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• ffmpeg capture single window screen freezes with only mouse working

  2 septembre 2015, par Saad Abdullah

  Scenario and Problem :
  I have two machines with windows 8.1 installed. On one computer, every thing works fine with video recording by using gdigrab to capture a window by title. But on the other pc, the desktop recording works fine, but when it comes to capture single window by title, the video freezes with only mouse working. (to be exact, if i play webcam or images in the window being captured, it records the content too, but when some video is played it starts showing black screen or freezed at first frame.

  Commandline :
  here is the commandline args

  ffmpeg -f gdigrab -framerate 30 -i title="Video - VLC media player" germ.flv

  What can be the issue on the other pc ?

• ffmpeg : several audio files + several images = 1 video ?

  18 octobre 2012, par user1752708

  I have about 500 audio clips and 500 images that I need to put together for a project I'm working on. Each video is made up of a number of audio clips and images. The order is already set by the naming (audio01.mp3 goes with image01.tiff etc). They files are divided into several folders named Chapter1, Chapter2 [...] Chapter12. The number of files in each folder differs, but the naming scheme is the same in each folder.

  Each image will need to have the same exact duration as its partner audio file.

  What is the best way of doing this ? I've found ways of putting together 1 image with 1 audio file (http://stackoverflow.com/questions/5887311/ffmpeg-1-image-1-audio-file-1-video) or several images with one audio file (http://superuser.com/questions/356974/how-to-turn-images-into-a-video-slideshow-with-sound/356982#356982) but nothing that does exactly what I want.

  I'd appreciate any help you could give me !

• Bash script not finding files

  9 septembre 2017, par user2751809

  I am writing a simple script to iterate over all the m4a files in a folder and encode them to mp3. I want to do the encoding of the files in different threads to increase the speed of execution and take advantage of all the cores in my PC, so I am sending the tasks to background, please advice me if this is the right approach.
  Anyway, I am getting a No such file or direcory error for every single file that I want to encode, even though the file is there ; and the funny thing is that if I copy the exact same instruction to a terminal, it will be executed correctly. Can you please help me to find out what am I doing wrong ?

  Thanks in advance.

  #!/bin/bash
  
  
  
  function encode {
  
      echo "<<<<<<<<<<< encode >>>>>>>>>>>>>>>>"
  
      cd "$1"
  
      find . -mindepth 1 -maxdepth 1 | while read f
  
      do
  
          if [ -f "${f}" ]
  
          then
  
              if [ ${f: -4} == ".m4a" ]
  
              then
  
                  if [ ! -d "converted" ]
  
                  then
  
                      mkdir converted
  
                  fi
  
                  newPath="${f%m4a}mp3"
  
                  echo "ffmpeg -i \""$f"\" -ac 2 -b:a 320k -y \""$newPath"\" null >/dev/null &"
  
                  ffmpeg -i \""$f"\" -ac 2 -b:a 320k -y \""$newPath"\" null >/dev/null &
  
              fi
  
          elif [ -d "${f}" ]
  
          then
  
              echo "folder $f"
  
              encode "$f"
  
          fi
  
      done
  
  }
  
  
  
  
  
  encode "$1"