file /home/wsh/frescor/demo/build-no-frsh/_compiled/bin/recorder
#b url_fopen
#b url_fdopen
#b file_open
#b av_interleaved_write_frame
#b file_write
b file_read
#run -s 640x480 -r 15 -f video4linux2 -i /dev/video0
run -i snapshot%02d.png -y stream.mp4