not WIP anymore, seems to work fine

add -O option to disable optimizations

encoder thread: compare each frame to the previous one and discard if the contents are the same

builtins/amd64: sync clz, use MOVL in bswap32

default to lowest quality and gop to every two seconds

ivf: write header and flush first, then proceed with reading images