大多数视频都没有从YouTube获取VideoUrl

2 回答

• 1

  从YouTube检索videoUrl的网址为 https://www.youtube.com/get_video_info?video_id=/*videoId*/&el=vevo&el=embedded&asv=3&sts=15902

  以下是如何通过videoId获取videoUrl . Lua代码：

  -- string.explode(string, separator)
  function string.explode(p, d)
    local t, i
    t={}
    i=0
    if(#p == 1) then return {p} end
      while true do
        l=string.find(p,d,i,true)
        if l~=nil then
          table.insert(t, string.sub(p,i,l-1))
          i=l+1
        else
          table.insert(t, string.sub(p,i))
          break
        end
      end
    return t
  end
  
  -- string.begin_with
  function string.begin_with(str, sub_str)
     return string.find(str, sub_str)==1
  end
  
  -- string.url_decode
  function string.url_decode(str)
    str = string.gsub (str, "+", " ")
    str = string.gsub (str, "%%(%x%x)", function(h) return string.char(tonumber(h,16)) end)
    str = string.gsub (str, "\r\n", "\n")
    return str
  end
  
  -- string.url_query_parameter_map
  function string.url_query_parameter_map(str)
      local params_kv = {}
      for k,v in pairs(string.explode(str, "&")) do
          local eqmark_idx = string.find(v, "=")
          if eqmark_idx ~= nil and eqmark_idx > 1 and eqmark_idx < string.len(v) then
              local param_name = string.sub(v, 1, eqmark_idx-1)
              local param_value = string.sub(v, eqmark_idx+1)
              param_name = string.url_decode(param_name)
              param_value = string.url_decode(param_value)
              --print (param_name .." => " .. param_value)
              params_kv[param_name] = param_value
          else
              params_kv[string.url_decode(v)] = ""
          end
      end
      return params_kv
  end
  
  function string.ytb_sig_charswap(str, pos)
      local c1 = string.sub(str,1,1)
      local pos2 = (pos-1)%string.len(str)+1--lua has index begun at 1!
      local c2 = string.sub(str,pos2,pos2)
  
      return c2..string.sub(str,2,pos2-1)..c1..string.sub(str,pos2+1)
  end
  
  -- string.ytb_sig_decrypt
  function string.ytb_sig_decrypt(str)
      local sig = str
      sig = string.sub(sig, 3)
      sig = string.reverse(sig)
      sig = string.sub(sig, 4)
      sig = string.ytb_sig_charswap(sig, 10)
      sig = string.sub(sig, 4)
      sig = string.ytb_sig_charswap(sig, 44)
      sig = string.sub(sig, 4)
      sig = string.reverse(sig)
      sig = string.ytb_sig_charswap(sig, 24)
      return sig
  end
  
  --local s = "YFRHVIIsjrkkiGDtqKXrh847DI5GKDKokWjjgougGDLanT2rw92V6cuXY5BfPGMsaLwgGUYV76wr1T6W"
  --print(string.ytb_sig_decrypt(s))
  
  -- define the parser function
  -- return: number of video resource, table of video resources, failed reason text.
  parse = function (s)
      local params_kv = string.url_query_parameter_map(s)
      -- print(params_kv["fmt_list"]);
      local fmt_list, fmt_stream = params_kv["fmt_list"],  params_kv["url_encoded_fmt_stream_map"]
      local reason, rental_bar = params_kv["reason"], params_kv["ypc_video_rental_bar_text"]
  
      if (fmt_list == nil or fmt_stream == nil) then
          local reason_text = "reason="
          if (reason ~= nil) then 
              reason_text = reason_text .. reason
          elseif (rental_bar ~= nil) then 
              reason_text = reason_text .. rental_bar
          else 
              reason_text = "reason=This video cannot be played for some unknown reason(unexpected)"
          end
          return 0, {}, reason_text
      end
  
      print(fmt_list)
      --local fmt_infos = {}
      --for k,v in pairs(string.explode(fmt_list, ",")) do
      --  local fmt_info = string.explode(v, "/")
      --  local v_itag, v_reso = fmt_info[1], fmt_info[2] 
      --  fmt_infos[v_itag]=v_reso
      --  print (v_itag.." => "..v_reso)
      --end
  
      local stream_n, stream_infos = 0, {}
      for k,v in pairs(string.explode(fmt_stream, ",")) do
          local s_info = string.url_query_parameter_map(v)
          local v_itag, v_url, v_s, v_sig = s_info["itag"], s_info["url"], s_info["s"], s_info["sig"]
          --print (v_itag.." => "..v_url)
          --print ((v_s or "nil").." ~ "..(v_sig or "nil"))
          if (string.find(v_url, "signature=") ~= nil) then
              v_url = v_url
          elseif (v_sig ~= nil) then
              v_url = v_url.."&signature="..v_sig
          elseif (v_s ~= nil) then
              v_url = v_url.."&signature="..string.ytb_sig_decrypt(v_s)
          else
              v_url = v_url
          end
          stream_infos[v_itag] = v_url
          stream_n=stream_n+1
          print (v_itag.." => "..v_url)
      end
  
      return stream_n, stream_infos, ""
  end
  
  -- multiple return values:
  -- the first one is script version number.
  -- the second one is remote YouTube URL for fetching, with one parameter placeholder "%s".
  -- the third one is the parser entry function object.
  return "14.3.5", "https://www.youtube.com/get_video_info?video_id=%s&el=vevo&el=embedded&asv=3&sts=15902", parse
  

  您可以将其“翻译”为Objective-C代码 .

  希望这可以帮助 .

  回复于 2024-05-09T23:44:44+08:00
• -2

  这种类型的视频只能在嵌入真实网站时播放 . 我们不会通过API公开这些列表 .

  这篇博文还有一些细节：

  http://apiblog.youtube.com/2011/12/understanding-playback-restrictions.html

  回复于 2024-05-09T23:44:44+08:00