mirror of https://github.com/mpv-player/mpv
266 lines
9.2 KiB
Lua
266 lines
9.2 KiB
Lua
--[[
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Automatically skip in files if video frames with pre-supplied fingerprints are
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detected. This will skip ahead by a pre-configured amount of time if a matching
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video frame is detected.
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This requires the vf_fingerprint video filter to be compiled in. Read the
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documentation of this filter for caveats (which will automatically apply to
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this script as well), such as no support for zero-copy hardware decoding.
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You need to manually gather and provide fingerprints for video frames and add
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them to a configuration file in script-opts/skip-logo.conf (the "script-opts"
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directory must be in the mpv configuration directory, typically ~/.config/mpv/).
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Example script-opts/skip-logo.conf:
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cases = {
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{
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-- Skip ahead 10 seconds if a black frame was detected
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-- Note: this is dangerous non-sense. It's just for demonstration.
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name = "black frame", -- print if matched
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skip = 10, -- number of seconds to skip forward
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score = 0.3, -- required score
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fingerprint = "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
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},
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{
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-- Skip ahead 20 seconds if a white frame was detected
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-- Note: this is dangerous non-sense. It's just for demonstration.
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name = "fun2",
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skip = 20,
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fingerprint = "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
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},
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}
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This is actually a lua file. Lua was chosen because it seemed less of a pain to
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parse. Future versions of this script may change the format.
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The fingerprint is a video frame, converted to "gray" (8 bit per pixels), full
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range, each pixel concatenated into an array, converted to a hex string. You
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can produce these fingerprints by running this manually:
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mpv --vf=fingerprint:print yourfile.mkv
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This will log the fingerprint of each video frame to the console, along with its
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timestamp. You find the fingerprint of a unique-enough looking frame, and add
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it as entry to skip-logo.conf.
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You can provide a score for "fuzziness". If no score is provided, a default
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value of 0.3 is used. The score is inverse: 0 means exactly the same, while a
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higher score means a higher difference. Currently, the score is computed as
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euclidean distance between the video frame and the pre-provided fingerprint,
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thus the highest score is 16. You probably want a score lower than 1 at least.
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(This algorithm is very primitive, but also simple and fast to compute.)
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There's always the danger of false positives, which might be quite annoying.
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It's up to you what you hate more, the logo, or random skips if false positives
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are detected. Also, it's always active, and might eat too much CPU with files
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that have a high resolution or framerate. To temporarily disable the script,
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having a keybind like this in your input.conf will be helpful:
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ctrl+k vf toggle @skip-logo
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This will disable/enable the fingerprint filter, which the script automatically
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adds at start.
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Another important caveat is that the script currently disables matching during
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seeking or playback initialization, which means it cannot match the first few
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frames of a video. This could be fixed, but the author was too lazy to do so.
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--]]
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local utils = require "mp.utils"
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local msg = require "mp.msg"
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local label = "skip-logo"
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local meta_property = string.format("vf-metadata/%s", label)
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local config = {}
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local cases = {}
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local cur_bmp
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local seeking = false
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local playback_start_pts = nil
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-- Convert a hex string to an array. Convert each byte to a [0,1] float by
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-- interpreting it as normalized uint8_t.
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-- The data parameter, if not nil, may be used as storage (avoiding garbage).
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local function hex_to_norm8(hex, data)
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local size = math.floor(#hex / 2)
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if #hex ~= size * 2 then
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return nil
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end
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local res
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if (data ~= nil) and (#data == size) then
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res = data
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else
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res = {}
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end
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for i = 1, size do
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local num = tonumber(hex:sub(i * 2, i * 2 + 1), 16)
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if num == nil then
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return nil
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end
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res[i] = num / 255.0
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end
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return res
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end
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local function compare_bmp(a, b)
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if #a ~= #b then
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return nil -- can't compare
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end
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local sum = 0
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for i = 1, #a do
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local diff = a[i] - b[i]
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sum = sum + diff * diff
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end
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return math.sqrt(sum)
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end
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local function load_config()
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local conf_file = mp.find_config_file("script-opts/skip-logo.conf")
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local conf_fn
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local err = nil
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if conf_file then
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if setfenv then
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conf_fn, err = loadfile(conf_file)
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if conf_fn then
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setfenv(conf_fn, config)
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end
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else
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conf_fn, err = loadfile(conf_file, "t", config)
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end
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else
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err = "config file not found"
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end
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if conf_fn and (not err) then
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local ok, err2 = pcall(conf_fn)
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err = err2
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end
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if err then
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msg.error("Failed to load config file:", err)
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end
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if config.cases then
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for n, case in ipairs(config.cases) do
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local err = nil
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case.bitmap = hex_to_norm8(case.fingerprint)
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if case.bitmap == nil then
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err = "invalid or missing fingerprint field"
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end
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if case.score == nil then
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case.score = 0.3
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end
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if type(case.score) ~= "number" then
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err = "score field is not a number"
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end
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if type(case.skip) ~= "number" then
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err = "skip field is not a number or missing"
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end
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if case.name == nil then
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case.name = ("Entry %d"):format(n)
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end
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if err == nil then
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cases[#cases + 1] = case
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else
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msg.error(("Entry %s: %s, ignoring."):format(case.name, err))
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end
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end
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end
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end
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load_config()
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-- Returns true on match and if something was done.
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local function check_fingerprint(hex, pts)
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local bmp = hex_to_norm8(hex, cur_bmp)
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cur_bmp = bmp
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-- If parsing the filter's result failed (well, it shouldn't).
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assert(bmp ~= nil, "filter returned nonsense")
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for _, case in ipairs(cases) do
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local score = compare_bmp(case.bitmap, bmp)
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if (score ~= nil) and (score <= case.score) then
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msg.warn(("Matching %s: score=%f (required: %f) at %s, skipping %f seconds"):
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format(case.name, score, case.score, mp.format_time(pts), case.skip))
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mp.commandv("seek", pts + case.skip, "absolute+exact")
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return true
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end
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end
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return false
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end
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local function read_frames()
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local result = mp.get_property_native(meta_property)
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if result == nil then
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return
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end
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-- Try to get all entries. Out of laziness, assume that there are at most
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-- 100 entries. (In fact, vf_fingerprint limits it to 10.)
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for i = 0, 99 do
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local prefix = string.format("fp%d.", i)
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local hex = result[prefix .. "hex"]
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local pts = tonumber(result[prefix .. "pts"])
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if (hex == nil) or (pts == nil) then
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break
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end
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local skip = false -- blame Lua for not having "continue" or "goto", not me
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-- If seeking just stopped, there will be frames before the seek target,
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-- ignore them by checking the timestamps.
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if playback_start_pts ~= nil then
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if pts >= playback_start_pts then
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playback_start_pts = nil -- just for robustness
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else
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skip = true
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end
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end
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if not skip then
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if check_fingerprint(hex, pts) then
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break
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end
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end
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end
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end
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mp.observe_property(meta_property, "none", function()
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-- Ignore frames that are decoded/filtered during seeking.
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if seeking then
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return
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end
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read_frames()
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end)
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mp.observe_property("seeking", "bool", function(name, val)
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seeking = val
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if seeking == false then
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playback_start_pts = mp.get_property_number("playback-time")
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read_frames()
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end
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end)
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local filters = mp.get_property_native("option-info/vf/choices", {})
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local found = false
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for _, f in ipairs(filters) do
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if f == "fingerprint" then
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found = true
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break
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end
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end
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if found then
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mp.command(("no-osd vf add @%s:fingerprint"):format(label, filter))
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else
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msg.warn("vf_fingerprint not found")
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end
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