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• Convert *.OMG with FFMPEG

  26 janvier 2020, par Jimmy88

  I would like to convert my old Atrac Files that I recorded with my Sony MiniDisc (and copied to my PC with the Sony Software SonicStage.

  I tried with FFMPEG but it seems to fail.

  jim@my-mac ~/Downloads/asdf $ ffmpeg -i JAM.omg  -codec:a libmp3lame -qscale:a 0 Car myjam.mp3
  
  ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with Apple LLVM version 10.0.0 (clang-1000.10.43.1)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.0.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
  
    libavutil      56. 14.100 / 56. 14.100
  
    libavcodec     58. 18.100 / 58. 18.100
  
    libavformat    58. 12.100 / 58. 12.100
  
    libavdevice    58.  3.100 / 58.  3.100
  
    libavfilter     7. 16.100 /  7. 16.100
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  1.100 /  5.  1.100
  
    libswresample   3.  1.100 /  3.  1.100
  
    libpostproc    55.  1.100 / 55.  1.100
  
  [oma @ 0x7ff54c800e00] Format oma detected only with low score of 1, misdetection possible!
  
  [oma @ 0x7ff54c800e00] Couldn't find the EA3 header !
  
  JAM.omg: Invalid data found when processing input
  
  jim@my-mac ~/Downloads/asdf $

  There could be DRM on the file (which is a joke as I recorded myself with the MiniDisc and copied it over to the PC to archive it) but I heard the rumour that ffmpeg can crack the DRM.

  What could I do ?

• Add graphical annotations to a video e.g random drawings using flutter

  17 décembre 2019, par Tahir

  I have developed a flutter app in which i am using FFmpeg library for video manipulation ,
  Actually i want to draw some random drawings in to a video and make it a part of the video.
  what i am already doing is that , i added some annotated images into a video by using ffmpeg library in flutter , but the problem with ffmpeg is that it is very time consuming ,it is taking almost 10sec for a 10sec video clip.

  ffmpeg command i am using is :

  ffmpeg.execute("-y -i input.mp4" " -i input.png -filter_complex \"[0:v][1:v] overlay=(W-w)/2:(H-h)/2'\" -pix_fmt yuv420p -c:a copy output.mp4")

  I want to do it as fast as whatsapp annotations...
  any idea how to do that ?

• Rails 6 ActiveStorage re-encode videos

  14 novembre 2019, par gorgon

  Tried to use ActiveStorage::Previewer:VideoPreviewer to reencode original videos into smaller resolution and length, but it seems that it can only produce/extract image from video.

  Also tried to create a custom VideoPreviewer by using ffmpeg command to reencode videos, and rails seems to always favor the default ActiveStorage::Previewer::VideoPreviewer. Even if i kick out default video preview from rails previewer and put the custom one, rails still tried to use imagemagick and generates images

  class VideoPreviewer < ActiveStorage::Previewer
  
    ARGS = %w"ffmpeg args..."
  
  
  
    def self.accept?(blob)
  
      blob.content_type == 'video/mp4'
  
    end
  
  
  
    def preview
  
      download_blob_to_tempfile do |input|
  
        draw "ffmpeg", "-y", "-i", input.path, *ARGS do |output|
  
          yield io: output, filename: "#{blob.filename.base}.mp4", content_type: "video/mp4"
  
        end
  
      end
  
    end
  
  
  
    private
  
  
  
    def capture(*argv, to:)
  
      argv << to.path
  
      to.binmode
  
      IO.popen(argv) { |out| puts out.read }
  
      to.rewind
  
    end
  
  end

  Is there a way to achieve this with ActiveStorage or i need to go back using paperclip or some other gem ?