大多数video不能从YouTube获取VideoUrl
我使用“ https://www.youtube.com/get_video_info ”获取video信息，缩略图图片和videourl
在自定义video播放器中播放video，但点击“vevo频道”video时。
它不会返回任何videourl。 我也尝试“get_video_info”API中的不同参数。 例如：
https://www.youtube.com/get_video_info?hl=zh-CN&video_id=0KSOMA3QBU0&eurl=&el= embedded ＆gl = US＆ps =默认
https://www.youtube.com/get_video_info?hl=zh-CN&video_id=0KSOMA3QBU0&eurl=&el= 详细信息 ＆gl = US＆ps =默认
https://www.youtube.com/get_video_info?hl=zh-CN&video_id=0KSOMA3QBU0&eurl=&el= vevo ＆gl = US＆ps = default
https://www.youtube.com/get_video_info?hl=en&video_id=0KSOMA3QBU0&eurl=&el=&gl=US&ps=default
有很多video没有得到video信息。 有以下video，它没有得到video信息。
但我们可以在一些实时应用程序中播放这些video
https://play.google.com/store/apps/details?id=com.tfsapps.playtube2
https://itunes.apple.com/in/app/itube-playlist-management/id789819758?mt=8
https://itunes.apple.com/ca/app/itube-free-music-playlists/id866761482?mt=8
如何可能？
如果我想播放所有的video，那么解决scheme是什么？
从YouTube获取videoUrl的url是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
你可以把它翻译成Objective-C代码。
希望这可以帮助。
这种types的video只能在embedded真实网站时播放。 我们不通过API公开这些列表。
这个博客文章还有一些细节：
http://apiblog.youtube.com/2011/12/understanding-playback-restrictions.html