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• Apply batch script to selected video file

  4 mars 2017, par Arete

  I use the following ffmpeg batch file to trim videos

  Trim Video Files.bat

  set /p startposition=Enter the start position:
  
  set /p endposition=Enter the end position:
  
  ffmpeg -i in.mp4 -ss %startposition% -t %endposition% cut.mp4
  
  pause

  This works only if the input file is named ’in.mp4’, however I would like to be able to just select a video file and drag and drop it on the batch script. In other words how can I make this batch file apply to the selected file only ?

• How can I combine two separate scripts being piped together to make one script instead of two ?

  29 mars 2016, par user556068

  I have two scripts that I pipe together. script1.sh | script2.sh Originally they were part of the same but I could never make it work correctly. The last part of script1 calls on youtube-dl to read a batch file and outputs a list urls into the terminal. Note the trailing - allows youtube-dl to read from stdin.

   cat $HOME/file2.txt | youtube-dl --ignore-config -iga -

  And script2 begins with :

  while read -r input
  
  do
  
  ffmpeg [arg] [input] [arg2] [output]

  What am I not seeing that is causing the script to hang when the two halves are combined yet work if one is piped into the other ?

  EDIT - It’s kind of funny how the answer is in the question.. Live and learn.

• run ffmpeg from PHP web script

  18 février 2014, par it6

  I need to manage the recording/capture of a website mindwhile it is running a slide-show to get videos form these slides.

  My approach is :

  <?php 
  
  
  
  define('FFMPEG_LIBRARY', '/usr/bin/ffmpeg ');
  
  
  
  $ffmpegcmd = "ffmpeg -f x11grab -r 25 -s 800x600 -i :0.0 /tmp/output.mpg";
  
  
  
  shell_exec($ffmpegcmd);  
  
  
  
  ?>

  But i get this error from php error log :

  [x11grab @ 0x81e8aa0] device: :0.0 -> display: :0.0 x: 0 y: 0 width: 800 height: 600
  
  No protocol specified
  
  No protocol specified
  
  [x11grab @ 0x81e8aa0] Could not open X display.
  
  :0.0: Input/output error

  Similar command from console run good.

  Please, any help to get display and be able to control ffmpeg from browser php script ?

  Thanks in advance.

  ---

  thanks for your time.

  I got rid the X display error, but not I still haven't got the capture.

  Using xvfb I get an unknown file at /tmp written by www-data user :
   rw-r—r— 1 www-data www-data 11252 Sep 12 09:49 server-B20D7FC79C7F597315E3E501AEF10E0D866E8E92.xkm

  Running startx I got also an unknown file at /tmp
   rw------- 1 www-data www-data 59 Sep 12 09:53 serverauth.oLcFlG7tXC

  any of both grow in size so it is not capturing anything. The content is some binary thing.
  What are those files about ?

  What I am trying is to write a script in which I can control the time ffmpeg is capturing the desktop to create a video from a jquery slide displayed on a website.

  My try from console is closer, but if I can do it by browser I will be able to know when to stop sending an AJAX request once the slide is finished.

  This is my try from console :

  #!/bin/bash
  
  
  
  # start the slide website: I will need to change it to control by querystring the language and course level
  
  firefox http://www.languagecourse.net/vocabulary-trainer.php &
  
  # start recording: I will need to adjust the frame to capture
  
  ffmpeg -f x11grab -r 25 -s 800x600 -i :0.0 /tmp/output2.mpg &
  
  # since I can't control the time a course takes I pause an arbitrary time
  
  sleep 5
  
  # look for the capture PID and close it
  
  for i in $(ps aux | grep ffmpeg | sed "s/  */#/g" | cut -f2 -d#)
  
  do
  
    echo "proceso $i killed"
  
    kill -9 $i
  
  done

  I wonder once the website is opened I can continue doing the control from AJAX, but not know if I will be able to get the ffmpeg PID to stop the command.

  I will appreciate any kind of comments.

  Regards,
  ·_-