分离音频左右声道

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此方法同样适用于多声道音频分离。

sylion 提问：

很久以前，我好像在本论坛看过一个帖子，讲的是用 REAPER 制作消音伴奏的。大致是把伴奏音频轨左右声道分离，然后把其中一个声道反转等等等。现在那个帖子找不到了。想尝试一下，竟然找不到分离左右声道的方法了，怎么弄，伴奏轨都是整体一块，做不到上下两个的。应该怎么弄呢？我在 Action List 里面用 split 搜索都没找到需要的动作。

提炼得到的方法

对着音频块右键，选择Item processing > Explode multichannel audio or MIDI items to new one-channel items。

对着音频块右键，选择Item settings > Take channel mode...选择一个声道，或进行下混缩。

通过扩展脚本实现（见下文）。

bobo198504 的原回答：

也可以复制一轨，在这个菜单的第一项，把一轨设成 Left，一轨设成 Right。

todoublez 的原回答：

去年剛好有寫一個這個腳本...拿去試試吧

（点击展开）

--[[


      ___           ___           ___           ___           ___           ___     
     /\  \         /\  \         /\  \         /\  \         /\  \         /\__\    
    /::\  \       /::\  \       /::\  \       /::\  \       /::\  \       /::|  |   
   /:/\:\  \     /:/\:\  \     /:/\:\  \     /:/\:\  \     /:/\:\  \     /:|:|  |   
  /:/  \:\  \   /::\~\:\  \   /::\~\:\  \   /::\~\:\__\   /:/  \:\  \   /:/|:|  |__ 
 /:/__/ \:\__\ /:/\:\ \:\__\ /:/\:\ \:\__\ /:/\:\ \:|__| /:/__/ \:\__\ /:/ |:| /\__\
 \:\  \  \/__/ \/__\:\/:/  / \/_|::\/:/  / \:\~\:\/:/  / \:\  \ /:/  / \/__|:|/:/  /
  \:\  \            \::/  /     |:|::/  /   \:\ \::/  /   \:\  /:/  /      |:/:/  / 
   \:\  \           /:/  /      |:|\/__/     \:\/:/  /     \:\/:/  /       |::/  /  
    \:\__\         /:/  /       |:|  |        \::/__/       \::/  /        /:/  /   
     \/__/         \/__/         \|__|         ~~            \/__/         \/__/    



 * ReaScript Name: Split Stereo Item to mono (with dialogue)
 * Author: todoublez / X-raym
 * Repository: CARBON Premium Scripts
 * Licence: GPL v3
 * REAPER: 5.0
 * Version: 1.2.0

 * Changelog:
 * v1.1 + Conditions to item selection.Preventing wrong track removal if mono item was selected.
 * v1.2 + Rearrange UndoBlock.
          
 * v1.2 (2019-10-07)
 * v1.1 (2019-10-07)
 * v1.0 (2019-10-06)
 + Initial Release

--]]

------------------------------USER--CONFIG--AREA---------------------------
                                                                         --
       Channel_number = 2-- mono:1 /stereo:2 /5.1surround:6 etc..        --
                                                                         --
-----------------------------SCRIPT--STARTS--BELOW-------------------------




-------------------------USERS--ITEM--SELECTION'S--FILTER-----------------------



function main(output) -- local (i, j, item, take, track)

  reaper.Undo_BeginBlock() -- Begining of the undo block. Leave it at the top of your main function.


  -- GET SELECTED NOTES (from 0 index)
  for i = 0, count_sel_items-1 do
        
    item = reaper.GetSelectedMediaItem(0, count_sel_items-1-i)
    take = reaper.GetActiveTake(item)
    
    if take ~= nil then
    
      if reaper.TakeIsMIDI(take) == false then
    
        take_pcm = reaper.GetMediaItemTake_Source(take)
      
        take_pcm_chan = reaper.GetMediaSourceNumChannels(take_pcm)
        take_chan_mod = reaper.GetMediaItemTakeInfo_Value(take, "I_CHANMODE")
        
        select = 0
        
        if output == 1 and ((take_chan_mod > 1 and take_chan_mod < 67) or take_pcm_chan == 1) then
          select = 1
        end
        
        if output == 2 and (take_chan_mod > 66 or (take_chan_mod <= 1 and take_pcm_chan == output)) then
          select = 1
        end
        
        if output > 1 and take_chan_mod <= 1 and take_pcm_chan == output then
          select = 1
        end
        
        if select == 0 then reaper.SetMediaItemSelected(item, false) end
      
      else
        reaper.SetMediaItemSelected(item, false)
      end
      
    else
      reaper.SetMediaItemSelected(item, false)
    end
      
  end

end


----------DESELECT--ITEMS--AFTER--FILTERING--USER'S--ITEMs--SELECTION--------


count_sel_items = reaper.CountSelectedMediaItems(0)

output = Channel_number--VALUE FROM "USER'S CONFIG AREA" FROM TOP OF THE SCRIPT

if count_sel_items > 0 and output ~= "" then

  reaper.PreventUIRefresh(1)
  
  output = tonumber(output)
  
  if output ~= nil then
    main(output) -- Execute your main function
  end
  
  reaper.UpdateArrange() -- Update the arrangement (often needed)

  reaper.PreventUIRefresh(-1)
  
end



--------------------SPLIT--STEREO--ITEMS--TO--2--MONO--ITEMS-------------------


local function main()
  reaper.PreventUIRefresh(1)

local retval = reaper.ShowMessageBox( "Exploding selected items to mono items\nCreat folder(s) for each pair of L/R items?", "Split Stereo Item to mono", 3, 6, true )--pop up 2 choices to make


        if retval == 6 then --6 means Yes

             reaper.Main_OnCommand(40894, 0)--explode selected item(s)
             reaper.Main_OnCommand(40006, 0)--remove selected item(s)
           end

        
        if retval == 7 then --7 means No

            reaper.Main_OnCommand(40894, 0)--explode selected item
            reaper.Main_OnCommand( reaper.NamedCommandLookup("_SWS_SELTRKWITEM"), 0)--Select only track(s) with selected item(s) 
            reaper.Main_OnCommand(1041, 0)--Cycle track folder state
            reaper.Main_OnCommand(40005, 0)--remove selected track(s)         
          end
          
  reaper.Undo_EndBlock('explode', 0)--undo block ends here        
  reaper.PreventUIRefresh(-1)
  reaper.UpdateArrange()
  reaper.UpdateTimeline()
end
main()

它會問你要不要為新的左右聲道軌創建 Folder 你可以選要或不要然後就拆了

你可以選擇直接拷貝上面代碼或是下載附件腳本... 我不知道你習慣怎麼新增腳本，所以我就兩個都附上了。都是一樣的東西。

這個腳本是 work on item 的，所以記得選中你想拆的 item 再執行腳本哦。

main core coded by X-raym

modded by todoublez

cheers