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• "Smooth" the ffmpeg showwaves video filter output

  24 décembre 2019, par goodytx

  I think I’m close to what I’m after, thanks to excellent answers like : FFMPEG : Fill/Change (part of) audio waveform color as per actual progress with respect to time progress ...but not quite there !

  I’m scripting the generation of a waveform video with showwaves, and overlaying that onto a static image background, turning the whole thing into video. All is well, except I’d like to "smooth" the waveform. In most tutorials/answers you will see jagged "peaks" in the waveform animation, as of course the audio data varies widely into peaks and troughs. (The differences expressed between the lowest and highest amplitude (I think) in each audio frame sample.) I’d like to get more of a consistent "flowing wave", without the sharp spikes up and down.

  Currently using the filter much as described in the previous link :

  [1:a]aformat=channel_layouts=mono,asplit[red][white]; \
  
  [red]showwaves=s=1280x100:rate=15:mode=cline:scale=sqrt:colors=0xff0000[red]; \

  Which results in the following (ignoring the red on white overlay, which I may drop) :

  Current v desired

  This generates the type of wave plot I want (solid vs a sine, for example), but I think I need to either tweak the audio stream or...possibly post filter the showwaves video stream (but I think the former) to get the effect I want. I tried to reduce the rate of showwaves but that just results in juddery video. So to me that feels like the audio data needs to be the changed factor.

  My limited audio knowledge leads me to think I should gain, compress, normalize, or all of the above, the audio input, which I have tried, but can’t seem to nail it. Keep in mind the audio stream in this filter chain is purely feeding the showwaves filter, so I can "trash" it as much as needed in order to get the visualization I want.

  I hope this all makes sense, and if I need to provide more info, please let me know. Thanks !

• FFMPEG : How to encode for seekable video at high key frame interval

  8 janvier 2024, par Johnny Slack

  I'm looking for an ffmpeg comand that's best used if I'm controlling a video to mouse control on "requestAnimationFrame". Basically, it needs to be fast-seeking and encoded at a high key frame interval. I can't seem to nail down what parameters aid in fast-seeking and high key frames.

  



  thanks !
Johnny

  


• ffmpeg stop the process after generating thumbnail

  5 octobre 2016, par arjun

  I have installed the ffmpeg in linux server for generating the video thumb nail
  installed ffmpeg using following commands

   sudo add-apt-repository ppa:mc3man/trusty-media
  
   sudo apt-get update
  
   sudo apt-get install ffmpeg

  installed in /usr/bin/ffmpeg location

  Here i am calling ffmpeg in my java code

   thumbnail videoThumbTaker = new thumbnail("/usr/bin/ffmpeg");
  
  
  
  videoThumbTaker.getThumb(uploadedFileLocation,  thumbnailimagepath,originalLocation, 900, 900, 0, 0, 1); 

  Thumbnail is successfully generated,the problem is after generating the thumbnail,ffmpeg process is continuously running,its not stoped.How can achive this !!