![]() ![]() It’s been a few days since you uploaded your video, you’re back in your Wistia account, and you want to pick a new thumbnail. ![]() Here’s where things take a turn for the worse. Great! Now you see the new thumbnail, and all this took only a second or two. The server with the video file receives the request and extracts the thumbnail immediately using ffmpeg.The Bakery checks and sees that the video file is stored locally on one of the nodes in the upload cluster, so it routes the request to the machine that has the video file.The Wistia application servers send a message to the Bakery’s API, instructing it to extract a frame from the video at the time you specified.In your Wistia account, you pause the video on the frame you want as your thumbnail, and you click “Use the current frame.” Here’s what happens when you click that link: Now, say you don’t like the thumbnail the system automatically chose for you, and you want to pick your own. Because the file is on the local filesystem, this is a quick operation: it usually takes less than a second. When the upload is complete, we extract a thumbnail from the middle of the video using ffmpeg, a popular open source project that provides tools to manipulate video. The upload gets routed to a cluster of Bakery upload servers at a Rackspace data center outside Chicago. The Bakery handles all of our video ingestion, transcoding, storage, and delivery. When you upload a video to Wistia, it’s sent to an internal service called the Bakery. To understand what’s happening behind the scenes, here’s a bit more context about our system’s architecture. The only problem is that there are cases where that “ta-da” isn’t quite a “ta-da.” Occasionally, it takes us several minutes to process the thumbnail change after you select it. You open up the Customize panel, seek to the frame you want in the video (for bonus points, use the arrow keys to single frame advance to the exact frame you want), then click Use the current frame, and ta-da: we grab that frame and set it as the video’s thumbnail. One handy feature of Wistia is the ability to easily set a video’s thumbnail (or still or poster, if you prefer) to an exact frame. ![]()
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