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• Parsing the STDERR output of node.js child_process line by line

  3 janvier 2012, par primer

  I'm writing a simple online conversion tool using FFMPEG and Node.js. I'm trying to figure out how to parse each line of the conversion output received from FFMPEG and only display pertinent results client side in the browser. In my case I want the encoding time counter that FFMPEG spits out on the command line.

  My function thus far is :

  function metric(ffmpeg, res) { 
  
  
  
    ffmpeg.stdout.on('data', function(data) {
  
       res.writeHead(200, {'content-type': 'text/html'});
  
       res.write('received upload:\n\n');
  
       console.log(data);
  
    });
  
  
  
    ffmpeg.stderr.on('data', function (data) {
  
       var temp += data.toString();
  
              var lines = temp.split('\n');
  
  
  
              //for debugging purposes
  
              for(var i = 0;icode>

  What this ends up returning is multiple arrays, each of which includes the data from the previous array as well as the next data chunk. For example, the function returns array 1 :0=>A, 1=>B, array 2 :0=>A, 1=>B, 2=>C, array 3 :0=>A, 1=>B, 2=>C, 3=>D, and so on.

  I'm quite new to Node so I'm probably missing something simple. Any guidance would be much appreciated !

• Why reading line by line and feeding ffmpeg removes leading character gradually ? [closed]

  27 juillet 2021, par Ibn Fulan

  As I was answering this question, I tried two ways to read my script to read timestamps line by line.

  


  #! /bin/bash
x="00:00:00"
z=0
filename=$(basename -- "$2")
ext="${filename##*.}"
while read y
do
echo $x
ffmpeg -hide_banner -loglevel error -i $2  -ss $x -to $y -c copy $filename$z.$ext
let "z=z+1"
x=$y 
done < $1



  


  And

  


  #! /bin/bash
x="00:00:00"
z=0
filename=$(basename -- "$2")
ext="${filename##*.}"
while IFS=, read -r y
do
echo $x
ffmpeg  -hide_banner -loglevel error -i $2  -ss $x -to $y -c copy $filename$z.$ext
let "z=z+1"
x=$y 
done < $1



  


  From this file

  


  00:02:30
00:04:40
00:07:00
00:09:00 
00:10:00


  


  In both they gradually start omitting first letter and then again start reading them

  


  00:00:00
00:02:30
0:04:40
0:07:00
:09:00 
00:10:00


  


  What's the proper way to read the file ?

  


• Changelog : add missing empty line after the version line

  16 février 2013, par Stefano Sabatini

  Changelog : add missing empty line after the version line