Custom Thumbnails youtube v3 ( 2 method )

 

 

I am facing a huge problem using the youtube-api. I try to set a custom thumbnail for one of my videos. Of course I have the permission to set custom thumbnails for my videos and an authenticated youtube service. I tried to do it in two ways (C#):

Method 1 using the .Net API:

    [...]
    Debug.WriteLine("Try to set thumbnail...");
    thumbnailStream = File.OpenRead(@"D:\myThumbnail.jpg");
    YouTubeService service = GetYouTubeService(); // Gets the authenticated youtube service
    ThumbnailsResource tr = new ThumbnailsResource(service);
    ThumbnailsResource.SetMediaUpload mediaUploadThumbnail = tr.Set(MY_VIDEO_ID, thumbnailStream, "image/jpeg");
    mediaUploadThumbnail.ChunkSize = 256 * 1024;
    mediaUploadThumbnail.ProgressChanged += mediaUploadThumbnail_ProgressChanged;
    mediaUploadThumbnail.ResponseReceived += mediaUploadThumbnail_ResponseReceived;
    Debug.WriteLine("... Starting async upload");
    mediaUploadThumbnail.UploadAsync();
    [...]

    void mediaUploadThumbnail_ProgressChanged(IUploadProgress obj)
    {
        Debug.WriteLine("... Progress changed");
        Debug.Write(" ... " + obj.Status.ToString() + ": " + obj.BytesSent + " bytes sent");
        if (obj.Exception != null)
        {
            Debug.Write("... Exception:" + obj.Exception.ToString());
            thumbnailStream.Close();
            uploadList[aktuelleUploadPosition].Status = UploadVideoStatus.ThumbnailFehler;
            objectListViewUploads.RefreshObjects(uploadList);
            Starte_Uploads();
        }
    }

    void mediaUploadThumbnail_ResponseReceived(ThumbnailSetResponse obj)
    {
        Debug.WriteLine("... Done: " + obj.Items[0].High.Url);
        thumbnailStream.Close();
        uploadList[aktuelleUploadPosition].Status = UploadVideoStatus.Fertig;
        objectListViewUploads.RefreshObjects(uploadList);
        Starte_Uploads();
    }

The Output of Method 1 is:

Try to set thumbnail...
... Starting async upload
... Progress changed ... Starting: 0 bytes sent
... Progress changed ... Uploading: 262144 bytes sent
... Progress changed ... Uploading: 524288 bytes sent
... Done: https://i.ytimg.com/s_vi/CjiPNurZs2M/hqdefault.jpg?sqp=CJCH958F&rs=AOn4CLA5OGm9ZfythL5cri4cjV3CyP4Pmg
... Progress changed ... Completed: 750441 bytes sent

Method 2 using direct Webrequest:

    Debug.WriteLine("Try to set thumbnail...");
    RefreshToken(); // sets a new access token or refreshes the existing on
    thumbnailStream = File.OpenRead(@"D:\myThumbnail.jpg");
    HttpWebRequest webReq = (HttpWebRequest)WebRequest.Create("https://www.googleapis.com/upload/youtube/v3/thumbnails/set?videoId=" + MY_VIDEO_ID);
    webReq.Method = "POST";
    webReq.ContentLength = thumbnailStream.Length;
    webReq.ContentType = "image/jpeg";
    webReq.Headers.Set(HttpRequestHeader.Authorization, "Bearer " + access_token);
    byte[] thumbBuffer = ReadToEnd(thumbnailStream);
    var reqStream = webReq.GetRequestStream();
    reqStream.Write(thumbBuffer, 0, thumbBuffer.Length);
    reqStream.Close();
    try
    {
        HttpWebResponse resp = (HttpWebResponse)webReq.GetResponse();
        byte[] bytes = new byte[(int)resp.ContentLength];
        resp.GetResponseStream().Read(bytes, 0, (int)resp.ContentLength);
        Debug.WriteLine("Content: " + System.Text.Encoding.UTF8.GetString(bytes));
    }
    catch (WebException ex)
    {
        byte[] bytes = new byte[(int)ex.Response.ContentLength];
        ex.Response.GetResponseStream().Read(bytes, 0, (int)ex.Response.ContentLength);
        Debug.WriteLine("Content: " + System.Text.Encoding.UTF8.GetString(bytes));
    }
    thumbnailStream.Close();

The Output of Method 2 is:

Try to set thumbnail...
Content: {
 "kind": "youtube#thumbnailSetResponse",
 "etag": "\"gMjDJfS6nsym0T-NKCXALC_u_rM/FktWbvFp7RSXY9xeTkZbzfsVtH0\"",
 "items": [
  {
   "default": {
    "url": "https://i.ytimg.com/s_vi/CjiPNurZs2M/default.jpg?sqp=CMCQ958F&rs=AOn4CLAr7zN45H1HExk4K_-y8ujYXWMBFw",
    "width": 120,
    "height": 90
   },
   "medium": {
    "url": "https://i.ytimg.com/s_vi/CjiPNurZs2M/mqdefault.jpg?sqp=CMCQ958F&rs=AOn4CLAJcATINZ2yuyNE1Ij6engYjZA5qw",
    "width": 320,
    "height": 180
   },
   "high": {
    "url": "https://i.ytimg.com/s_vi/CjiPNurZs2M/hqdefault.jpg?sqp=CMCQ958F&rs=AOn4CLBOJfds9D6hyIFDyeYzr9oug52-Lg",
    "width": 480,
    "height": 360
   }
  }
 ]
}

Result:

Both methods seem to be doing, what they are supposed to do. But if I check the images represented by the urls in the outputs, I see that they are the default “in progress image” (the one with the three dots) if no thumbnail for this video had been set before or the old thumbnail if it had been set before. The thumbnail shown for the video in my video manager is always the default “in progress image”. So no image is being set. I know that the image (D:\myThumbnail.jpg) is ok and can be set, because I can set it as a thumbnail in my video manager.