refine the script, add build/run/stop

trunk/scripts/_step.start.ffmpeg.demo.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+src_dir='src'
+if [[ ! -d $src_dir ]]; then echo "错误：必须在src同目录执行脚本"; exit 1; fi
+
+cmd="nohup bash ./scripts/ffmpeg.demo.sh >./objs/logs/ffmpeg-demo.log 2>&1 &"
+echo "启动FFMPEG推送demo流(播放器上12路演示)：$cmd"
+pids=`ps aux|grep scripts|grep "/ffmpeg.demo.sh"|awk '{print $2}'`; for pid in $pids; do echo "结束现有进程：$pid"; kill -s SIGKILL $pid; done
+nohup bash ./scripts/ffmpeg.demo.sh >./objs/logs/ffmpeg-demo.log 2>&1 &
+ret=$?; if [[ 0 -ne $ret ]]; then echo "错误：启动FFMPEG推送demo流(播放器上12路演示)失败"; exit $ret; fi
+
+echo "启动FFMPEG推送demo流(播放器上12路演示)成功"
+exit 0