YoutubeExplodeDart

This is a port of the YoutubeExplode library from C#, most of the API functions or doc comments come from YoutubeExplode's API.

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This library provides a class to query metadata of Youtube videos, playlists and channels. This doesn't require an API key and has no usage quotas.

Features from YoutubeExplode

• Retrieve info about videos, playlists, channels, media streams, closed caption tracks.
• Handles all types of videos, including legacy, signed, restricted, non-embeddable and unlisted videos
• Downloads videos by exposing their media content as a stream
• Parses and downloads closed caption tracks
• All metadata properties are exposed using strong types and enums
• Provides static methods to validate IDs and to parse IDs from URLs
• No need for an API key and no usage quotas
• All model extend Equatable to easily perform equality checks
• Download Stream

Features not implemented

• Adaptive streams

Differences from YoutubeExplode

• The entry point is YoutubeExplode, not YoutubeClient.
• The MediaStreamInfoSet class has a videoDetails class which contains info about the video metadata (to avoid making several api calls).
• The ClosedCaption has a end getter to get when a closed captions ends being displayed.

Install

Add the dependency to the pubspec.yaml (Check for the latest version)

youtube_explode_dart: ^0.0.9

Import the library

import 'package:youtube_explode_dart/youtube_explode_dart.dart';

Usage

To start using the API you need to initialize the YoutubeExplode class (which will create a new http client), and get (for example) the video id of the video you'd want to retrieve information, which usually is the v parameter.

var id = YoutubeExplode.parseVideoId('https://www.youtube.com/watch?v=OpQFFLBMEPI'); // Returns `OpQFFLBMEPI`

var yt = YoutubeExplode();

Get video metadata

The Video class contains info about the video such as the video title, the duration or the search keywords.

var video = yt.getVideo(id); // Returns a Video instance.

Get video mediaStream

The MediaStreamsInfoSet contains the audio, video and muxed streams of the video. Each of the streams provides an url which can be used to download a video with a get request (See example).

var mediaStreams = yt.getVideoMediaStream();

var muxed = mediaStreams.muxed; // List of `MuxedStreamInfo` sorted by video quality.
var audio = mediaStreams.audio; // List of `AudioStreamInfo` sorted by bitrate.
var video = mediaStreams.video; // List of `VideoSteamInfo` sorted by video quality.

var videoDetails = mediaStreams.videoDetails; //Returns a `Video` instance. Used to avoid calling `yt.getVideo`.

Be aware, the muxed streams don't hold the best quality, to achieve so, you'd need to merge the audio and video streams.

Closed Captions

To get the video closed caption it is need to query before the caption track infos, which can be used to retrieve the closed caption.

  var trackInfos = await yt.getVideoClosedCaptionTrackInfos(id); // Get the caption track infos
  if (trackInfos.isEmpty) {
    // No caption is available.
    return;
  }

  var enTrack = trackInfos.firstWhere(
      (e) => e.language.code == 'en'); // Find the english caption track.

  if (enTrack == null) {
    // The english track doesn't exist.
    return;
  }

  var captionTrack = await yt.getClosedCaptionTrack(enTrack); // Get the english closed caption track 
  var captions = captionTrack.captions; // List of ClosedCaption

  captions.first; // Get the first displayed caption.
  captions.getByTime(7); // Get the caption displayed at the 7th second.

Cleanup

You need to close YoutubeExplode's http client when done otherwise this could halt the dart process.

yt.close();

Examples:

Available on GitHub

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Check the api doc for additional information. More features are provided through extensions.