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• What options I should use to rescale video without skewing them in FFMPEG Rails ?

  5 juin 2019, par ADMAT Bandara

  The main issue happens when it processes the recalling

  All videos uploading from Apple iOS will process nicely.
  But all videos uploading from Android devices are getting skewed.

  In my rails app, I am using Carrierwave:Video and FFMPEG to process videos with the help of delayed jobs.

  class VideoUploader < CarrierWave::Uploader::Base
  
  
  
    include CarrierWave::Video
  
    include CarrierWave::Video::Thumbnailer
  
  
  
    # For carrierwave_backgrounder
  
    include ::CarrierWave::Backgrounder::Delay
  
  
  
    version :rescaled do
  
      process encode_video: [
  
        :mp4,
  
        resolution: "640x480", # Aspect ratio is preserved automatically
  
        audio_codec: "aac",
  
        custom: "-strict experimental -q:v 0 -preset slow -g 30",
  
        callbacks: { after_transcode: :set_success }
  
      ]
  
    end
  
  
  
  
  
    version :thumb do
  
      process thumbnail: [{format: 'png', quality: 10, size: 400, strip: true, logger: Rails.logger}]
  
      def full_filename for_file
  
        png_name for_file, version_name
  
      end
  
    end

  This is correct videos screenshot

  https://drive.google.com/open?id=1D0aNWcVxtL6DbTwBmWWIGzUUuyEyWNOG

  This the video screenshot after video process with FFMPEG

  https://drive.google.com/open?id=1vilExHoan2UuRPH9RbiZig58H1TwyewA

  (It’s like vertically pressed)

  ---

  Please help me, if you know a solution

• Revision 6522 : $GLOBALS[’liste_des_forums’] a disparu

  12 juin 2012, par kent1 — Log

  $GLOBALSliste_des_forums ? a disparu

• ffmpeg generate overlay complex filter for audio with background image

  8 janvier 2016, par user1793606

  I am experimenting with ffmpeg and would like to generate overlay complex filter for audio with background image. The code normally works, except for when adding -filter_complex "[0:a]showwaves=s=1280x720:mode=line,format=yuv420p[v]" -map "[v]" -map 0:a
  it crashes. I found the example code at https://trac.ffmpeg.org/wiki/Waveform Any help is appreciated.

  Command '['c:/ffmpeg/bin\\ffmpeg.exe', '-y', '-loop', '1', '-r', '1', '-i', 'temp\\bg.png', '-i', 'test.mp3', '-filter_complex', '[0:a]showwaves=s=1280x720:mode=line,format=yuv420p[v]', '-map', '[v]', '-map', '0:a', '-c:v', 'libx264', '-preset', 'ultrafast', '-tune', 'stillimage', '-crf', '15', '-pix_fmt', 'yuv420p', '-strict', 'experimental', '-c:a', 'aac', '-b:a', '256k', '-shortest', '-threads', '0', 'done/test.mp4']'

  EDIT 1 :

  I tested this with the new verson : ffmpeg -y -i input.mp3 -i background.png -filter_complex "[0:a]showwaves=s=1280x720:mode=line,format=yuv420p[v]" -map "[v]" -map 0:a -c:v libx264 -c:a copy output.mp4

  It generates an output file, but only the waveform, no background included. My end goal is to generate the waveform over the background.