Module: Ffmprb::Filter

Defined in:
lib/ffmprb/filter.rb

Defined Under Namespace

Classes: Error

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.silence_noise_max_db ⇒ Object

Returns the value of attribute silence_noise_max_db.



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# File 'lib/ffmprb/filter.rb', line 9

def silence_noise_max_db
  @silence_noise_max_db
end

Class Method Details

.afade_in(duration, input = nil, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 15

def afade_in(duration, input=nil, output=nil)
  inout "afade=in:d=%{duration}:curve=hsin", input, output, duration: duration
end

.afade_out(duration, input = nil, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 19

def afade_out(duration, input=nil, output=nil)
  inout "afade=out:d=%{duration}:curve=hsin", input, output, duration: duration
end

.alphamerge(inputs, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 11

def alphamerge(inputs, output=nil)
  inout "alphamerge", inputs, output
end

.amix_to_first_same_volume(inputs, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 23

def amix_to_first_same_volume(inputs, output=nil)
  filters = []
  new_inputs = inputs.map do |input|
    if input == inputs.first
      input
    else
      "apd#{input}".tap do |lbl_aux|
        filters +=
          inout("apad", input, lbl_aux)  # NOTE we'll see if we really need this filter separate
      end
    end
  end
  filters +
    inout("amix=%{inputs_count}:duration=shortest:dropout_transition=0, volume=%{inputs_count}",
      new_inputs, output, inputs_count: (inputs.empty?? nil : inputs.size))
end

.anull(input = nil, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 40

def anull(input=nil, output=nil)
  inout "anull", input, output
end

.anullsink(input = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 44

def anullsink(input=nil)
  inout "anullsink", input, nil
end

.asplit(inputs = nil, outputs = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 48

def asplit(inputs=nil, outputs=nil)
  inout "asplit", inputs, outputs
end

.atrim(st, en = nil, input = nil, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 52

def atrim(st, en=nil, input=nil, output=nil)
  inout "atrim=%{start_end}, asetpts=PTS-STARTPTS", input, output,
    start_end: [st, en].compact.join(':')
end

.blank_source(duration, resolution, fps, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 57

def blank_source(duration, resolution, fps, output=nil)
  color_source '0x000000@0', duration, resolution, fps, output
end

.blend_a(duration, inputs, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 214

def blend_a(duration, inputs, output=nil)
  fail Error, "must be given 2 inputs"  unless inputs.size == 2

  aux_lbl = "blnd#{inputs[0]}"
  auxx_lbl = "x#{aux_lbl}"
  [
    *afade_out(duration, inputs[0], aux_lbl),
    *afade_in(duration, inputs[1], auxx_lbl),
    *amix_to_first_same_volume([auxx_lbl, aux_lbl], output)
  ]
end

.blend_v(duration, resolution, fps, inputs, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 199

def blend_v(duration, resolution, fps, inputs, output=nil)
  fail Error, "must be given 2 inputs"  unless inputs.size == 2

  aux_lbl = "blnd#{inputs[0]}"
  auxx_lbl = "x#{aux_lbl}"
  [
    *white_source(duration, resolution, fps, aux_lbl),
    *inout([
      *alphamerge([inputs[0], aux_lbl]),
      *fade_out_alpha(duration)
    ].join(', '), nil, auxx_lbl),
    *overlay(0, 0, [inputs[1], auxx_lbl], output),
  ]
end

.color_source(color, duration, resolution, fps, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 61

def color_source(color, duration, resolution, fps, output=nil)
  inout "color=%{color}:d=%{duration}:s=%{resolution}:r=%{fps}", nil, output,
    color: color, duration: duration, resolution: resolution, fps: fps
end

.complex_args(*filters) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 264

def complex_args(*filters)
  [].tap do |args|
    args << '-filter_complex' << filters.join('; ') unless
      filters.empty?
  end
end

.concat_a(inputs, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 79

def concat_a(inputs, output=nil)
  return anull(inputs, output)  if inputs.size == 1
  inout "concat=#{inputs.size}:v=0:a=1", inputs, output
end

.concat_av(inputs, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 84

def concat_av(inputs, output=nil)
  fail Error, "must be given an even number of inputs"  unless inputs.size.even?
  inout "concat=#{inputs.size/2}:v=1:a=1", inputs, output
end

.concat_v(inputs, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 74

def concat_v(inputs, output=nil)
  return copy(inputs, output)  if inputs.size == 1
  inout "concat=#{inputs.size}:v=1:a=0", inputs, output
end

.copy(input = nil, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 89

def copy(input=nil, output=nil)
  inout "copy", input, output
end

.crop(crop, input = nil, output = nil) ⇒ Object

TODO unused at the moment



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# File 'lib/ffmprb/filter.rb', line 94

def crop(crop, input=nil, output=nil)
  inout "crop=x=%{left}:y=%{top}:w=%{width}:h=%{height}", input, output, crop
end

.crop_prop(crop, input = nil, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 98

def crop_prop(crop, input=nil, output=nil)
  inout "crop=%{crop_exp}", input, output,
    crop_exp: crop_prop_exps(crop).join(':')
end

.crop_prop_exps(crop) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 103

def crop_prop_exps(crop)
  exps = []

  if crop[:left]
    exps << "x=in_w*#{crop[:left]}"
  end

  if crop[:top]
    exps << "y=in_h*#{crop[:top]}"
  end

  if crop[:right] && crop[:left]
    fail Error, "Must specify two of {left, right, width} at most"  if crop[:width]
    crop[:width] = 1 - crop[:right] - crop[:left]
  elsif crop[:width]
    if !crop[:left] && crop[:right]
      crop[:left] = 1 - crop[:width] - crop[:right]
      exps << "x=in_w*#{crop[:left]}"
    end
  end
  exps << "w=in_w*#{crop[:width]}"

  if crop[:bottom] && crop[:top]
    fail Error, "Must specify two of {top, bottom, height} at most"  if crop[:height]
    crop[:height] = 1 - crop[:bottom] - crop[:top]
  elsif crop[:height]
    if !crop[:top] && crop[:bottom]
      crop[:top] = 1 - crop[:height] - crop[:bottom]
      exps << "y=in_h*#{crop[:top]}"
    end
  end
  exps << "h=in_h*#{crop[:height]}"

  exps
end

.fade_out_alpha(duration, input = nil, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 66

def fade_out_alpha(duration, input=nil, output=nil)
  inout "fade=out:d=%{duration}:alpha=1", input, output, duration: duration
end

.fps(fps, input = nil, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 70

def fps(fps, input=nil, output=nil)
  inout "fps=fps=%{fps}", input, output, fps: fps
end

.nullsink(input = nil) ⇒ Object

NOTE might be very useful with UGC: def cropdetect



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# File 'lib/ffmprb/filter.rb', line 141

def nullsink(input=nil)
  inout "nullsink", input, nil
end

.overlay(x = 0, y = 0, inputs = nil, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 145

def overlay(x=0, y=0, inputs=nil, output=nil)
  inout "overlay=x=%{x}:y=%{y}:eof_action=pass", inputs, output, x: x, y: y
end

.pad(resolution, input = nil, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 149

def pad(resolution, input=nil, output=nil)
  width, height = resolution.to_s.split('x')
  inout [
    inout("pad=%{width}:%{height}:(%{width}-iw*min(%{width}/iw\\,%{height}/ih))/2:(%{height}-ih*min(%{width}/iw\\,%{height}/ih))/2",
      width: width, height: height),
    *setsar(1)  # NOTE the scale & pad formulae damage SAR a little, unfortunately
  ].join(', '), input, output
end

.scale(resolution, input = nil, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 162

def scale(resolution, input=nil, output=nil)
  width, height = resolution.to_s.split('x')
  inout [
    inout("scale=iw*min(%{width}/iw\\,%{height}/ih):ih*min(%{width}/iw\\,%{height}/ih)", width: width, height: height),
    *setsar(1)  # NOTE the scale & pad formulae damage SAR a little, unfortunately
  ].join(', '), input, output
end

.scale_pad(resolution, input = nil, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 170

def scale_pad(resolution, input=nil, output=nil)
  inout [
    *scale(resolution),
    *pad(resolution)
  ].join(', '), input, output
end

.scale_pad_fps(resolution, _fps, input = nil, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 177

def scale_pad_fps(resolution, _fps, input=nil, output=nil)
  inout [
    *scale_pad(resolution),
    *fps(_fps)
  ].join(', '), input, output
end

.setsar(ratio, input = nil, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 158

def setsar(ratio, input=nil, output=nil)
  inout "setsar=%{ratio}", input, output, ratio: ratio
end

.silencedetect(input = nil, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 184

def silencedetect(input=nil, output=nil)
  inout "silencedetect=d=1:n=%{silence_noise_max_db}dB", input, output,
    silence_noise_max_db: silence_noise_max_db
end

.silent_source(duration, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 189

def silent_source(duration, output=nil)
  inout "aevalsrc=0:d=%{duration}", nil, output, duration: duration
end

.split(inputs = nil, outputs = nil) ⇒ Object

NOTE might be very useful with transitions: def smartblur



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# File 'lib/ffmprb/filter.rb', line 195

def split(inputs=nil, outputs=nil)
  inout "split", inputs, outputs
end

.trim(st, en = nil, input = nil, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 226

def trim(st, en=nil, input=nil, output=nil)
  inout "trim=%{start_end}, setpts=PTS-STARTPTS", input, output,
    start_end: [st, en].compact.join(':')
end

.volume(volume, input = nil, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 231

def volume(volume, input=nil, output=nil)
  inout "volume='%{volume_exp}':eval=frame", input, output,
    volume_exp: volume_exp(volume)
end

.volume_exp(volume) ⇒ Object

NOTE supposedly volume list is sorted



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# File 'lib/ffmprb/filter.rb', line 237

def volume_exp(volume)
  return volume  unless volume.is_a?(Hash)

  fail Error, "volume cannot be empty"  if volume.empty?

  prev_at = 0.0
  prev_vol = volume[prev_at] || 1.0
  exp = "#{volume[volume.keys.last]}"
  volume.each do |at, vol|
    next if at == 0.0
    vol_exp =
      if (vol - prev_vol).abs < 0.001
        vol
      else
        "(#{vol - prev_vol}*t + #{prev_vol*at - vol*prev_at})/#{at - prev_at}"
      end
    exp = "if(between(t, #{prev_at}, #{at}), #{vol_exp}, #{exp})"
    prev_at = at
    prev_vol = vol
  end
  exp
end

.white_source(duration, resolution, fps, output = nil) ⇒ Object 



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# File 'lib/ffmprb/filter.rb', line 260

def white_source(duration, resolution, fps, output=nil)
  color_source '0xFFFFFF@1', duration, resolution, fps, output
end