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• FFMPEG, how to create custom waveform

  9 juin 2017, par Bodie Leonard

  I have done research trying to create a waveform with FFMPEG and am currently able to create a white png with the wave being transparent. The goal is to generate the wave like the smooth wave below and have the grey be transparent.
  

  Here is my current FFMPEG waveform generator and output.

  ffmpeg -i ./_test.mp3 -filter_complex \
  
  "[0:a]aformat=channel_layouts=mono,compand=gain=-6, \
  
  showwavespic=s=450x46:colors=white,negate[a]; \
  
  color=white:450x46[c]; \
  
  [c][a]alphamerge"  -vframes 1 _test.png

  

• How do I avoid batch video transcoding error when encountering whitespaces in filename using ffmpeg [duplicate]

  20 février 2019, par russell newton

  This question already has an answer here :

  • Looping through find output in Bash where file name contains white spaces
    
    2 answers
    

  I am running a bash script to batch transcode videos on a LAMP server using find and ffmpeg

  dir="/srv/videos"
  
  for OUTPUT in "$(find $dir -iname *.AVI -o -iname *.MOV)"
  
  do
  
      ffmpeg -i "$OUTPUT" "${OUTPUT%%.*}.mp4"  -hide_banner
  
  done

  ffmpeg returns an error if file has whitespaces

   /srv/videos/file with white spaces.MOV: No such file or directory

  For files without white spaces it works fine.
  If I print the filenames inside quotes it looks as though it should be working

  for OUTPUT in "$(find $dir -iname *.MOV)"; do echo "$OUTPUT";done

  returns

  /srv/videos/file with white spaces.MOV

  What do I need to alter to avoid the error please ?

  EDIT
  added "" to $OUTPUT%%.*.mp4, I get the same error and corrected extension capitalisation (mov to MOV)

• Replacing detected object in a frame with an image.(imageProcessing)

  29 juin 2015, par Kiran Kumar Dash

  Overview :

  I am working on a video creation project. The technology I am using are : imageMagick, php, ffmpeg.

  Current Status :

  Currently the project is able to create videos using images and texts and few basic transitions. The way I am doing it is using imagemagick to create gif using input images(with transition effects in them) and then converting all gifs to videos and atlast concatenating the video together.

  Next Move (My question) :

  I am now set to take it to the next level. So, what I am having is a video(1920x1080) with some white frames(1280x720) that keeps shifting in each frame. I want to replace those white frames appearing in some frames of the video with some images(1280x720) that I wish to use. Please see the image here and you will get an idea : These are just two frames from my video. If you can see carefully the images are shifting(white space is not constant).

  

  

  Expectation :

  So, I want to fill those white space with one of my own image. If the case would have been for only one frame I could have used ffmpeg to overlay image on the exact width and height. But here the white space is not fixed and keeps shifting in all the frames and there are a lot of frames. So, I am looking for something like opencv or some other technology that can be used for object detection in a video or in a set of frames and replace the detected area with some other image.

  I just need a kick. So, if anyone has already worked on something like this just suggest me what technology can I use. Thanks in advance.