在用户输入上停止avconv Bash脚本并继续循环 [英] Stop avconv Bash script on user input and continue loop

问题描述

基本上（希望如此），我想从网络摄像头录制视频流并将其保存在特定目录中，然后在用户输入一些数字时将其杀死。我的解释不是很好，所以这是我目前正在做的事情：

Basically (hopefully) I want to record a video stream from a webcam and save it in a specific directory, then kill that when a user inputs some numbers. I'm not explaining this well so here's what I'm doing currently:

#!/bin/bash

while true
do

TIMESTAMP=$(date +"%Y.%m.%d_%H.%M")

read -p "Enter your number here: " YOURNUMBER

echo -e "Saving video stream:"

mkdir /home/$USER/orders/$YOURNUMBER

avconv -f video4linux2 -r 3 -fs 52428800 -i /dev/video0 /home/$USER/orders/$YOURNUMBER/$TIMESTAMP-$YOURNUMBER.avi

echo -e "Video complete!"

done

所以我想停止录制并开始新的录制在新的$ YOURNUMBER文件夹中。有任何想法吗？ （对此非常陌生。请耐心等待！）

So I want to stop the recording and start a new on in the new $YOURNUMBER folder. Any ideas? (Quite new to this..be patient!)

更新：

感谢@TrueY

更新后的脚本（不需要mkdir如此删除）：

Updated script (don't need to mkdir really so taken that out):

CPID=0
while :; do
  read -p "Enter your number here: " YOURNUMBER
  [ $CPID -ne 0 ] && kill -INT $CPID
  TIMESTAMP=$(date +"%Y.%m.%d_%H.%M")
  avconv -f video4linux2 -r 3 -fs 52428800 -i /dev/video0 /home/$USER/orders/$YOURNUMBER[packed-$TIMESTAMP].avi > /dev/null 2>&1 &
  CPID=$!
done

唯一的麻烦是我（或最终用户）必须输入数字两次，然后再次开始记录。.

Only trouble is that I (or the end user) has to enter the number twice before it starts recording it again..

推荐答案

更新

尝试类似的操作（对OP的代码进行一些修改）：

Try something like this (OP's code modified a little bit):

#!/usr/bin/bash

stop() { [ $CPID -ne 0 ] && kill -INT $CPID && wait $CPID && echo "Killed $CPID"; }

trap "stop; exit" INT

CPID=0
while :; do
  read -p "Enter your number here: " YOURNUMBER
  stop
  [ "$YOURNUMBER" == quit ] && break;
  TIMESTAMP=$(date +"%Y.%m.%d_%H.%M")
  avconv -f video4linux2 -r 3 -fs 52428800 -i /dev/video0 /home/$USER/orders/$YOURNUMBER/$TIMESTAMP-$YOURNUMBER.avi&
  CPID=$!
  echo -e "Video complete!"
done

此操作开始 avconv ，以便用户可以输入新号码。也许avconv 应该重定向到日志文件或/ dev / null。此外，还应该测试哪个信号会优雅地停止 avconv 。 -INT 等同于ctrl + c。它不起作用，请尝试 -HUP ， -TERM 甚至是 -Kill 如果没有其他帮助。也许您应该实施陷阱来捕获 INT 信号，以杀死最后一个 avconv 如果按下ctrl + c，则将其按下。

This starts avconv in the background so the user can enter a new number. Maybe the stdout and stderr of avconv should be redirected to a log file or to /dev/null. Also it should be tested which signal stops avconv gracefully. -INT is equivalent to ctrl+c. It it does not work, try -HUP, -TERM or even -KILL if nothing else helps. Maybe You should implement a trap to catch INT signals to kill the last avconv it ctrl+c is pressed.

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