使用API​​在youtube中上传视频时未设置缩略图

Question

当我在youtube中上传视频时，我尝试使用不同的方法来设置缩略图，但是我没有获得任何成功，所以我现在被困住了。

 $videoPath = 'videos/dlrcodexow-file_example_MP4_480_1_5MG.mp4';
 $snippet = new Google_Service_YouTube_VideoSnippet();

 $thumbnailDetails = new Google_Service_YouTube_ThumbnailDetails();
 $thumbnail = new Google_Service_YouTube_Thumbnail();
 $thumbnail->setHeight(110);
 $thumbnail->setUrl('videos/test.png');
 $thumbnail->setWidth(90);
 $thumbnailDetails->setDefault($thumbnail);
 $snippet->setThumbnails($thumbnailDetails);

 $snippet->setTitle('hello');
 $snippet->setDescription('test video');
 $snippet->setTags(explode(",", 'test,test'));

 $snippet->setCategoryId("22");

 $status = new Google_Service_YouTube_VideoStatus();
 $status->privacyStatus = 'public';

 $video = new Google_Service_YouTube_Video();
 $video->setSnippet($snippet);

 $video->setStatus($status);

 $chunkSizeBytes = 1 * 1024 * 1024;
 $client->setDefer(true);

 $insertRequest = $youtube->videos->insert("status,snippet", $video);

 $media = new Google_Http_MediaFileUpload($client,$insertRequest,'video/*',null,true,$chunkSizeBytes);
 $media->setFileSize(filesize($videoPath)); 

 $status = false;
 $handle = fopen($videoPath, "rb");
 while (!$status && !feof($handle)) {
       $chunk = fread($handle, $chunkSizeBytes);
       $status = $media->nextChunk($chunk);
       }
       fclose($handle);

 $client->setDefer(false);

 $videoTitle = $status['snippet']['title'];
 $videoDesc = $status['snippet']['description'];
 $videoTags = implode(",",$status['snippet']['tags']);
 $videoId = $status['id'];

视频已正确上传到youtube频道，但未在缩略图中设置图片。