some modify.
(1)30sec delay before crtmpserver. if the delay is not enough, the g_startime and timestamps while not correct.
(2)when arecord used with nohup, when power on auto run, the noise will occur. so del the nohup in stream_run.sh.
(3)let the aac timetamps get in CAacEncoder.
caputre sound by myself. when >./log.txt,sound capture overrun will occur.