Run Continous Process from Node.js

Question

The point of the server is to be able to pick a webcam and stream it, along with a few other things I already have working. I am trying to run a continuous process (mjpg-streamer) from within a node.js server. The node.js server is handling a serving a HTML page that has a select drop down binded to a javascript function to send a command to the server via socket.io. The drop down lets me select video0, video1, and none. However, whenever I try to run the server it refuses saying everything after the a particular block of code is unreachable or the code gets stuck running an infinite process. How can I execute this without locking up the server? Here is the code that causes the problem:

child = exec("video0.sh", function (error, stdout, stderr) {
sys.print('stdout: ' + stdout);
sys.print('stderr: ' + stderr);
if (error !== null) {
  console.log('exec error: ' + error);
}

The bash script video0.sh is:

cd mjpg-streamer/mjpg-streamer ;
export LD_LIBRARY_PATH=. ;
./mjpg_streamer -o "output_http.so -w ./www -p 8080" -i "input_uvc.so -d /dev/video0";

This may be obvious, but something a lot of people have done(including me). Did you set the sh script to be executable? chmod +x video0.sh? — tsturzl
– tsturzl, Commented Feb 6, 2014 at 6:20

BMW · Accepted Answer · 2014-02-06 04:10:25Z

1

you can set a infinite loop in pure shell directly

#!/usr/bin/bash

cd mjpg-streamer/mjpg-streamer ;
export LD_LIBRARY_PATH=. ;
while :
do
  ./mjpg_streamer -o "output_http.so -w ./www -p 8080" -i "input_uvc.so -d /dev/video0";
  sleep 5
done

answered Feb 6, 2014 at 4:10

BMW

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McNally Paulo · Accepted Answer · 2014-02-06 05:31:06Z

0

child = exec("sh video0.sh", function (error, stdout, stderr) {
  sys.print('stdout: ' + stdout);
  sys.print('stderr: ' + stderr);
  if (error !== null) {
   console.log('exec error: ' + error);
   }

answered Feb 6, 2014 at 5:31

McNally Paulo

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