str2fmt: don't crash when string isn't set
remove decoder's stop channel, frames channel is enough
drain the audio stream before finishing
fix another wrong Dclose issue
readme: update instructions
add a very basic audio support
rename mp4* to mc* (multimedia container)
av1 decoder proc: tell main thread we're finished
stream-related fixes
support MP4 container via mcfs
prepare for multiple streams support
fix a race condition
add a note re machines
readme: add contact
add more info to the readme
first version, playing AV1 ivf