缩略图上载YouTube API v3失败

我们发现了这个问题，如果您不想使用库，以下是您必须遵循的步骤。

1） 岗位https://www.googleapis.com/upload/youtube/v3/thumbnails/set?videoId=VIDEO_ID&uploadType=可恢复带有一个空体

2） 返回响应的Location:标头中的URL，并使用Content-Type:images/png和正文中的缩略图POST到该URL

URL将被修复。

您还需要在频道中拥有特定权限才能设置自定义缩略图。

在我们的示例代码中有PHP和Python的例子。

这是我刚刚编写和测试的Java版本，它很有效。

/*
 * Copyright (c) 2013 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.api.services.samples.youtube.cmdline.youtube_cmdline_uploadthumbnail_sample;
import com.google.api.client.auth.oauth2.Credential;
import com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp;
import com.google.api.client.extensions.java6.auth.oauth2.FileCredentialStore;
import com.google.api.client.extensions.jetty.auth.oauth2.LocalServerReceiver;
import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow;
import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets;
import com.google.api.client.googleapis.json.GoogleJsonResponseException;
import com.google.api.client.googleapis.media.MediaHttpUploader;
import com.google.api.client.googleapis.media.MediaHttpUploaderProgressListener;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.http.InputStreamContent;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.services.youtube.YouTube;
import com.google.api.services.youtube.YouTube.Thumbnails.Set;
import com.google.api.services.youtube.model.ThumbnailSetResponse;
import com.google.common.collect.Lists;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.List;
/**
 * This sample uploads and sets a custom thumbnail for a video by:
 *
 *  1. Uploading a image utilizing "MediaHttpUploader" 2. Setting the uploaded image as a custom
 * thumbnail to the video via "youtube.thumbnails.set" method
 *
 * @author Ibrahim Ulukaya
 */
public class UploadThumbnail {
  /**
   * Global instance of the HTTP transport.
   */
  private static final HttpTransport HTTP_TRANSPORT = new NetHttpTransport();
  /**
   * Global instance of the JSON factory.
   */
  private static final JsonFactory JSON_FACTORY = new JacksonFactory();
  /**
   * Global instance of Youtube object to make all API requests.
   */
  private static YouTube youtube;
  /* Global instance of the format used for the image being uploaded (MIME type). */
  private static String IMAGE_FILE_FORMAT = "image/png";

  /**
   * Authorizes the installed application to access user's protected data.
   *
   * @param scopes list of scopes needed to run youtube upload.
   */
  private static Credential authorize(List<String> scopes) throws IOException {
    // Load client secrets.
    GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY,
        new InputStreamReader(UploadThumbnail.class.getResourceAsStream("/client_secrets.json")));
    // Checks that the defaults have been replaced (Default = "Enter X here").
    if (clientSecrets.getDetails().getClientId().startsWith("Enter")
        || clientSecrets.getDetails().getClientSecret().startsWith("Enter ")) {
      System.out.println(
          "Enter Client ID and Secret from https://code.google.com/apis/console/?api=youtube"
          + "into youtube-cmdline-uploadthumbnail-sample/src/main/resources/client_secrets.json");
      System.exit(1);
    }
    // Set up file credential store.
    FileCredentialStore credentialStore = new FileCredentialStore(
        new File(System.getProperty("user.home"), ".credentials/youtube-api-uploadthumbnail.json"),
        JSON_FACTORY);
    // Set up authorization code flow.
    GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
        HTTP_TRANSPORT, JSON_FACTORY, clientSecrets, scopes).setCredentialStore(credentialStore)
        .build();
    // Build the local server and bind it to port 8080
    LocalServerReceiver localReceiver = new LocalServerReceiver.Builder().setPort(8080).build();
    // Authorize.
    return new AuthorizationCodeInstalledApp(flow, localReceiver).authorize("user");
  }
  /**
   * This is a very simple code sample that looks up a user's channel, then features the most
   * recently uploaded video in the bottom left hand corner of every single video in the channel.
   *
   * @param args command line args (not used).
   */
  public static void main(String[] args) {
    // An OAuth 2 access scope that allows for full read/write access.
    List<String> scopes = Lists.newArrayList("https://www.googleapis.com/auth/youtube");
    try {
      // Authorization.
      Credential credential = authorize(scopes);
      // YouTube object used to make all API requests.
      youtube = new YouTube.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential).setApplicationName(
          "youtube-cmdline-addfeaturedvideo-sample").build();
      // Get the user selected video Id.
      String videoId = getVideoIdFromUser();
      System.out.println("You chose " + videoId + " to upload a thumbnail.");
      // Get the user selected local image file to upload.
      File imageFile = getImageFromUser();
      System.out.println("You chose " + imageFile + " to upload.");
      InputStreamContent mediaContent = new InputStreamContent(
          IMAGE_FILE_FORMAT, new BufferedInputStream(new FileInputStream(imageFile)));
      mediaContent.setLength(imageFile.length());
      // Create a request to set the selected mediaContent as the thumbnail of the selected video.
      Set thumbnailSet = youtube.thumbnails().set(videoId, mediaContent);
      // Set the upload type and add event listener.
      MediaHttpUploader uploader = thumbnailSet.getMediaHttpUploader();
      /*
       * Sets whether direct media upload is enabled or disabled. True = whole media content is
       * uploaded in a single request. False (default) = resumable media upload protocol to upload
       * in data chunks.
       */
      uploader.setDirectUploadEnabled(false);
      MediaHttpUploaderProgressListener progressListener = new MediaHttpUploaderProgressListener() {
        @Override
        public void progressChanged(MediaHttpUploader uploader) throws IOException {
          switch (uploader.getUploadState()) {
            case INITIATION_STARTED:
              System.out.println("Initiation Started");
              break;
            case INITIATION_COMPLETE:
              System.out.println("Initiation Completed");
              break;
            case MEDIA_IN_PROGRESS:
              System.out.println("Upload in progress");
              System.out.println("Upload percentage: " + uploader.getProgress());
              break;
            case MEDIA_COMPLETE:
              System.out.println("Upload Completed!");
              break;
            case NOT_STARTED:
              System.out.println("Upload Not Started!");
              break;
          }
        }
      };
      uploader.setProgressListener(progressListener);
      // Execute upload and set thumbnail.
      ThumbnailSetResponse setResponse = thumbnailSet.execute();
      // Print out returned results.
      System.out.println("n================== Uploaded Thumbnail ==================n");
      System.out.println("  - Url: " + setResponse.getItems().get(0).getDefault().getUrl());
    } catch (GoogleJsonResponseException e) {
      System.err.println("GoogleJsonResponseException code: " + e.getDetails().getCode() + " : "
          + e.getDetails().getMessage());
      e.printStackTrace();
    } catch (IOException e) {
      System.err.println("IOException: " + e.getMessage());
      e.printStackTrace();
    }
  }
  /*
   * Prompts for a video ID from standard input and returns it.
   */
  private static String getVideoIdFromUser() throws IOException {
    String title = "";
    System.out.print("Please enter a video Id to update: ");
    BufferedReader bReader = new BufferedReader(new InputStreamReader(System.in));
    title = bReader.readLine();
    if (title.length() < 1) {
      // If nothing is entered, exits
      System.out.print("Video Id can't be empty!");
      System.exit(1);
    }
    return title;
  }
  /*
   * Prompts for the path of the image file to upload from standard input and returns it.
   */
  private static File getImageFromUser() throws IOException {
    String path = "";
    System.out.print("Please enter the path of the image file to upload: ");
    BufferedReader bReader = new BufferedReader(new InputStreamReader(System.in));
    path = bReader.readLine();
    if (path.length() < 1) {
      // If nothing is entered, exits
      System.out.print("Path can not be empty!");
      System.exit(1);
    }
    return new File(path);
  }
}

给出的答案甚至都不接近正确！如果你在正文中没有图像的情况下发布到这个URL：

https://www.googleapis.com/upload/youtube/v3/thumbnails/set?videoId=VIDEO_ID&uploadType=可恢复

您将收到以下错误：

"400:mediaBodyRequired"

此页面底部的YouTube文档中描述了此错误：

https://developers.google.com/youtube/v3/docs/thumbnails/set

作为：

"请求不包括图像内容。"

尽管他们的文档遗漏了很多内容（想想categoryId），但由于我刚刚尝试了Ibrahim发布的第一个解决方案并收到了错误，所以他们在这里已经死了。尽管他表示不提供体内的图像数据，但文件和我自己的研究表明恰恰相反。

解决方案是发布到这个URL，包括图片正文。在这样做的时候，我收到了这样的回复：

｛"kind"："youtube#thumbnailSetResponse"，"etag"："\"kYnGHzMaBhcGeLrcKRx6PAIUosY/lcDPfygjJkG-yyyzdBp0dKhY2xMY\"，"items"：[｛"default"：｛"url"："//i.ytimg.com/vi/fyBx3v1gmbM/default.jpg"，"width"：120，"height"：90｝，"medium"：｛width"：320，"height"：180｝，"high"：｛"url"："//i.ytimg.com/vi/fyBx3v1gmbM/hqdefault.jpg"，"width":480，"height"：360｝，"standard"：｛

不幸的是，它实际上并没有改变缩略图，但我认为这是他们的API服务器和缩略图处理排队的问题。不过，它确实返回了一个成功的响应。不知道为什么缩略图没有改变。