Release a new version, update the version number in version. To install this gem onto your local machine, run bundle exec rake install. Prompt that will allow you to experiment. Im trying to achieve complex effect with ffmpeg, but I seem to be failing the syntax of -filtercomplex somewhere. You can also run bin/console for an interactive def mono_mix ) ] end end DevelopmentĪfter checking out the repo, run bin/setup to install dependencies. ![]() to_s, '-map', SoundtrackVideo, '-map', SoundtrackAudio, '-map', "", ) end private def create_filter_graph graph ( outputs: 'CommentaryTrack', chains:, filters: a_split ( number: 3 ), outputs: %w( RLcom RRcom Ducker ) ), # Auto-duck the soundtrack, so we can hear the commentary chain ( inputs:, filters:, outputs: surround_channels ( DuckedSoundtrack ), ), # Merge commentary into rear channels chain ( inputs: surround_channels ( DuckedSoundtrack, :rl ) << 'RLcom', filters: mono_mix, outputs: %w( RLmix ) ), chain ( inputs: surround_channels ( DuckedSoundtrack, :rr ) << 'RRcom', filters: mono_mix, outputs: %w( RRmix ) ), chain ( inputs: surround_channels ( DuckedSoundtrack, :fl, :fr, :fc, :lfe ) + %w( RLmix RRmix ), filters: ), ] ) end # You can easily encapsulate a group of filters with private methods, for # better readability. class AddCommentary include FFmpeg:: Filters:: Helper # Surround-sound prefixes Soundtrack = 'c' DuckedSoundtrack = 'r' # ffmpeg notation SoundtrackVideo = '1:v' SoundtrackAudio = '1:a' CommentaryAudio = '2:a' def initialize ( media_container_path, commentary_audio_path, output_path ) = media_container_path = commentary_audio_path = output_path end def call filter_graph = create_filter_graph spawn ( 'ffmpeg', '-i', , '-i', , '-filter_complex', filter_graph. To make the commentary more audible, with "duck" the soundtrack # before mixing in the commentary. ![]() The # new audio stream will contain a copy of the film's soundtrack, with the # commentary track mixed into the rear speakers (for a nice Statler and Waldorf # experience). ![]() ![]() srt -vcodec h264 -acodec ac3 -scodec srt -metadata:s:s:0 languageita output2.mkv Rendering Subtitles into the Video Edit Subtitles may be rendered permanently into the video stream by specifying a complex filter on the command line. # This class adds an additional audio stream to a given multimedia file. ffmpeg -i input.avi -subcharenc ISO-8859-1 -i subtitle.
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