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• ffmpeg split video H264 stutters on Windows Media Player

  9 mars 2019, par Juan Foegen

  I am converting and splitting wmv and mp4 into new mp4 files. I am using ffmpeg to do the conversion with simply :
  ffmpeg -i inputfile.wmv -vcodec libx264 -ss 00:00:10 -t 00:00:15 outputfile.mp4

  So when I create my split video it plays fine on other video players, like VLC, but stutters when initially playing on Windows Media Player and even shows a blank screen for a moment and then after about 5 seconds, the video will play normally. If I then select play again without reloading, Windows Media Player will play the video fine, with no stuttering.

  If I REMOVE the start parameter when doing the conversion, then the resulting video will play without issues on all my players, INCLUDING Windows Media Player.

  I have tried changing the frame rate, the bit rate and altered different optimization options mentioned here - https://trac.ffmpeg.org/wiki/Encode/H.264

  I need the split video to play on Windows machines on Windows Media Player and on the web streamed using the video element. This is why I chose H264 codec and MP4.

  Has anyone had issues playing ffmpeg split videos using H264 codec with Windows Media Player ? I am using the latest version of ffmpeg. Anyone have any other suggestions on any different settings I could try to adjust ?

  Thanks

• PyCharm terminal not detecting ffmpeg even after succesful installtion on Windows

  26 avril 2020, par Mandar

  I am working on Windows 10 and PyCharm 2019.2.6 Community Edition. I have followed all the steps for installing FFmpeg on windows. I'm currently working on a project in PyCharm. When I enter ffmpeg -h in command prompt, it works fine. However, when I enter the same command in PyCharm's terminal, it shows 'ffmpeg' is not recognized as an internal or external command,
operable program or batch file. I have added ffmpeg/bin to path as well.

  


• Sidekiq not processing video meta data using stremio-ffmpeg in rails app

  22 juillet 2017, par Arnold

  I am trying to process different video resolutions in background using carrierwave backgrounder, carrierwave-video and sidekiq. everything is working well (all the versions are created in background) except the meta data captured using stremio-ffmpeg. I am completely stuck and can’t figure out why the meta data are not being processed.

  below are my sample codes

  video_uploader.rb

  require 'streamio-ffmpeg'
  
  class VideoUploader < CarrierWave::Uploader::Base
  
  include CarrierWave::Video  # for your video processing
  
  include CarrierWave::Video::Thumbnailer
  
  include ::CarrierWave::Backgrounder::Delay
  
  # Include RMagick or MiniMagick support:
  
  # include CarrierWave::RMagick
  
  # include CarrierWave::MiniMagick
  
  # Choose what kind of storage to use for this uploader:
  
  storage :file
  
  # storage :fog
  
  #byebug
  
  process :save_metadata
  
  # Override the directory where uploaded files will be stored.
  
  # This is a sensible default for uploaders that are meant to be mounted:
  
  def store_dir
  
  default_path = "/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  
  # if FLAVOR == "uglive"
  
  #   default_path = "/uglive#{default_path}"
  
  # end
  
  "#{VIDEO_STORAGE}#{default_path}"
  
  end
  
  version :thumb do
  
  process thumbnail: [{format: 'png', quality: 10, size: 360, strip: false, 
  
  square: false, logger: Rails.logger}]
  
  def full_filename for_file
  
    png_name for_file, version_name
  
  end
  
  end
  
  def png_name for_file, version_name
  
  #remove all accents
  
  I18n.transliterate(%Q{#{version_name}_#
  
  {for_file.chomp(File.extname(for_file))}.png})
  
  end
  
  #save the video size in the model
  
  def save_metadata
  
  video = FFMPEG::Movie.new(file.file)
  
  if video.valid?
  
    model.duration = video.duration #(duration of the video in seconds)
  
    model.size = video.size #size is bytes
  
    model.video_codec = video.video_codec # "h264"
  
    model.width = video.width # 640 (width of the video in pixels)
  
    model.height = video.height # 480 (height of the video in pixels)
  
    model.audio_codec = video.audio_codec # "aac"
  
   end
  
   end
  
   # Different Video Resolutions
  
   version :res_480p, :do_not_delay => true do
  
   process encode_video: [:mp4, resolution: "720X480"]
  
   end
  
   version :res_720p do
  
   process encode_video: [:mp4, resolution: "1280X720"]
  
  end
  
  version :res_360p do
  
  process encode_video: [:mp4, resolution: "640x360"]
  
  end
  
  version :res_240p do
  
  process encode_video: [:mp4, resolution: "426x240"]
  
  end

  video.rb i called the mount uploader and background_process method (carrierwave video gem)

  mount_uploader :file, VideoUploader
  
  process_in_background :file

  when i run bundle exec sidekiq -q carrierwavethe version are created in background but the save_metadata method is never processed, so the duration,size,width, height, video_codec and audio_codec are nil in the Video model.

  I am stuck on this the whole day. any help will be highly welcome