一:blob下载问题的详细描述
我想用
src url blob:https%3A//www.youtube.com/23aea5c8-9ae2-40dc-9417-e675ea99b386
下载视频,但是不知道应该怎么做。
有没有下载这类视频的通用方法?
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我在Vimeo
中找到了一个使用blob url
下载视频的方法(读了这篇文章,我才知道做法)。我正在使用Google Chrome,具体步骤如下:
- 打开
More Tools
(更多工具)→Developer Tools
(开发工具)- 检查视频标签中是否有这样的东西:
```- 复制iframe标签的src(如果有的话)值,如
http://player.vimeo.com/video/XYZ
,如果你发现它可以复制,直接跳到第7点,否则按照步骤4,5,6继续操作。- 现在在页面中找到这个字符串
https://skyfire.vimeocdn.com/.../master.json?base64_init=1
(使用开发视图(Developer View)),应该可以在javascript函数中找到它,像这样:(function(e,a){var t={"cdn_url":"https://f.vimeocdn.com","view":1,"request":{"files":{"dash":{"origin":"gcs","url":"https://48skyfiregce-a.akamaihd.net/.../master.json?base64_init=1","cdn":"
- 复制上面的url字段中的链接到一个新的Chrome选项卡,例如
https://48skyfiregce-a.akamaihd.net/.../master.json?base64_init=1
,然后使用浏览器打开它,它会打开一个像这样的json文件:{ "clip_id": XYZ, "base_url": "../", "video": [ { ... ... ...
- 现在用id XYZ组合构造一个URL,如下所示:
https://player.vimeo.com/video/XYZ
- 用最终的URL替换视频标签内的
blob:https://player.vimeo.com/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
(在上一步#6中创建的)。- 现在可以发现,魔术般地,视频标签内的src字段已更改(如果没有,请尝试第7步多次)...
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这个答案是针对Twitter网址的
复制上面的代码,并粘贴到记事本++(Notepad++)中,然后用"替换所有的"
,用/
替换所有和\/
。 (使用CTRL + H
)
你会得到如下的内容:
{
"is_360": false,
"duration": 28617,
"scribe_widget_origin": true,
"heartbeatEnabled": true,
"video_url": "https://video.twimg.com/ext_tw_video/844504104512749568/pu/pl/e91Du5N2TZ09ZaW_.m3u8",
"disable_embed": "0",
"videoInfo": {
"title": null,
"description": null,
"publisher": {
"screen_name": "MountainButorac",
"name": "Mountain Butorac",
"profile_image_url": "https://pbs.twimg.com/profile_images/808318456701521920/vBvlAASx_normal.jpg"
}
},
"cardUrl": "https://t.co/SdSorop3uN",
"content_type": "application/x-mpegURL",
"owner_id": "14120461",
"looping_enabled": true,
"show_cookie_override_en": true,
"visit_cta_url": null,
"scribe_playlist_url": "https://twitter.com/MountainButorac/status/844505243538931714/video/1",
"source_type": "consumer",
"image_src": "https://pbs.twimg.com/ext_tw_video_thumb/844504104512749568/pu/img/FFt3qkbeOh0RlGfZ.jpg",
"heartbeatIntervalInMs": 5000.0,
"use_tfw_live_heartbeat_event_category": true,
"video_loading_timeout": 45000.0,
"status": {
"created_at": "Wed Mar 22 11:05:14 +0000 2017",
"id": 844505243538931714,
"id_str": "844505243538931714",
"text": "Took my Goddaughter to meet the pope. She stole his hat! https://t.co/SdSorop3uN",
"truncated": false,
"entities": {
"hashtags": [],
"symbols": [],
"user_mentions": [],
"urls": [],
"media": [{
"id": 844504104512749568,
"id_str": "844504104512749568",
"indices": [57, 80],
"media_url": "http://pbs.twimg.com/ext_tw_video_thumb/844504104512749568/pu/img/FFt3qkbeOh0RlGfZ.jpg",
"media_url_https": "https://pbs.twimg.com/ext_tw_video_thumb/844504104512749568/pu/img/FFt3qkbeOh0RlGfZ.jpg",
"url": "https://t.co/SdSorop3uN",
"display_url": "pic.twitter.com/SdSorop3uN",
"expanded_url": "https://twitter.com/MountainButorac/status/844505243538931714/video/1",
"type": "photo",
"sizes": {
"small": {
"w": 340,
"h": 604,
"resize": "fit"
},
"thumb": {
"w": 150,
"h": 150,
"resize": "crop"
},
"large": {
"w": 576,
"h": 1024,
"resize": "fit"
},
"medium": {
"w": 576,
"h": 1024,
"resize": "fit"
}
}
}]
},
"source": "\u003ca href=\"http://twitter.com/download/iphone\" rel=\"nofollow\"\u003eTwitter for iPhone\u003c/a\u003e",
"in_reply_to_status_id": null,
"in_reply_to_status_id_str": null,
"in_reply_to_user_id": null,
"in_reply_to_user_id_str": null,
"in_reply_to_screen_name": null,
"geo": null,
"coordinates": null,
"place": null,
"contributors": null,
"retweet_count": 0,
"favorite_count": 0,
"favorited": false,
"retweeted": false,
"possibly_sensitive": false,
"lang": "en"
},
"show_cookie_override_all": true,
"video_session_enabled": false,
"media_id": "844504104512749568",
"view_counts": null,
"statusTimestamp": {
"local": "4:05 AM - 22 Mar 2017"
},
"media_type": 1,
"user": {
"screen_name": "MountainButorac",
"name": "Mountain Butorac",
"profile_image_url": "https://pbs.twimg.com/profile_images/808318456701521920/vBvlAASx_bigger.jpg"
},
"watch_now_cta_url": null,
"tweet_id": "844505243538931714"
}
从上面的JSON格式,可以看到video_url的值:
https://video.twimg.com/ext_tw_video/844504104512749568/pu/pl/e91Du5N2TZ09ZaW_.m3u8
这里的问题是,在2016年8月1日之后,Twitter不再使用.mp4视频,而是转换为新的HLS,自适应流格式,带有.m3u8文件扩展名。
.m3u8文件基本上只是一个文本文的封装,它们非常小(300-500字节)。当您使用文本编辑器打开它们时,它们包含指向不同视频大小的链接
- 在记事本++(Notepad++)中打开文件m3u8,它会包含这样的代码:
EXTM3U EXT-X-INDEPENDENT-SEGMENTS EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=256000,RESOLUTION=180x320,CODECS="mp4a.40.2,avc1.42001f"/ext_tw_video/844504104512749568/pu/pl/180x320/_Z42SY5zwMlLdFYx.m3u8 EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=832000,RESOLUTION=360x640,CODECS="mp4a.40.2,avc1.42001f"/ext_tw_video/844504104512749568/pu/pl/360x640/-Phfjbbx2yinirLi.m3u8
- 根据您需要的分辨率从上面复制对应的链接。重复相同的步骤,直到有
.ts
文件。下载.ts
文件(视频文件)。