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• FFmpeg take screenshots from videos with variable duration

  9 mai 2015, par Igor Loskutov

  I have bunch of videos which are rather long, so I take screenshots of 10th second (-ss 00:00:10). Sometimes videos are very short, like 5 seconds, and -ss 00:00:10 fails.

  I don’t have an option to compute video size as don’t have an option to download them whole (videos are hosted on S3 and used as streams through CloudFront).

  Maybe there are some built-in options that I overlooked ?

  What I really don’t want to do is shorten -ss option gradually on fails so it would be the last resort.

• getting correpted video when merging two videos from ffmpeg

  18 mai 2015, par Kamal Banoudhia

  I am Merging two video fies from ffmpeg but t successfully play the first one video but corrupted the second one.
  Please help me in php and also from command line.
  Please suggest if another effective way is their.

  Thanks,
  Kamal Banoudhia

• remove space from the path of the videos to be converted by ffmpeg on rails 3

  8 janvier 2014, par Mike

  i am using ffmpeg to convert videos uploaded by the user on rails 3 windows platform.Now when i use ffmpeg -i C:\three.wmv -vcodec h264  C:\threeeeee.mp4 i get the converted video ready to play,but when i use the default path from paperclip such as

    has_attached_file :source,
  
      :max_size => 300.megabytes,
  
     :url  => "/assets/uploads/:id/:style/:basename.:extension",
  
     :path => ":rails_root/public/assets/uploads/:id/:style/:basename.:extension",
  
     :processors => [:ffmpeg]

  i get error as No such file or directory because the project is in the folder as

  c:new projects/new/app..and so  on 

  .its because of the space between the folder name new project...
  so how to avoid it.i know its a kind of weird behavior but i need the reason because changing just the folder name doesnt make any sense to me.

  my video.rb

    has_attached_file :source,
  
      :max_size => 300.megabytes,
  
         :url  => "/assets/uploads/:id/:style/:basename.:extension",
  
         :path => ":rails_root/public/assets/uploads/:id/:style/:basename.:extension",
  
     :processors => [:ffmpeg]
  
  
  
  after_create :convert_in_flv, :set_new_filename
  
  
  
  
  
  def convert_in_flv
  
  
  
    system("ffmpeg -i #{Rails.root}/public/assets/uploads/#{self.id}/original/#{self.source_file_name} -vcodec h264 #{Rails.root}/public/assets/uploads/#{self.id}/original/#{self.id}.mp4")
  
    ###system("ffmpeg -i #{source.path} -vcodec libx264 -vpre ipod640 -b 250k -bt 50k -acodec libfaac -ab 56k -ac 2 -s 480x320 #{flv}")
  
  
  
  end
  
  
  
  
  
    ##ffmpeg -i C:\three.wmv -vcodec h264  C:\threeeeee.mp4....this works
  
  
  
  
  
  def set_new_filename
  
  
  
    update_attribute(:source_file_name, "#{id}.flv")
  
  end