├── LICENSE
├── README.md
└── skip-intro.lua


/LICENSE:
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 1 | MIT License
 2 | 
 3 | Copyright (c) 2018 Arthur Jochems
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


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/README.md:
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 1 | # skip-intro.lua
 2 | 
 3 | This script skips to the next moment of silence in the video. The intended use for this is to skip until the end of an opening sequence, at which point there's often a short period of silence.
 4 | 
 5 | ## Setup
 6 | Install [mpv media player](https://mpv.io/ "mpv-link").
 7 | 
 8 | Download **skip-intro.lua** and save it to `mpv/scripts/`.
 9 | 
10 | The default keybind to *start/stop* skipping is `Tab`.<br />
11 | You can change this by adding to `mpv/input.conf` the following line:
12 | ```
13 | NEW_KEY script-binding skip-key
14 | ```
15 | 
16 | To tweak the script's parameters you can copy the following code to `mpv/script-opts/skip-intro.conf`:
17 | ```
18 | # Maximum noise (dB) to trigger
19 | quietness = -30
20 | 
21 | # Minimum silence duration (s) to trigger
22 | duration = 0.5
23 | ```
24 | 


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/skip-intro.lua:
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  1 | MAX_SPEED = 100
  2 | NORMAL_SPEED = 1
  3 | ONE_SECOND = 1
  4 | skip = false
  5 | -- Max noise (dB) and min silence duration (s) to trigger
  6 | opts = { quietness = -30, duration = 0.5 }
  7 | 
  8 | 
  9 | function setOptions()
 10 |     local options = require 'mp.options'
 11 |     options.read_options(opts)
 12 | end
 13 | 
 14 | function setTime(time)
 15 |     mp.set_property_number('time-pos', time)
 16 | end
 17 | 
 18 | function getTime()
 19 |     return mp.get_property_native('time-pos')
 20 | end
 21 | 
 22 | function setSpeed(speed)
 23 |     mp.set_property('speed', speed)
 24 | end
 25 | 
 26 | function setPause(state)
 27 |     mp.set_property_bool('pause', state)
 28 | end
 29 | 
 30 | function setMute(state)
 31 |     mp.set_property_bool('mute', state)
 32 | end
 33 | 
 34 | function initAudioFilter()
 35 |     local af_table = mp.get_property_native('af')
 36 |     af_table[#af_table + 1] = {
 37 |         enabled = false,
 38 |         label   = 'silencedetect',
 39 |         name    = 'lavfi',
 40 |         params  = { graph = 'silencedetect=noise=' .. opts.quietness .. 'dB:d=' .. opts.duration }
 41 |     }
 42 |     mp.set_property_native('af', af_table)
 43 | end
 44 | 
 45 | function initVideoFilter()
 46 |     local vf_table = mp.get_property_native('vf')
 47 |     vf_table[#vf_table + 1] = {
 48 |         enabled = false,
 49 |         label   = 'blackout',
 50 |         name    = 'lavfi',
 51 |         params  = { graph = '' }
 52 |     }
 53 |     mp.set_property_native('vf', vf_table)
 54 | end
 55 | 
 56 | function setAudioFilter(state)
 57 |     local af_table = mp.get_property_native('af')
 58 |     if #af_table > 0 then
 59 |         for i = #af_table, 1, -1 do
 60 |             if af_table[i].label == 'silencedetect' then
 61 |                 af_table[i].enabled = state
 62 |                 mp.set_property_native('af', af_table)
 63 |                 break
 64 |             end
 65 |         end
 66 |     end
 67 | end
 68 | 
 69 | function dim(state)
 70 |     local dim = { width = 0, height = 0 }
 71 |     if state == true then
 72 |         dim.width = mp.get_property_native('width')
 73 |         dim.height = mp.get_property_native('height')
 74 |     end
 75 |     return dim.width .. 'x' .. dim.height
 76 | end
 77 | 
 78 | function setVideoFilter(state)
 79 |     local vf_table = mp.get_property_native('vf')
 80 |     if #vf_table > 0 then
 81 |         for i = #vf_table, 1, -1 do
 82 |             if vf_table[i].label == 'blackout' then
 83 |                 vf_table[i].enabled = state
 84 |                 vf_table[i].params  = { graph = 'nullsink,color=c=black:s=' .. dim(state) }
 85 |                 mp.set_property_native('vf', vf_table)
 86 |                 break
 87 |             end
 88 |         end
 89 |     end
 90 | end
 91 | 
 92 | function silenceTrigger(name, value)
 93 |     if value == '{}' or value == nil then
 94 |         return
 95 |     end
 96 | 
 97 |     local skipTime = tonumber(string.match(value, '%d+%.?%d+'))
 98 |     local currTime = getTime()
 99 | 
100 |     if skipTime == nil or skipTime < currTime + ONE_SECOND then
101 |         return
102 |     end
103 | 
104 |     stopSkip()
105 |     setTime(skipTime)
106 |     skip = false
107 | end
108 | 
109 | function setAudioTrigger(state)
110 |     if state == true then
111 |         mp.observe_property('af-metadata/silencedetect', 'string', silenceTrigger)
112 |     else
113 |         mp.unobserve_property(silenceTrigger)   
114 |     end
115 | end
116 | 
117 | function startSkip()
118 |     startTime = getTime()
119 |     -- This audio filter detects moments of silence
120 |     setAudioFilter(true)
121 |     -- This video filter makes fast-forward faster
122 |     setVideoFilter(true)
123 |     setAudioTrigger(true)
124 |     setPause(false)
125 |     setMute(true)
126 |     setSpeed(MAX_SPEED)
127 | end
128 | 
129 | function stopSkip()
130 |     setAudioFilter(false)
131 |     setVideoFilter(false)
132 |     setAudioTrigger(false)
133 |     setMute(false)
134 |     setSpeed(NORMAL_SPEED)
135 | end
136 | 
137 | function keypress()
138 |     skip = not skip
139 |     if skip then
140 |         startSkip()
141 |     else
142 |         stopSkip()
143 |         setTime(startTime)
144 |     end
145 | end
146 | 
147 | setOptions(opts)
148 | initAudioFilter()
149 | initVideoFilter()
150 | 
151 | mp.add_key_binding('Tab', 'skip-key', keypress)
152 | 


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