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.



9
10
11
 
# 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 



15
16
17
 
# 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 



19
20
21
 
# 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 



11
12
13
 
# 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 



23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
 
# 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 



40
41
42
 
# File 'lib/ffmprb/filter.rb', line 40

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

.anullsink(input = nil) ⇒ Object 



44
45
46
 
# File 'lib/ffmprb/filter.rb', line 44

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

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



52
53
54
 
# File 'lib/ffmprb/filter.rb', line 52

def areverse(input=nil, output=nil)
  inout 'areverse', input, output
end

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



48
49
50
 
# File 'lib/ffmprb/filter.rb', line 48

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

.atempo(tempo, input = nil, output = nil) ⇒ Object 



56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
 
# File 'lib/ffmprb/filter.rb', line 56

def atempo(tempo, input=nil, output=nil)
  fail Error, "Push the tempo!"  unless
    tempo > 0

  fil = ''
  tmp = tempo
  while tmp > 2.0
    fil += 'atempo=2.0, '
    tmp /= 2.0
  end
  while tmp < 0.5
    fil += 'atempo=0.5, '
    tmp /= 0.5
  end
  inout "#{fil}atempo=#{tmp.to_f}", input, output
end

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



73
74
75
76
 
# File 'lib/ffmprb/filter.rb', line 73

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 



78
79
80
 
# File 'lib/ffmprb/filter.rb', line 78

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

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



82
83
84
85
86
87
88
89
90
91
92
 
# File 'lib/ffmprb/filter.rb', line 82

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 



94
95
96
97
98
99
100
101
102
103
104
105
106
107
 
# File 'lib/ffmprb/filter.rb', line 94

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 



109
110
111
112
 
# File 'lib/ffmprb/filter.rb', line 109

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 



303
304
305
306
307
308
 
# File 'lib/ffmprb/filter.rb', line 303

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

.concat_a(inputs, output = nil) ⇒ Object 



119
120
121
122
 
# File 'lib/ffmprb/filter.rb', line 119

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

.concat_av(inputs, output = nil) ⇒ Object 



124
125
126
127
 
# File 'lib/ffmprb/filter.rb', line 124

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

.concat_v(inputs, output = nil) ⇒ Object 



114
115
116
117
 
# File 'lib/ffmprb/filter.rb', line 114

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

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



129
130
131
 
# File 'lib/ffmprb/filter.rb', line 129

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

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

TODO unused at the moment



134
135
136
 
# File 'lib/ffmprb/filter.rb', line 134

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 



138
139
140
141
 
# File 'lib/ffmprb/filter.rb', line 138

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 



143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
 
# File 'lib/ffmprb/filter.rb', line 143

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 



179
180
181
 
# File 'lib/ffmprb/filter.rb', line 179

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 



183
184
185
 
# File 'lib/ffmprb/filter.rb', line 183

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

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



187
188
189
 
# File 'lib/ffmprb/filter.rb', line 187

def interpolate_v(fps, input=nil, output=nil)
  inout 'framerate=fps=%{fps}', input, output, fps: fps
end

.nullsink(input = nil) ⇒ Object

NOTE might be very useful with UGC: def cropdetect



194
195
196
 
# File 'lib/ffmprb/filter.rb', line 194

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

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



198
199
200
 
# File 'lib/ffmprb/filter.rb', line 198

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 



202
203
204
205
206
207
208
209
 
# File 'lib/ffmprb/filter.rb', line 202

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

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



211
212
213
 
# File 'lib/ffmprb/filter.rb', line 211

def pp(input=nil, output=nil)
  inout 'pp=hb/vb/dr/al', input, output
end

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



215
216
217
 
# File 'lib/ffmprb/filter.rb', line 215

def reverse(input=nil, output=nil)
  inout 'reverse', input, output
end

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



227
228
229
230
231
232
233
 
# File 'lib/ffmprb/filter.rb', line 227

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 



235
236
237
238
239
240
 
# File 'lib/ffmprb/filter.rb', line 235

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 



242
243
244
245
246
247
 
# File 'lib/ffmprb/filter.rb', line 242

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

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



223
224
225
 
# File 'lib/ffmprb/filter.rb', line 223

def setpts(ratio, input=nil, output=nil)
  inout 'setpts=%{r_fps}*PTS', input, output, r_fps: 1.0/ratio
end

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



219
220
221
 
# File 'lib/ffmprb/filter.rb', line 219

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

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



249
250
251
252
 
# File 'lib/ffmprb/filter.rb', line 249

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 



254
255
256
 
# File 'lib/ffmprb/filter.rb', line 254

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



260
261
262
 
# File 'lib/ffmprb/filter.rb', line 260

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

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



264
265
266
267
 
# File 'lib/ffmprb/filter.rb', line 264

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 



269
270
271
272
 
# File 'lib/ffmprb/filter.rb', line 269

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



275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
 
# File 'lib/ffmprb/filter.rb', line 275

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 



298
299
300
 
# File 'lib/ffmprb/filter.rb', line 298

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