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• How to make doppler effect on audio with ffmpeg [duplicate]

  3 janvier 2019, par Adam Estel

  This question already has an answer here :

  • FFmpeg : How to create rotating 3D(haas) effect in mp3 using ffmpeg ?
    
    1 answer
    

  How can i make the doppler effect on audio with ffmpeg.I mean : Sound run from left to right and opposite, just like this video :
  https://www.youtube.com/watch?v=j35K4QC_9bM
  I research ffmpeg for a while but I can’t firgure the audio filter i can start with
  Thank you for helping me
  Have a nice day.

• ffmpeg how to do the "earrape" sound effect

  20 avril 2020, par Shalin Shah

  I was wondering how to do the earrape effect using ffmpeg where the audio just sounds completely destroyed. Here's an example :
https://www.youtube.com/watch?v=KiCmvQiAC8Q

  



  I've tried a bunch of combinations of different commands on ffmpeg and the closest I've gotten is the following (where I use the superequalizer and then make the volume super high) :

  



  import ffmpeg
(
    ffmpeg
    .input('shark.wav')
    .filter("superequalizer", 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20)
    .filter("volume", 10)
    .output('output_earrape.wav')
    .run()
)


  



  I'm using a python wrapper but here's the command line equivalent :

  



  ffmpeg -i shark.wav -af "superequalizer=1b=20:2b=20:3b=20:4b=20:5b=20:6b=20:7b=20:8b=20:9b=20:10b=20:11b=20:12b=20:13b=20:14b=20:15b=20:16b=20:17b=20:18b=20,volume=10" output_earrape.wav


  



  The problem with the above is that it doesn't do anything for files that aren't already super loud (such as recorded audio) and most of the time the audio actually just ends up clipping and then being super soft.

  



  Does anyone have suggestions on how to do this effect ? Thanks !

  


• How to make video loop properly ?

  28 mai 2019, par woopwoop399

  I want to play this video in a loop https://www.nicovideo.jp/watch/sm16617386 . I want to play an mp4 file in such a way, that whenever it gets to some point in the video (let’s say, 30.3 seconds), it will loop back (to for example 5.85 seconds).

  I tried to add this code in ffplay.c , it didn’t work well enough, I can hear the transition. I guess seeking isn’t fast enough, or audio needs to be looped in an independant way somehow.

  static void video_refresh(void *opaque, double *remaining_time)
  
  {
  
     (original code here...)
  
      time = get_master_clock(is);
  
      if (isnan(time))
  
          time = (double)is->seek_pos / AV_TIME_BASE;
  
      if (time > jump_when) {
  
          stream_seek(is, (int64_t)(6.0 * AV_TIME_BASE), (int64_t)(0.0 * AV_TIME_BASE), 0);
  
      }
  
  }

  My current plan is to just dig into ffmpeg, understand how video and audio decoders work, and savestate/loadstate the decoders.