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• why 'read' command in shell script is missing initial characters ? [duplicate]

  15 avril 2019, par tod

  This question already has an answer here :

  • Shell script while read line loop stops after the first line
    
    3 answers
    

  I have the following shell script and it is missing some initial characters (it misses initial couple of characters, so far in my observation) from each line except the first line.

  And this happens only when I use the ffmpeg command. Otherwise, it is fine. But this command does the actual task in this script.

  Why is it so and what is the fix ?

  #!/bin/bash
  
  
  
  while read line; do
  
      printf "%s\n" "$line" 
  
      ifile=$line
  
      printf "%s\n" "$ifile" 
  
      ofile=abc_$line
  
      printf "%s\n" "$ofile" 
  
  
  
      ############### Problem is the following command: ##########
  
      ffmpeg -y -i $ifile -c:v libx264rgb -b:v 512k -bf 0 -pix_fmt rgb24  -r 25 -strict -2 $ofile
  
      ##########rest is fine##########
  
  
  
      echo $ifile
  
  done < file_list

• Shell script not working on a different server

  11 novembre 2013, par Alex Blundell

  I've just migrated a shell script to another server with similar specs (same CentOS version) but the following command seems to fail :

  find /home/removed/captures -name '*.avi' -exec ffmpeg -y -i {} -ab 1280 -b 1024000 {}.mp4 \;

  The following message gets returned :

  find: `ffmpeg': No such file or directory

  I have installed ffmpeg, and made sure it runs from the command line. I've also tried passing in the full path to ffmpeg instead of just 'ffmpeg'. Both ffmpeg versions are the same on each server. I was thinking it was something to do with syntax of the find program changing between versions, but they're both the same version too. This runs via the root crontab.

  The script does run by itself though if I call it directly. Could this be an issue with permissions ? It runs on a cPanel server.

  Thanks :)

• possible C code implementation ideas for a given shell script(related to ffmpeg)

  21 août 2011, par Ted

  The shell script i'm trying to implement goes like this,

      #!/bin/bash
  
      while [ 1 ]
  
      do
  
         nc -l 1234 | ffmpeg -i pipe:0 -vcodec mpeg4 -s qcif -f m4v -y pipe:1 | nc localhost 1235
  
      done 

  what it does is to simply take in a stream of video input through network and do live video transcoding(with ffmpeg of course !) and streaming back the video through the net. my question is how should i go by to implement this functionality in a clean C code. i know i can use popen() to pipe such a command from a c code but i would like to do better. may be with sockets and staff... any pointers are appreciated.

  AskLearnDo.