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• Zoom and Moving based on audio information in FFMPEG

  19 décembre 2019, par Mattstir

  I recently wondered if it is possible to zoom or move things in FFMPEG based on an audio source.

  I already played around with complex filters as they allow some audio visualization but didn’t really manage to move/zoom things based on sound. See good examples of complex filters used for audio visualization at : https://hhsprings.bitbucket.io/docs/programming/examples/ffmpeg/audio_visualization/index.html

  My current situation is that i have multiple inputs which one of should react on sound/maybe even on special frequency’s.

• FFMpeg Add multiple Gifs/Watermarks to a video

  14 mai 2022, par Gia

  I'm trying to add various Gifs/Watermarks to a video, but I'm having a problem getting it to work properly.

  


  We're assuming the video is 60 seconds long and I'm adding one Gif image. The output looks correct, the sound is on, the gif animates, and the video doesn't stop. here is the code :

  


              add("-i")
            add("inputVideo.mp4")
            add("-stream_loop")
            add("-1")
            add("-i")
            add("gif_1.gif")
            add("-filter_complex")
            add("[0][1]overlay=x=18:y=461:shortest=1[out]) 
            add("-map")
            add("[out]")
            add("-map")
            add("0:a?") 
            add("-qscale:v")
            add("1")
            add("-preset")
            add("ultrafast")
            add("outputVideo.mp4")


  


  When I try to add multiple GIFs, the video plays and the sound is on, one GIF animates, but the rest of the GIFs finish animating very early. this is the code

  


              add("-i")
            add("inputVideo.mp4")
            add("-stream_loop")
            add("-1")
            add("-i")
            add("gif_1.gif")
            add("-i")
            add("gif_2.gif")
            add("-i")
            add("gif_3.gif")
            add("-filter_complex")
            add("[0][1]overlay=x=47:y=106:shortest=1[t1];[t1][2]overlay=x=551:y=1190[t2];[t2][3]overlay=x=-82:y=1279[out]) 
            add("-map")
            add("[out]")
            add("-map")
            add("0:a?") 
            add("-qscale:v")
            add("1")
            add("-preset")
            add("ultrafast")
            add("outputVideo.mp4")


  


  What can I do to have all random GIFs added to animate while the video is playing for the full 60 seconds ?

  


• ffmpeg correct audio streams when appending

  28 janvier 2013, par brux

  I am appending 2 mp4 files together using the following routine :

  ffmpeg -y -i one.mp4 -vcodec copy -vbsf h264_mp4toannexb -acodec copy one.ts
  
  ffmpeg -y -i two.mp4 -vcodec copy -vbsf h264_mp4toannexb -acodec copy two.ts
  
  
  
  cat one.ts two.ts >> joined.ts
  
  
  
  ffmpeg -y -i joined.ts -vcodec copy -acodec copy -absf aac_adtstoasc joined.mp4

  This works fine, however when one.mp4 has no audio stream (the file is created using ffmpeg from a single jpeg, so no sound), the routine appends the files but the audio of two.mp4 starts at the beginning of the video. how should I solve this problem ? Should I add switches to my append routine so that the audio in two.mp4 starts playing where it should, or should I add something to the ffmpeg command which creates the video from jpg ?

  here is the command I use to create one.mp4 which contains no sound :

  ffmpeg -y -loop 1 -i blah.jpg -t 3 -vcodec libx264 one.mp4