YouTube直播fmt_stream_map質量

我通過解析「FMT流圖」獲得流網址，YouTube直播fmt_stream_map質量

的問題是，如果我的視頻時長在1小時內，我得到這個：

{ 
"comment_count" = 1; 
description = ""; 
"dislikes_num" = 0; 
duration = "54:46"; 
"encrypted_id" = WWjNEyHrNsk; 
"fmt_stream_map" =  (
      { 
     "fallback_host" = "tc.v7.cache6.c.youtube.com"; 
     itag = 22; 
     quality = hd720; 
     type = "video/mp4; codecs=\"avc1.64001F, mp4a.40.2\""; 
     url = "http://r4---sn-bvvbax-8pxl.c.youtube.com/videoplayback?sver=3&ipbits=8&itag=22&key=yt1&expire=1366039593&upn=phUk9-1Fjyw&signature=34CDFF5AAC4E5BB24177EAA001B5519E0218A04E.A437435FC87FD09D7AD95E0417A4EA77BC786C86&ms=au&mv=m&mt=1366015457&app=youtube_mobile&ip=85.127.44.131&fexp=906370%2C923120%2C932000%2C932004%2C906383%2C916911%2C916910%2C902000%2C901208%2C919512%2C929903%2C925714%2C931202%2C900821%2C900823%2C931203%2C906090%2C909419%2C908529%2C930807%2C919373%2C930803%2C906836%2C920201%2C929602%2C930101%2C930609%2C926403%2C900824&sparams=cp%2Cid%2Cip%2Cipbits%2Citag%2Cratebypass%2Csource%2Cupn%2Cexpire&el=watch&newshard=yes&id=5968cd1321eb36c9&cp=U0hVS1BOV19OTUNONV9ISEFGOmh3anpiZHFRODBI&dnc=1&yms=izkxzhrL53I&source=youtube&ratebypass=yes"; 
    }, 
      { 
     "fallback_host" = "tc.v14.cache4.c.youtube.com"; 
     itag = 18; 
     quality = medium; 
     type = "video/mp4; codecs=\"avc1.42001E, mp4a.40.2\""; 
     url = "http://r4---sn-bvvbax-8pxl.c.youtube.com/videoplayback?sver=3&ipbits=8&itag=18&key=yt1&expire=1366039593&upn=phUk9-1Fjyw&signature=BCA6FFE2575EE8947CFF52E91D0C8896538E239F.33FE7FF507257A8F5161A1E4C80A101BE4EB693F&ms=au&mv=m&mt=1366015457&app=youtube_mobile&ip=85.127.44.131&fexp=906370%2C923120%2C932000%2C932004%2C906383%2C916911%2C916910%2C902000%2C901208%2C919512%2C929903%2C925714%2C931202%2C900821%2C900823%2C931203%2C906090%2C909419%2C908529%2C930807%2C919373%2C930803%2C906836%2C920201%2C929602%2C930101%2C930609%2C926403%2C900824&sparams=cp%2Cid%2Cip%2Cipbits%2Citag%2Cratebypass%2Csource%2Cupn%2Cexpire&el=watch&newshard=yes&id=5968cd1321eb36c9&cp=U0hVS1BOV19OTUNONV9ISEFGOmh3anpiZHFRODBI&dnc=1&yms=izkxzhrL53I&source=youtube&ratebypass=yes"; 
    }, 
      { 
     "fallback_host" = "tc.v3.cache3.c.youtube.com"; 
     itag = 36; 
     quality = small; 
     type = "video/3gpp; codecs=\"mp4v.20.3, mp4a.40.2\""; 
     url = "http://r4---sn-bvvbax-8pxl.c.youtube.com/videoplayback?sver=3&ipbits=8&itag=36&key=yt1&expire=1366039593&upn=phUk9-1Fjyw&signature=8174E39396391843AFA940C30624A823E5275890.B323AA44059ED3928A47C4AEA1BC82F3C565F433&ms=au&mv=m&mt=1366015457&app=youtube_mobile&ip=85.127.44.131&fexp=906370%2C923120%2C932000%2C932004%2C906383%2C916911%2C916910%2C902000%2C901208%2C919512%2C929903%2C925714%2C931202%2C900821%2C900823%2C931203%2C906090%2C909419%2C908529%2C930807%2C919373%2C930803%2C906836%2C920201%2C929602%2C930101%2C930609%2C926403%2C900824&sparams=cp%2Cid%2Cip%2Cipbits%2Citag%2Cratebypass%2Csource%2Cupn%2Cexpire&el=watch&newshard=yes&id=5968cd1321eb36c9&cp=U0hVS1BOV19OTUNONV9ISEFGOmh3anpiZHFRODBI&dnc=1&yms=izkxzhrL53I&source=youtube&ratebypass=yes"; 
    } 
); 
"length_seconds" = 3286; 
"likes_num" = 7; 
longform = 1; 
playability = "PLAY_OK"; 
"player_type" = desktop; 
"profile_url" = "/user/KapfenbergWebTV"; 
"public_name" = KapfenbergWebTV; 
"thumbnail_for_watch" = "http://i.ytimg.com/vi/WWjNEyHrNsk/hqdefault.jpg?w=600&h=360&sigh=5t9yhLmY66cc2ZBb6gJyOaNOsRs"; 
"thumbnail_info" = "<null>"; 
"time_created_text" = "Feb 6, 2013"; 
title = "HiWay-TV Sendung 3 - 2013"; 
"user_image_url" = "//s.ytimg.com/yts/img/silhouette32-vflu0yzhs.png"; 
"view_count" = "1,593"; 
"watch_link" = "/watch?v=WWjNEyHrNsk"; 
}

不同性質。

但如果我的視頻時長超過1小時，我只得到像小質量：

{ 
"comment_count" = 0; 
description = ""; 
"dislikes_num" = 0; 
duration = "1:00:47"; 
"encrypted_id" = taiK0WKSApg; 
"fmt_stream_map" =  (
      { 
     "fallback_host" = "tc.v1.cache6.c.youtube.com"; 
     itag = 36; 
     quality = small; 
     type = "video/3gpp; codecs=\"mp4v.20.3, mp4a.40.2\""; 
     url = "http://r6---sn-bvvbax-8pxe.c.youtube.com/videoplayback?ratebypass=yes&fexp=906370%2C923120%2C932000%2C932004%2C906383%2C916911%2C916910%2C902000%2C901208%2C919512%2C929903%2C925714%2C931202%2C900821%2C900823%2C931203%2C906090%2C909419%2C908529%2C930807%2C919373%2C930803%2C906836%2C920201%2C929602%2C930101%2C930609%2C926403%2C900824&signature=9B83CFB7B240D7DA86E0ED4EC0DFFCFF4151D85B.81CBC92237B653BA3BF7E0E52A730B324EFD70A8&key=yt1&id=b5a88ad162920298&newshard=yes&mt=1366015334&sparams=cp%2Cid%2Cip%2Cipbits%2Citag%2Cratebypass%2Csource%2Cupn%2Cexpire&mv=m&ms=au&ip=85.127.44.131&el=watch&yms=izkxzhrL53I&itag=36&upn=j7RXkiXzhRI&source=youtube&cp=U0hVS1BOV19OUkNONV9ISEFHOm13anpiZHFROTBN&expire=1366039698&ipbits=8&sver=3&dnc=1&app=youtube_mobile"; 
    } 
); 
"length_seconds" = 3647; 
"likes_num" = 6; 
longform = 1; 
playability = "PLAY_OK"; 
"player_type" = desktop; 
"profile_url" = "/user/KapfenbergWebTV"; 
"public_name" = KapfenbergWebTV; 
"thumbnail_for_watch" = "http://i.ytimg.com/vi/taiK0WKSApg/hqdefault.jpg?w=600&h=360&sigh=6hxibWtgHUAnZzNL9bBYxIQRScU"; 
"thumbnail_info" = "<null>"; 
"time_created_text" = "Apr 3, 2013"; 
title = "HiWay-TV Sendung 07 2013"; 
"user_image_url" = "//s.ytimg.com/yts/img/silhouette32-vflu0yzhs.png"; 
"view_count" = 974; 
"watch_link" = "/watch?v=taiK0WKSApg"; 

}

有誰知道問題出在哪裏？

來源

2013-04-15 Stefan Deutschmann

它不依賴於持續時間，它取決於可用的質量。如果質量可用，則解析（url_encoded_fmt_stream_map）塊時出現問題。

您可以檢查此塊和它的內容與你的分析結果進行比較。「url_encoded_fmt_stream_map」：「...............」

來源

2013-10-06 08:27:16 OmarElsherif

持續時間並不重要。該視頻支持多種格式和質量。你需要選擇一個可用的。

我有一塊上ITAG我的代碼庫希望這可以幫助。

function GetScreenTag(iTag: Byte): String; 
begin 
    case iTag of 
    5: Result := 'Low Quality, 240p, FLV, 400x240'; 
    17: Result := 'Low Quality, 144p, 3GP, 0x0'; 
    18: Result := 'Medium Quality, 360p, MP4, 480x360'; 
    22: Result := 'High Quality, 720p, MP4, 1280x720'; 
    34: Result := 'Medium Quality, 360p, FLV, 640x360'; 
    35: Result := 'Standard Definition, 480p, FLV, 854x480'; 
    36: Result := 'Low Quality, 240p, 3GP, 0x0'; 
    37: Result := 'Full High Quality, 1080p, MP4, 1920x1080'; 
    38: Result := 'Original Definition, MP4, 4096x3072'; 
    43: Result := 'Medium Quality, 360p, WebM, 640x360'; 
    44: Result := 'Standard Definition, 480p, WebM, 854x480'; 
    45: Result := 'High Quality, 720p, WebM, 1280x720'; 
    46: Result := 'Full High Quality, 1080p, WebM, 1280x720'; 
    82: Result := 'Medium Quality 3D, 360p, MP4, 640x360'; 
    84: Result := 'High Quality 3D, 720p, MP4, 1280x720'; 
    100: Result := 'Medium Quality 3D, 360p, WebM, 640x360'; 
    102: Result := 'High Quality 3D, 720p, WebM, 1280x720'; 
    else 
     Result := 'NA'; 
    end; 
end;

來源

2014-01-16 01:59:58 XBasic3000

YouTube直播fmt_stream_map質量

回答

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