VLC使用Lua编写脚本:跳转到文件中的特定时间？

Question

这似乎应该很简单,但我在这里空手而归.我正在尝试创建一个简单的VLC脚本来检查"随机"按钮是否打开,如果是,当它跳转到随机文件时,而不是从时间= 0开始,它会在随机时间开始.

到目前为止,它看起来像我应该是一个播放列表脚本,我可以从播放列表对象获取持续时间,但在这个文档页面或谷歌,我似乎无法找到任何方式跳转到特定时间在Lua脚本中.有没有人有更多使用Lua控制VLC播放的经验？

Answer 1

实际上,文档确实说你可以做到......虽然不是那么多的话.以下是有关播放列表解析器界面的说明:

VLC Lua playlist modules should define two functions:
   * probe(): returns true if we want to handle the playlist in this script
   * parse(): read the incoming data and return playlist item(s)
        Playlist items use the same format as that expected in the
        playlist.add() function (see general lua/README.txt)

如果您按照说明进行操作,playlist.add()则说明这些项目包含您可以提供的大量字段.有很多的选择(.name,.title,.artist等),但唯一需要的人似乎是.path......这是"该项目的完整路径/ URL".

没有明确提到在哪里寻找,但你可以选择提供的参数之一.options,据说是"VL​​C选项列表.它给出fullscreen了一个例子.如果并行--fullscreen工作,可以像其他命令行选项一样--start-time还有--stop-time工作吗？

在我的系统上,他们这样做,这是脚本!

-- randomseek.lua
--
-- A compiled version of this file (.luac) should be put into the proper VLC
-- playlist parsers directory for your system type.  See:
--
--   http://wiki.videolan.org/Documentation:Play_HowTo/Building_Lua_Playlist_Scripts
--
-- The file format is extremely simple and is merely alternating lines of
-- filenames and durations, such as if you had a file "example.randomseek"
-- it might contain:
--
--     foo.mp4
--     3:04
--     bar.mov
--     10:20
--
-- It simply will seek to a random location in the file and play a random
-- amount of the remaining time in the clip.

function probe()
    -- seed the random number since other VLC lua plugins don't seem to
    math.randomseed(os.time())

    -- tell VLC we will handle anything ending in ".randomseek"
    return string.match(vlc.path, ".randomseek$")
end

function parse()
    -- VLC expects us to return a list of items, each item itself a list
    -- of properties
    playlist = {}

    -- I'll assume a well formed input file but obviously you should do
    -- error checking if writing something real
    while true do
       playlist_item = {}

       line = vlc.readline()
       if line == nil then
           break --error handling goes here
       end

       playlist_item.path = line

       line = vlc.readline()
       if line == nil then
           break --error handling goes here
       end

       for _min, _sec in string.gmatch( line, "(%d*):(%d*)" )
           do
               duration = 60 * _min + _sec
           end

       -- math.random with integer argument returns an integer between
       -- one and the number passed in inclusive, VLC uses zero based times
       start_time = math.random(duration) - 1
       stop_time = math.random(start_time, duration - 1)

       -- give the viewer a hint of how long the clip will take
       playlist_item.duration = stop_time - start_time

       -- a playlist item has another list inside of it of options
       playlist_item.options = {}
       table.insert(playlist_item.options, "start-time="..tostring(start_time))
       table.insert(playlist_item.options, "stop-time="..tostring(stop_time))
       table.insert(playlist_item.options, "fullscreen")

       -- add the item to the playlist
       table.insert( playlist, playlist_item )
    end

    return playlist
end

Answer 2

只要用这个:

vlc.var.set(input, "time", time)