The Signed URL can be generated using Bannerbear SDK in Ruby, Node.js and PHP. The text and the image in the template can be modified by sending the values via URL parameter modifications as a Base64-encoded JSON array. You will also need to create a Signed URL Base to use the Signed URL feature. The thumbnail with text will be generated automatically when a user visits your website.įirst, you need to create a Bannerbear design template for your thumbnail. If you are embedding your video on a website, you can generate text on your thumbnail automatically using Bannerbear via Signed URL. There are many more options for map, you can see them in the FFmpeg documentation.įFmpeg can help you to generate a thumbnail image for your video but there is no text on the thumbnail.Īdding text to the video thumbnail can attract the attention of your audiences and helps them to understand the context of the video better before playing the video. The second -map 0 refers to the input index #0, which is the first input, input.mp4. The first -map 1 refers to the input index #1, which is the second input, thumbnail.png. The map option is used to choose which streams from the inputs should be included in the output.įfmpeg -i input.mp4 -i thumbnail.png -map 1 -map 0 -c copy -disposition:0 attached_pic output.mp4 Once you have the image, you can set the thumbnail for the video. If you want to know more about other ways to extract images from a video using FFmpeg, here’s a detailed tutorial: How to Extract Images from a Video Using FFmpeg. Without this option, the images generated will be in sequence and they might look the same.įrom the 5 unique images generated, you can choose the image that best represents the video manually.īear Tip ?: You can rescale your video by using -vf scale=width:height, eg. Vsync vfr is used to make sure that the images are different. The command above selects only frames that have more than 40% changes compared to the previous frames and generate 5 unique PNGs. A low value means that it is less likely for the current frame to be a new scene while a high value means that it is likely to be one. The value of scene should be between 0 and 1. Depending on the content of the video, you need to tweak this value to find the best threshold. Select=gt(scene\,0.4) selects frames that have more than 40% scene change compared to the previous frames. The basic command to capture a frame from the video using FFmpeg is:įfmpeg -i input.mp4 -vf "select=gt(scene\,0.4)" -frames:v 5 -vsync vfr frames-diff-d.png We will be using this video for this tutorial to showcase how different FFmpeg commands work. For reference, the version of FFmpeg used in this tutorial is v5.0.1. You will need to download FFmpeg for this tutorial to add a thumbnail to your video file. In this tutorial, we will be using the FFmpeg command-line tool. It contains multiple tools for end-users to convert, play and analyze media files and libraries for developers to use in different applications. It is also highly portable as it compiles and runs in a wide variety of build environments, machine architectures, and configurations like Linux, Mac OS X, Microsoft Windows, etc. It can decode, encode, transcode, mux, demux, stream, filter and play pretty much any media file in any format. In this tutorial, I'm going to show you how to add a custom thumbnail to your video file and use Bannerbear to auto-generate text for it so that your video will look like this on a website:įFmpeg is a complete, cross-platform solution to record, convert and stream audio and video. It makes people WANT to watch your video. A good thumbnail image highlights the content of your video and makes it stands out. A video thumbnail is a still image that acts as the preview image for your video.
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