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• Add multiple audio files to video at specific points using FFMPEG

  7 août 2012, par Pascal Beyeler

  I am trying to create a video out of a sequence of images and various audio files using FFmpeg. While it is no problem to create a video containing the sequence of images with the following command :

  ffmpeg -f image2 -i image%d.jpg video.mpg

  I haven't found a way yet to add audio files at specific points to the generated video.
  Is it possible to do something like :

  ffmpeg -f image2 -i image%d.jpg -i audio1.mp3 AT 10s -i audio2.mp3 AT 15s video.mpg

  Any help is much appreciated !

  EDIT :

  The solution in my case was to use sox as suggested by blahdiblah in the answer below. You first have to create an empty audio file as a starting point like that :

  sox -n -r 44100 -c 2 silence.wav trim 0.0 20.0

  This generates a 20 sec empty WAV file. After that you can mix the empty file with other audio files.

  sox -m silence.wav "|sox sound1.mp3 -p pad 0" "|sox sound2.mp3 -p pad 2" out.wav

  The final audio file has a duration of 20 seconds and plays sound1.mp3 right at the beginning and sound2.mp3 after 2 seconds.
  To combine the sequence of images with the audio file we can use FFmpeg.

  ffmpeg -i video_%05d.png -i out.wav -r 25 out.mp4

• Cropping black bars in video with ffmpeg on ubuntu changes video size

  9 décembre 2013, par pramod

  I have a source video size that's 720x576 with black rectangles on the top and bottom.

  I want to remove the black rectangles and set the output video size to 640x352.

  I tried -vf cropdetect and the value it gave was 640:192:0:80.

  However, putting that same value in crop=<parameter></parameter> changes the output video size.

  How can I fix this ?

  E.g. :

  ffmpeg -i all_the_best_test.mpg -s 640x352 -deinterlace -b 500k -minrate 500k \
  
  -maxrate 500k -aspect 1.82 -force_fps -vcodec libx264 -me_method 10 \
  
  -vf crop=640:192:0:80 -r 25 -acodec libfaac -ac 2 -ar 44100 -ab 96k -subq 6 \
  
  -vpre medium /vod/Movies/final/allthebest-crop-2.mp4

• how to fade two images with ffmpeg

  1er mai 2016, par steve

  I have two images and I want to create a simple fading transition between them.

  I also want the final output to be a sequence of images rather than a video ?
  So if the fading transition was 10 frames long I’d want the output to be a sequence of 10 images.

  How can I achieve this with ffmpeg ?