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• OpenCV video writing to named pipe

  21 janvier 2012, par user28667

  I'm trying to send videos created with OpenCV in real-time to user though Apache (user downloads video from a website). I don't need streaming video. I'm just trying to transfer whole video file. My OpenCV program writes video to a named pipe (created with mkfifo) and PHP scrpt reads from it and outputs to user.

  The problem is that pipe-transfered videos doesn't open in Windows. They're shorter exactly at 7072 bytes (checked with different videos). They are not just truncated. The first difference between videos appeared in 5-th byte. And there is no mistake in PHP script. I've checked it using :

  cat fifo.avi > output.avi

  The result was the same. How to make OpenCV write videos to pipes just as to normal files ? Why this happens ? Or is there another way to send videos in real-time to user ?

  P. S. Thanks and sorry for bad English
  P. P. S. I'm creating CvVideoWriter with this code if it matters :

  cvCreateVideoWriter("fifo.avi",CV_FOURCC('M','J','P','G'),25,cvSize(blah blah blah),1)

• Centos : TERM environment Variable Not Set

  21 janvier 2014, par Architact

  I am working on a mobile application which allows users to upload videos, upon upload the videos are converted to mp4 format, I am using a shell script for that purpose, the script was working fine on our last server but we switched our server and now it has stopped working, the log files of apache are printing.

  [Tue Jan 21 00:57:37.003944 2014] [:error] TERM environment variable not set.
  
  [Tue Jan 21 00:57:37.148531 2014] [:error] ./script.sh: line 3: ffmpeg: command not found
  
  [Tue Jan 21 00:57:37.148794 2014] [:error] script.sh: line 4: ffmpeg: command not found

  The content of script.sh are

  #!/bin/bash -p
  
  clear
  
  ffmpeg -i $filename -strict experimental -ar 22050 converted.mp4<br />
  
  ffmpeg -itsoffset -1 -i  converted.mp4 -vframes 25 -filter:v scale="min(500\, iw):-1"  thumbnail.png

  I am calling the script form php using

  shell_exec("script.sh 52567afa374c61381399290.mp4");

  Any help would be greatly appreciated.

  Thanks

• FFMpeg installation in Ubuntu 12.04 and using it in PHP-FFMpeg

  16 mai 2015, par SohelAhmedM

  I have tried many many failed attempt to install FFMpeg in my Ubuntu 12.04.
  I used following links : 1, 2, 3 and many others.

  Then I need to use it in PHP-FFMpeg
  And Then I need to deploy in Linux based server. This is my requirement.

  But after much trying, I just downloaded static build through this link.

  This helped me to successfully convert video and use FFMpeg through terminal in Ubuntu. But I cannot use it through PHP-FFMpeg library which I need to run. In docs of PHP-FFMpeg it is written
  

  This library requires a working FFMpeg install. You will need both
  FFMpeg and FFProbe binaries to use it. Be sure that these binaries can
  be located with system PATH to get the benefit of the binary
  detection, otherwise you should have to explicitely give the binaries
  path on load.

  and I am not getting this.