> 本文前半部分是分析過程，只看思路的為節省時間建議直接拉到末尾。 > 本文寫於2020年9月8日，不保證此方法在以後的有效性。 ## 分析過程 首先從抖音客戶端找一個視訊，點選分享-複製連結，貼上一下發到電腦上，準備進行下一步，這裡已經準備好了一個從客戶端得到的分享文字。 > 聽說集齊碎片可以召喚神龍！#家鄉變成二次元 #充能計劃 #畫畫 #夏日打卡挑戰 https://v.douyin.com/Jj8eXXu/ 複製此連結，開啟【抖音短視訊】，直接觀看視訊！ 把其中的連結貼上到瀏覽器中訪問一下，得到了這樣的介面：  同時，位址列中的連結變成了: > https://www.iesdouyin.com/share/video/6855476646057643272/?region=CN&mid=6855476868364192519&u_code=1l1346c029b7&titleType=title&utm_source=copy_link&utm_campaign=client_share&utm_medium=android&app=aweme 可見其發生了重定向。 F12審查一下播放區域：  發現這個時候播放區域只有一張背景圖片和一個播放按鈕，點選一下播放試試：  多了一個video標籤，其中的src屬性的值就是視訊的url，所以大膽猜測一下，這個播放地址可能是通過ajax請求得到的。 切換到Network面板，點選xhr，再重新整理一下頁面，果然有一個ajax請求，這個ajax請求帶有一個item_ids的引數，其值應該為視訊的id，可以在頁面重定向後的url中找到這個id：  響應結果是一個json字串，複製到編輯器中格式化後如下： ```json { "extra": { "now": 1599467301000, "logid": "202009071628210101980651031208C5C1" }, "status_code": 0, "item_list": [ { "video_labels": null, "label_top_text": null, "long_video": null, "category": 103, "aweme_id": "6855476646057643272", "desc": "聽說集齊碎片可以召喚神龍！#家鄉變成二次元 #充能計劃 #畫畫 #夏日打卡挑戰", "video_text": null, "forward_id": "0", "mix_info": { "statis": { "collect_vv": 0, "current_episode": 35, "updated_to_episode": 35, "play_vv": 0 }, "desc": "原創不易，不喜勿噴～", "extra": "{\"first_reviewed\":1,\"is_quality_mix\":0,\"next_info\":{\"cover\":\"tos-cn-i-0813/57a48d47c61142748748802d08a75570\",\"desc\":\"原創不易，不喜勿噴～\",\"name\":\"家鄉變成二次元\"}}", "create_time": 1596724793, "mix_id": "6857880767423318030", "cover_url": { "uri": "tos-cn-i-0813/57a48d47c61142748748802d08a75570", "url_list": [ "https://p6-dy-ipv6.byteimg.com/obj/tos-cn-i-0813/57a48d47c61142748748802d08a75570?from=2563711402", "https://p1-dy-ipv6.byteimg.com/obj/tos-cn-i-0813/57a48d47c61142748748802d08a75570?from=2563711402", "https://p26-dy.byteimg.com/obj/tos-cn-i-0813/57a48d47c61142748748802d08a75570?from=2563711402" ] }, "status": { "status": 2, "is_collected": 0 }, "next_info": { "mix_name": "家鄉變成二次元", "desc": "原創不易，不喜勿噴～", "cover_url": { "uri": "tos-cn-i-0813/57a48d47c61142748748802d08a75570", "url_list": [ "https://p1-dy.bytecdn.cn/obj/tos-cn-i-0813/57a48d47c61142748748802d08a75570", "https://p3-dy.bytecdn.cn/obj/tos-cn-i-0813/57a48d47c61142748748802d08a75570", "https://p9-dy.bytecdn.cn/obj/tos-cn-i-0813/57a48d47c61142748748802d08a75570" ] } }, "mix_name": "家鄉變成二次元" }, "music": { "status": 1, "id": 6855476868364193000, "mid": "6855476868364192519", "cover_hd": { "url_list": [ "https://p26-dy.byteimg.com/aweme/1080x1080/317ca0000ef155aeac0be.jpeg?from=4010531038", "https://p6-dy-ipv6.byteimg.com/aweme/1080x1080/317ca0000ef155aeac0be.jpeg?from=4010531038", "https://p3-dy-ipv6.byteimg.com/aweme/1080x1080/317ca0000ef155aeac0be.jpeg?from=4010531038" ], "uri": "317ca0000ef155aeac0be" }, "cover_large": { "url_list": [ "https://p26-dy.byteimg.com/aweme/1080x1080/317ca0000ef155aeac0be.jpeg?from=4010531038", "https://p6-dy-ipv6.byteimg.com/aweme/1080x1080/317ca0000ef155aeac0be.jpeg?from=4010531038", "https://p3-dy-ipv6.byteimg.com/aweme/1080x1080/317ca0000ef155aeac0be.jpeg?from=4010531038" ], "uri": "317ca0000ef155aeac0be" }, "play_url": { "uri": "http://p9-dy.byteimg.com/obj/ies-music/6855476835380480781.mp3", "url_list": [ "http://p9-dy.byteimg.com/obj/ies-music/6855476835380480781.mp3", "http://p1-dy.byteimg.com/obj/ies-music/6855476835380480781.mp3" ] }, "duration": 135, "position": null, "title": "@不自由畫師團糰子創作的原聲", "author": "不自由畫師團糰子", "cover_medium": { "uri": "317ca0000ef155aeac0be", "url_list": [ "https://p29-dy.byteimg.com/aweme/720x720/317ca0000ef155aeac0be.jpeg?from=4010531038", "https://p1-dy-ipv6.byteimg.com/aweme/720x720/317ca0000ef155aeac0be.jpeg?from=4010531038", "https://p9-dy.byteimg.com/aweme/720x720/317ca0000ef155aeac0be.jpeg?from=4010531038" ] }, "cover_thumb": { "uri": "317ca0000ef155aeac0be", "url_list": [ "https://p3-dy-ipv6.byteimg.com/aweme/100x100/317ca0000ef155aeac0be.jpeg?from=4010531038", "https://p9-dy.byteimg.com/aweme/100x100/317ca0000ef155aeac0be.jpeg?from=4010531038", "https://p29-dy.byteimg.com/aweme/100x100/317ca0000ef155aeac0be.jpeg?from=4010531038" ] } }, "author_user_id": 71884871098, "share_info": { "share_weibo_desc": "#在抖音，記錄美好生活#聽說集齊碎片可以召喚神龍！#家鄉變成二次元 #充能計劃 #畫畫 #夏日打卡挑戰", "share_desc": "在抖音，記錄美好生活", "share_title": "聽說集齊碎片可以召喚神龍！#家鄉變成二次元 #充能計劃 #畫畫 #夏日打卡挑戰" }, "promotions": null, "is_preview": 0, "group_id": 6855476646057643000, "video": { "origin_cover": { "uri": "tos-cn-p-0015/ac5c4e77f7c441359a656c68c86926e4_1596165086", "url_list": [ "https://p3-dy-ipv6.byteimg.com/tos-cn-p-0015/ac5c4e77f7c441359a656c68c86926e4_1596165086~tplv-dy-360p.jpeg?from=2563711402", "https://p6-dy-ipv6.byteimg.com/tos-cn-p-0015/ac5c4e77f7c441359a656c68c86926e4_1596165086~tplv-dy-360p.jpeg?from=2563711402", "https://p26-dy.byteimg.com/tos-cn-p-0015/ac5c4e77f7c441359a656c68c86926e4_1596165086~tplv-dy-360p.jpeg?from=2563711402" ] }, "ratio": "540p", "has_watermark": true, "bit_rate": null, "duration": 135302, "is_long_video": 1, "width": 720, "cover": { "uri": "tos-cn-p-0015/b98b9cb496be4379bcb8e283f38f1c9e", "url_list": [ "https://p6-dy-ipv6.byteimg.com/img/tos-cn-p-0015/b98b9cb496be4379bcb8e283f38f1c9e~c5_300x400.jpeg?from=2563711402_large", "https://p3-dy-ipv6.byteimg.com/img/tos-cn-p-0015/b98b9cb496be4379bcb8e283f38f1c9e~c5_300x400.jpeg?from=2563711402_large", "https://p9-dy.byteimg.com/img/tos-cn-p-0015/b98b9cb496be4379bcb8e283f38f1c9e~c5_300x400.jpeg?from=2563711402_large" ] }, "height": 1280, "dynamic_cover": { "url_list": [ "https://p3-dy-ipv6.byteimg.com/obj/tos-cn-p-0015/11e5f3dcb62749a6848a14c01c556f66_1596165086?from=2563711402_large", "https://p29-dy.byteimg.com/obj/tos-cn-p-0015/11e5f3dcb62749a6848a14c01c556f66_1596165086?from=2563711402_large", "https://p9-dy.byteimg.com/obj/tos-cn-p-0015/11e5f3dcb62749a6848a14c01c556f66_1596165086?from=2563711402_large" ], "uri": "tos-cn-p-0015/11e5f3dcb62749a6848a14c01c556f66_1596165086" }, "vid": "v0200fda0000bshokcp94bbr1103bot0", "play_addr": { "uri": "v0200fda0000bshokcp94bbr1103bot0", "url_list": [ "https://aweme.snssdk.com/aweme/v1/playwm/?video_id=v0200fda0000bshokcp94bbr1103bot0&ratio=720p&line=0" ] } }, "share_url": "https://www.iesdouyin.com/share/video/6855476646057643272/?region=&mid=6855476868364192519&u_code=48&titleType=title", "aweme_type": 4, "image_infos": null, "geofencing": null, "is_live_replay": false, "create_time": 1596165084, "duration": 135302, "comment_list": null, "cha_list": [ { "is_commerce": false, "cid": "1670532508858382", "desc": "", "connect_music": null, "view_count": 0, "hash_tag_profile": "", "cha_name": "家鄉變成二次元", "user_count": 0, "type": 1 } ], "risk_infos": { "warn": false, "type": 0, "content": "" }, "text_extra": [ { "hashtag_id": 1670532508858382, "start": 13, "end": 21, "type": 1, "hashtag_name": "家鄉變成二次元" }, { "start": 22, "end": 27, "type": 1, "hashtag_name": "充能計劃", "hashtag_id": 1655868948754440 }, { "start": 28, "end": 31, "type": 1, "hashtag_name": "畫畫", "hashtag_id": 1553508302124033 }, { "start": 32, "end": 39, "type": 1, "hashtag_name": "夏日打卡挑戰", "hashtag_id": 1673117213997070 } ], "author": { "policy_version": null, "uid": "71884871098", "short_id": "612124342", "signature": "沉迷二次元無法自拔的小姐姐（老阿姨）\n面對骨感的現實，依然滿懷希望的走在實現夢想的路上\n————漸行漸遠……（畫風越來越不對了…）", "avatar_thumb": { "uri": "317ca0000ef155aeac0be", "url_list": [ "https://p3-dy-ipv6.byteimg.com/aweme/100x100/317ca0000ef155aeac0be.jpeg?from=4010531038", "https://p9-dy.byteimg.com/aweme/100x100/317ca0000ef155aeac0be.jpeg?from=4010531038", "https://p29-dy.byteimg.com/aweme/100x100/317ca0000ef155aeac0be.jpeg?from=4010531038" ] }, "unique_id": "", "platform_sync_info": null, "nickname": "不自由畫師團糰子", "avatar_larger": { "uri": "317ca0000ef155aeac0be", "url_list": [ "https://p1-dy-ipv6.byteimg.com/aweme/1080x1080/317ca0000ef155aeac0be.jpeg?from=4010531038", "https://p9-dy.byteimg.com/aweme/1080x1080/317ca0000ef155aeac0be.jpeg?from=4010531038", "https://p6-dy-ipv6.byteimg.com/aweme/1080x1080/317ca0000ef155aeac0be.jpeg?from=4010531038" ] }, "avatar_medium": { "uri": "317ca0000ef155aeac0be", "url_list": [ "https://p6-dy-ipv6.byteimg.com/aweme/720x720/317ca0000ef155aeac0be.jpeg?from=4010531038", "https://p29-dy.byteimg.com/aweme/720x720/317ca0000ef155aeac0be.jpeg?from=4010531038", "https://p3-dy-ipv6.byteimg.com/aweme/720x720/317ca0000ef155aeac0be.jpeg?from=4010531038" ] }, "followers_detail": null, "geofencing": null, "type_label": null }, "statistics": { "aweme_id": "6855476646057643272", "comment_count": 6598, "digg_count": 74803, "play_count": 0 } } ], "ab_type": 1 } ``` 資訊還是蠻豐富的，作者資訊、視訊資訊、音樂資訊、封面資訊等一應俱全，視訊的地址是在item_list下video.play_addr.url_list中，複製下這個地址用瀏覽器訪問一下果然得到了視訊：  不過這個視訊還是帶水印的，如何獲得沒有水印的視訊呢，來看看從json字串中得到的視訊地址： > https://aweme.snssdk.com/aweme/v1/playwm/?video_id=v0200fda0000bshokcp94bbr1103bot0&ratio=720p&line=0 覺不覺得這個playwm中的wm是water mask的簡寫呢，把wm刪掉再訪問一下試試。即： > https://aweme.snssdk.com/aweme/v1/play/?video_id=v0200fda0000bshokcp94bbr1103bot0&ratio=720p&line=0 結果一片空白，是不是這樣行不通呢，不應該啊，不然直接寫play多好，何必又搞個playwm呢，一定是訪問姿勢有問題，點選左上角的裝置切換按鈕切換到移動端訪問一下，哇，amazing，竟然真的訪問到了！  同時可以看到原本左上角的抖音水印消失了。成功！ ## 思路總結 1. 訪問客戶端分享文字中的連結，從重定向後的url中提取視訊id，`https://www.iesdouyin.com/share/video/`後的數字就是視訊id。 2. 訪問`https://www.iesdouyin.com/web/api/v2/aweme/iteminfo/?item_ids=視訊id`獲取有關該視訊的json字串。 3. 從得到的json字串中提取視訊播放地址，在item_list下video.play_addr.url_list中。 4. 將視訊地址中的playwm替換為play。 5. 使用移動端的user-agent訪問替換後的視訊地址即可得到無抖音水印的視訊。 > 個人已使用node.js寫了一個抖音無水印視訊的解析庫，併發布在了npm和github上，詳情請訪問： > > npm:https://www.npmjs.com/package/douyin_video > > github:https://github.com/xyz-studio/Douyi