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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

• Combine Two Commands (Get Video from Images)

  18 mai 2019, par user2401847

  I have 300 images and i wants to generate video from these images.
  i am new to FFMPEG so now i am using two commands to generate video from images.
  Command to generate video from images which also add Logo on video

  ffmpeg -framerate 24 -i img_%d.jpg -i logo.png -filter_complex \
  
  "[0:v][1:v] overlay=25:25:enable='between(t,0,20)'" \
  
  -vcodec libx264 -crf 25  -pix_fmt yuv420p  test_video.mp4

  After using above command i am getting the video to add audio to this video i am using below command

  ffmpeg -i test_video.mp4 -i inputfile.mp3 -c:v libx264 -c:a libvorbis -shortest final_video.mp4

  which generates video and i am getting below message

  MPEG-4 AAC decoder is required to play the file

  Help to combine this both command. if possible can we add sound without any decoder required

  Log for command 1 https://drive.google.com/file/d/1zS7gvrPy69VK_MkyE4127FpX2kEziJHq/view?usp=sharing

  and Log command 2 https://drive.google.com/file/d/1rHqVGzj7f003aWP6eISiyUjsES8_EWuw/view?usp=sharing

• Icecast live stream extract none silent parts into individual files

  18 avril 2020, par Nokoa

  I am looking to split an icecast audio live stream into individual audio files separated by silences. I was able to achieve this with FFMPEG when having the source input file saved locally first. I can't do that because I have 20 streams being monitored and the original files keeps growing and end up taking too much space on my drive.

  



  Is it possible to do this directly with a live stream audio without saving the full original uncut stream file to drive ?