base on Dart library to interact with many Youtube APIs # YoutubeExplodeDart This is a port of the [YoutubeExplode] library from C#, most of the functions, doc comments, readme information, is taken from YoutubeExplode repository.    It used to build [Youtube Downloader Flutter](https://github.com/Hexer10/youtube_downloader_flutter) (A cross-platform application to download video streams from youtube using this library & flutter) --- YoutubeExplode is a library that provides an interface to query metadata of YouTube videos, playlists and channels, as well as to resolve and download video streams and closed caption tracks. Behind a layer of abstraction, the library parses raw page content and uses reverse-engineered AJAX requests to retrieve information. As it doesn't use the official API, there's also no need for an API key and there are no usage quotas. ## Features - Retrieve metadata on videos, playlists, channels, streams, and closed captions - Execute search queries and get resulting videos. - Get or download video streams. - Get closed captions. - Get video comments. ## Usage - [Install](#install) - [Downloading a video stream](#downloading-a-video-stream) - [Working with playlists](#working-with-playlists) - [Extracting closed captions](#extracting-closed-captions) - [Getting comments](#get-comments) - [Cleanup](#cleanup) - [Before reporting an issue](#troubleshooting) ### Install Add the dependency to the pubspec.yaml (Check for the latest version) ```yaml youtube_explode_dart: ^2.3.4 ``` Import the library ```dart import 'package:youtube_explode_dart/youtube_explode_dart.dart'; ``` ### Getting metadata of a video The following example shows how you can extract various metadata from a YouTube video: ```dart // You can provide either a video ID or URL as String or an instance of `VideoId`. var video = yt.videos.get('https://youtube.com/watch?v=Dpp1sIL1m5Q'); // Returns a Video instance. var title = video.title; // "Scamazon Prime" var author = video.author; // "Jim Browning" var duration = video.duration; // Instance of Duration - 0:19:48.00000 ``` ### Downloading a video stream Every YouTube video has a number of streams available. These streams may have different containers, video quality, bitrate, etc. On top of that, depending on the content of the stream, the streams are further divided into 3 categories: - Muxed streams -- contain both video and audio (available only in 360p) - Audio-only streams -- contain only audio - Video-only streams -- contain only video You can request the stream manifest to get available streams for a particular video: ```dart var yt = YoutubeExplode(); var manifest = yt.videos.streams.getManifest('Dpp1sIL1m5Q'); print(manifest); // Prints the list of streams available for the video. // If you want to specify which youtube clients to use to get the manifest you can do so: var manifest = yt.videos.streams.getManifest(videoId, ytClients: [ YoutubeApiClient.safari, YoutubeApiClient.androidVr ]); // The streams provided by both clients will be merged. ``` Once you get the manifest, you can filter through the streams and choose the one you're interested in downloading: ```dart // highest bitrate audio-only stream var streamInfo = streamManifest.audioOnly.withHigestBitrate(); // MP4 video-only stream var streamInfo.videoOnly.where((e) => e.container == Container); // Muxed (audio + video) stream with the highest video quality. NOTE: Don't rely on this, muxed streams are limited to 360p30. var streamInfo = streamManifest.muxed.withHigestVideoQuality(); // HLS (m3u8) streams are also supported var streamInfo = streamManifest.hls; ``` Finally, you can get the actual `Stream` object represented by the metadata: ```dart // Get the actual byte stream var stream = yt.video.streams.get(streamInfo); // Open a file for writing. var file = File(filePath); var fileStream = file.openWrite(); // Pipe all the content of the stream into the file. await stream.pipe(fileStream); // Close the file. await fileStream.flush(); await fileStream.close(); ``` While it may be tempting to just always use muxed streams, it's important to note that they are limited in quality. **Muxed streams don't go beyond 360p30.** If you want to download the video in maximum quality, you need to download the audio-only and video-only streams separately and then mux them together on your own. There are tools like FFmpeg that let you do that. ### Working with playlists Among other things, YoutubeExplode also supports playlists: ```dart var yt = YoutubeExplode(); // Get playlist metadata. var playlist = await yt.playlists.get('xxxxx'); var title = playlist.title; var author = playlist.author; await for (var video in yt.playlists.getVideos(playlist.id)) { var videoTitle = video.title; var videoAuthor = video.author; } var playlistVideos = await yt.playlists.getVideos(playlist.id); // Get first 20 playlist videos. var somePlaylistVideos = await yt.playlists.getVideos(playlist.id).take(20); ``` ### Extracting closed captions Similarly, to streams, you can extract closed captions by getting the manifest and choosing the track you're interested in: ```dart var yt = YoutubeExplode(); var trackManifest = await yt.videos.closedCaptions.getManifest('_QdPW8JrYzQ') var trackInfo = manifest.getByLanguage('en'); // Get english caption. if (trackInfo != null) { // Get the actual closed caption track. var track = await youtube.videos.closedCaptions.get(trackInfo); // Get the caption displayed at 1:01 var caption = track.getByTime(Duration(seconds: 61)); var text = caption?.text; // "And the game was afoot." } ``` #### Get a list of related videos ```dart var video = yt.videos.get('https://youtube.com/watch?v=Dpp1sIL1m5Q'); var relatedVideos = await yt.videos.getRelatedVideos(video); // video must be a Video instance. print(relatedVideos); //prints the list of related videos // to get the next page of related videos relatedVideos = await relatedVideos.nextPage(); ``` If no related video is found `getRelatedVideos` or `nextPage` will return null. ### Get comments You can easily get the video comments of a given video, the return value of `comments.getComments(video)` is a list-like object which behaves exactly like a `List` but has an additional method `nextPage()` which is used in order to get the next comments, it returns null when there are no comments to be fetched anymore. ```dart var comments = await yt.videos.comments.getComments(video); var replies = await yt.videos.comments.getReplies(comment); // Fetch the comment replies ``` ### Cleanup You need to close `YoutubeExplode`'s http client, when done otherwise this could halt the dart process. ```dart yt.close(); ``` ### Troubleshooting If you encounter any issues, please check that it has not been reported already in the [issues section](Issue). When reporting a new issue, make sure to follow the issue template and report the logs after having enabled the logging: ```dart import 'package:logging/logging.dart'; ... // Before any YoutubeExplode code Logger.root.level = Level.FINER; Logger.root.onRecord.listen((e) { print(e); if (e.error != null) { print(e.error); print(e.stackTrace); } }); ``` To the very minimum the video id causing the issue (if applicable) and the code snippet that is causing the issue must be provided. ### Examples: More examples available on [GitHub][Examples]. --- Check the [api documentation][API] for additional information. You can find how most APIs can be used in the files inside the test/ folder. ### Credits - [Tyrrrz] for creating [YoutubeExplode] in C# - [Hexer10] (me) who ported the library over to Dart. - [EnsembleUI] for the jsparser project. - [yt-dlp] for documentation and reverse engineering about the YouTube apis. - All the [Contributors] of this repository. [YoutubeExplode]: https://github.com/Tyrrrz/YoutubeExplode/ [API]: https://pub.dev/documentation/youtube_explode_dart/latest/youtube_explode/youtube_explode-library.html [Examples]: https://github.com/Hexer10/youtube_explode_dart/tree/master/example [Tyrrrz]: https://github.com/Tyrrrz/ [Hexer10]: https://github.com/Hexer10/ [Contributors]: https://github.com/Hexer10/youtube_explode_dart/graphs/contributors [EnsembleUI]: https://github.com/EnsembleUI [Issue]: https://github.com/Hexer10/youtube_explode_dart/issues [yt-dlp]: https://github.com/yt-dlp/yt-dlp ", Assign "at most 3 tags" to the expected json: {"id":"11838","tags":[]} "only from the tags list I provide: [{"id":77,"name":"3d"},{"id":89,"name":"agent"},{"id":17,"name":"ai"},{"id":54,"name":"algorithm"},{"id":24,"name":"api"},{"id":44,"name":"authentication"},{"id":3,"name":"aws"},{"id":27,"name":"backend"},{"id":60,"name":"benchmark"},{"id":72,"name":"best-practices"},{"id":39,"name":"bitcoin"},{"id":37,"name":"blockchain"},{"id":1,"name":"blog"},{"id":45,"name":"bundler"},{"id":58,"name":"cache"},{"id":21,"name":"chat"},{"id":49,"name":"cicd"},{"id":4,"name":"cli"},{"id":64,"name":"cloud-native"},{"id":48,"name":"cms"},{"id":61,"name":"compiler"},{"id":68,"name":"containerization"},{"id":92,"name":"crm"},{"id":34,"name":"data"},{"id":47,"name":"database"},{"id":8,"name":"declarative-gui "},{"id":9,"name":"deploy-tool"},{"id":53,"name":"desktop-app"},{"id":6,"name":"dev-exp-lib"},{"id":59,"name":"dev-tool"},{"id":13,"name":"ecommerce"},{"id":26,"name":"editor"},{"id":66,"name":"emulator"},{"id":62,"name":"filesystem"},{"id":80,"name":"finance"},{"id":15,"name":"firmware"},{"id":73,"name":"for-fun"},{"id":2,"name":"framework"},{"id":11,"name":"frontend"},{"id":22,"name":"game"},{"id":81,"name":"game-engine "},{"id":23,"name":"graphql"},{"id":84,"name":"gui"},{"id":91,"name":"http"},{"id":5,"name":"http-client"},{"id":51,"name":"iac"},{"id":30,"name":"ide"},{"id":78,"name":"iot"},{"id":40,"name":"json"},{"id":83,"name":"julian"},{"id":38,"name":"k8s"},{"id":31,"name":"language"},{"id":10,"name":"learning-resource"},{"id":33,"name":"lib"},{"id":41,"name":"linter"},{"id":28,"name":"lms"},{"id":16,"name":"logging"},{"id":76,"name":"low-code"},{"id":90,"name":"message-queue"},{"id":42,"name":"mobile-app"},{"id":18,"name":"monitoring"},{"id":36,"name":"networking"},{"id":7,"name":"node-version"},{"id":55,"name":"nosql"},{"id":57,"name":"observability"},{"id":46,"name":"orm"},{"id":52,"name":"os"},{"id":14,"name":"parser"},{"id":74,"name":"react"},{"id":82,"name":"real-time"},{"id":56,"name":"robot"},{"id":65,"name":"runtime"},{"id":32,"name":"sdk"},{"id":71,"name":"search"},{"id":63,"name":"secrets"},{"id":25,"name":"security"},{"id":85,"name":"server"},{"id":86,"name":"serverless"},{"id":70,"name":"storage"},{"id":75,"name":"system-design"},{"id":79,"name":"terminal"},{"id":29,"name":"testing"},{"id":12,"name":"ui"},{"id":50,"name":"ux"},{"id":88,"name":"video"},{"id":20,"name":"web-app"},{"id":35,"name":"web-server"},{"id":43,"name":"webassembly"},{"id":69,"name":"workflow"},{"id":87,"name":"yaml"}]" returns me the "expected json"