ffmprb

Gem Version Circle CI

your audio/video montage friend, based on ffmpeg

A DSL (Damn-Simple Language) and a micro-engine for ffmpeg and ffriends.

Allows for code like

av_raw = Ffmprb::File.open('flick.mp4')
a_track = Ffmprb::File.open('track.wav')
av_final = Ffmprb::File.create('cine.flv')
Ffmprb.process(av_raw, a_track, av_final) do |av_input1, a_input1, av_output1|

  in_main = input(av_input1)
  in_sound = input(a_input1, only: :audio)
  output(av_output1, resolution: Ffmprb::HD_720p) do
    roll in_main.cut(from: 2, to: 5).crop(0.25), transition: {blend: 1}
    roll in_main.cut(from: 6).volume(2), after: 2, transition: {blend: 1}
    cut after: 10, transition: {blend: 1}
    overlay in_sound.volume(0.8), duck: :audio
  end

end

and saves you from the horrors of (the native ffmpeg equivalent)

ffmpeg -y -i flick.mp4 -i track.wav -filter_complex "[0:v] copy [tmcpsp0:v]; [0:a] anull [tmcpsp0:a]; [tmcpsp0:v] trim=2:5, setpts=PTS-STARTPTS [cpsp0:v]; [tmcpsp0:a] atrim=2:5, asetpts=PTS-STARTPTS [cpsp0:a]; [cpsp0:v] crop=x=in_w*0.25:y=in_h*0.25:w=in_w*0.5:h=in_h*0.5 [sp0:v]; [cpsp0:a] anull [sp0:a]; [sp0:v] scale=iw*min(1280/iw\,720/ih):ih*min(1280/iw\,720/ih), pad=1280:720:(1280-iw*min(1280/iw\,720/ih))/2:(720-ih*min(1280/iw\,720/ih))/2, fps=fps=30 [rl0:v]; [sp0:a] anull [rl0:a]; color=black:d=1.0:s=1280x720:r=30 [bl0:v]; aevalsrc=0:d=1.0 [bl0:a]; [bl0:v] trim=0:1.0, setpts=PTS-STARTPTS [tm0b:v]; [bl0:a] atrim=0:1.0, asetpts=PTS-STARTPTS [tm0b:a]; color=white:d=1.0:s=1280x720:r=30 [rn70152323222540:v]; [tm0b:v] [rn70152323222540:v] alphamerge, fade=out:d=1.0:alpha=1 [xrn70152323222540:v]; [rl0:v] [xrn70152323222540:v] overlay=x=0:y=0:eof_action=pass [tn0:v]; [tm0b:a] afade=out:d=1.0 [rn70152323222540:a]; [rl0:a] afade=in:d=1.0 [xrn70152323222540:a]; [xrn70152323222540:a] [rn70152323222540:a] amix=2:duration=first [tn0:a]; [0:v] copy [tmldsp1:v]; [0:a] anull [tmldsp1:a]; [tmldsp1:v] trim=6, setpts=PTS-STARTPTS [ldsp1:v]; [tmldsp1:a] atrim=6, asetpts=PTS-STARTPTS [ldsp1:a]; [ldsp1:v] copy [sp1:v]; [ldsp1:a] volume='2':eval=frame [sp1:a]; [sp1:v] scale=iw*min(1280/iw\,720/ih):ih*min(1280/iw\,720/ih), pad=1280:720:(1280-iw*min(1280/iw\,720/ih))/2:(720-ih*min(1280/iw\,720/ih))/2, fps=fps=30 [rl1:v]; [sp1:a] anull [rl1:a]; color=black:d=3.0:s=1280x720:r=30 [bltn01:v]; aevalsrc=0:d=3.0 [bltn01:a]; [tn0:v] [bltn01:v] concat=2:v=1:a=0 [pdtn01:v]; [tn0:a] [bltn01:a] concat=2:v=0:a=1 [pdtn01:a]; [pdtn01:v] split [pdtn01a:v] [pdtn01b:v]; [pdtn01:a] asplit [pdtn01a:a] [pdtn01b:a]; [pdtn01a:v] trim=0:2, setpts=PTS-STARTPTS [tmtn01a:v]; [pdtn01a:a] atrim=0:2, asetpts=PTS-STARTPTS [tmtn01a:a]; [pdtn01b:v] trim=2:3.0, setpts=PTS-STARTPTS [tm1b:v]; [pdtn01b:a] atrim=2:3.0, asetpts=PTS-STARTPTS [tm1b:a]; color=white:d=1.0:s=1280x720:r=30 [rn70152323237760:v]; [tm1b:v] [rn70152323237760:v] alphamerge, fade=out:d=1.0:alpha=1 [xrn70152323237760:v]; [rl1:v] [xrn70152323237760:v] overlay=x=0:y=0:eof_action=pass [tn1:v]; [tm1b:a] afade=out:d=1.0 [rn70152323237760:a]; [rl1:a] afade=in:d=1.0 [xrn70152323237760:a]; [xrn70152323237760:a] [rn70152323237760:a] amix=2:duration=first [tn1:a]; color=black:d=11.0:s=1280x720:r=30 [bltn12:v]; aevalsrc=0:d=11.0 [bltn12:a]; [tn1:v] [bltn12:v] concat=2:v=1:a=0 [pdtn12:v]; [tn1:a] [bltn12:a] concat=2:v=0:a=1 [pdtn12:a]; [pdtn12:v] split [pdtn12a:v] [pdtn12b:v]; [pdtn12:a] asplit [pdtn12a:a] [pdtn12b:a]; [pdtn12a:v] trim=0:10, setpts=PTS-STARTPTS [tmtn12a:v]; [pdtn12a:a] atrim=0:10, asetpts=PTS-STARTPTS [tmtn12a:a]; color=black:d=1.0:s=1280x720:r=30 [bk2:v]; aevalsrc=0:d=1.0 [bk2:a]; [pdtn12b:v] trim=10:11.0, setpts=PTS-STARTPTS [tm2b:v]; [pdtn12b:a] atrim=10:11.0, asetpts=PTS-STARTPTS [tm2b:a]; color=white:d=1.0:s=1280x720:r=30 [rn70152323255640:v]; [tm2b:v] [rn70152323255640:v] alphamerge, fade=out:d=1.0:alpha=1 [xrn70152323255640:v]; [bk2:v] [xrn70152323255640:v] overlay=x=0:y=0:eof_action=pass [tn2:v]; [tm2b:a] afade=out:d=1.0 [rn70152323255640:a]; [bk2:a] afade=in:d=1.0 [xrn70152323255640:a]; [xrn70152323255640:a] [rn70152323255640:a] amix=2:duration=first [tn2:a]; [tmtn01a:v] [tmtn12a:v] [tn2:v] concat=3:v=1:a=0 [oo:v]; [tmtn01a:a] [tmtn12a:a] [tn2:a] concat=3:v=0:a=1 [oo:a]; [1:a] anull [ldol0:a]; [ldol0:a] volume='0.8':eval=frame [ol0:a]" -map "[oo:v]" -map "[oo:a]" /tmp/inter1a.flv -map "[ol0:a]" /tmp/inter1b.wav

ffmpeg -y -i /tmp/inter1a.flv -filter_complex "silencedetect=d=2:n=-30dB" /tmp/inter2.flv

ffmpeg -y -i /tmp/inter2.flv -i /tmp/inter1b.wav -filter_complex "[0:v] copy [sp0:v]; [0:a] anull [sp0:a]; [sp0:v] scale=iw*min(1280/iw\,720/ih):ih*min(1280/iw\,720/ih), pad=1280:720:(1280-iw*min(1280/iw\,720/ih))/2:(720-ih*min(1280/iw\,720/ih))/2, fps=fps=30 [rl0:v]; [sp0:a] anull [rl0:a]; [rl0:v] concat=1:v=1:a=0 [oo:v]; [rl0:a] concat=1:v=0:a=1 [oo:a]; [1:a] anull [ldol0:a]; [ldol0:a] volume='if(between(t, 9.5, 10.5), (-0.8*t + 8.500000000000002)/1.0, if(between(t, 0.5, 9.5), 0.9, if(between(t, -0.5, 0.5), (0.8*t + 0.5)/1.0, if(between(t, 0.0, -0.5), 0.1, if(between(t, 0.0, 0.0), 0.1, 0.1)))))':eval=frame [ol0:a]; [oo:v] copy [oo0:v]; [oo:a] [ol0:a] amix=2:duration=first [oo0:a]" -map "[oo0:v]" -map "[oo0:a]" cine.flv

Umm... That's the idea.

The docs, as well as any other part of this gem, are totally a work in progress. So you're very welcome to look around the specs for the current functionality coverage, or in the gem's "main" for useful constants and configuration options.

Installation

Add this line to your application's Gemfile:

gem 'ffmprb'

And then execute:

$ bundle

Or install it yourself as:

$ gem install ffmprb

DSL & Usage

TODO: Write usage instructions here

Development

After checking out the repo, run bin/setup to install dependencies. Then, run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release to create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

  1. Fork it ( https://github.com/showbox-oss/ffmprb/fork )
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create a new Pull Request