Tôi đang cố tải xuống video với url src blob:https%3A//www.youtube.com/23aea5c8-9ae2-40dc-9417-e675ea99b386.
Có một quy trình có thể được theo dõi để tải xuống tất cả các loại video này?
nguồn
Steps to Download Brightcove Video Firefox: Install or add Video Downloader Prime add-ons to Firefox. Play the Brightcove video you desire to download. Once Video Downloader Prime detects Brightcove video, the browser toolbar icon will display the number of captured videos. I have an odd problem, the function below is one I created based on what i found on the net about creating a Blob in the client on the fly with some binary data in (passed as an array) and being able to download that. This works brilliantly in Chrome, but doesn't do anything in Firefox - UNLESS I debug and step through the code. Download Firefox Register or log in. The Stream Detector by rowrawer. Detects playlists and subtitles used by HLS/DASH/HDS/MSS streams.
The Blob object represents a blob, which is a file-like object of immutable, raw data; they can be read as text or binary data, or converted into a ReadableStream so its methods can be used for processing the data.
Blobs can represent data that isn't necessarily in a JavaScript-native format. The File interface is based on Blob, inheriting blob functionality and expanding it to support files on the user's system.
Using blobs
To construct a Blob from other non-blob objects and data, use the Blob() constructor. To create a blob that contains a subset of another blob's data, use the slice() method. To obtain a Blob object for a file on the user's file system, see the File documentation.
The APIs accepting Blob objects are also listed in the File documentation.
Constructor
Blob()- Returns a newly created
Blobobject which contains a concatenation of all of the data in the array passed into the constructor.
Instance properties
Blob.prototype.sizeRead only- The size, in bytes, of the data contained in the
Blobobject. Blob.prototype.typeRead only- A string indicating the MIME type of the data contained in the
Blob. If the type is unknown, this string is empty.
Instance methods
Blob.prototype.arrayBuffer()- Returns a promise that resolves with an
ArrayBuffercontaining the entire contents of theBlobas binary data. Blob.prototype.slice()- Returns a new
Blobobject containing the data in the specified range of bytes of the blob on which it's called. Blob.prototype.stream()- Returns a
ReadableStreamthat can be used to read the contents of theBlob. Blob.prototype.text()- Returns a promise that resolves with a
USVStringcontaining the entire contents of theBlobinterpreted as UTF-8 text.
Examples
Creating a blob
The Blob() constructor can create blobs from other objects. For example, to construct a blob from a JSON string:
Creating a URL representing the contents of a typed array
The following code creates a JavaScript typed array and creates a new Blob containing the typed array's data. It then calls URL.createObjectURL() to convert the blob into a URL.
HTML
JavaScript
The main piece of this code for example purposes is the typedArrayToURL() function, which creates a Blob from the given typed array and returns an object URL for it. Having converted the data into an object URL, it can be used in a number of ways, including as the value of the <img> element's src attribute (assuming the data contains an image, of course).
Result
Click the link in the example to see the browser decode the object URL.
Extracting data from a blob
One way to read content from a Blob is to use a FileReader. The following code reads the content of a Blob as a typed array:
Another way to read content from a Blob is to use a Response. The following code reads the content of a Blob as text:
Or by using Blob.prototype.text():
By using other methods of FileReader, it is possible to read the contents of a Blob as a string or a data URL.
Specifications
| Specification | Status | Comment |
|---|---|---|
| File API The definition of 'The Blob interface' in that specification. | Working Draft | Initial definition. |
Browser compatibility
Blob Video Player
BCD tables only load in the browser
Download Blob Url
See also