Convert MP4 to WEBM in Java

2 min readSep 28, 2020


YouTube and other online media platforms rely on WEBM as their preferred file format. Where we have previously discussed how to convert files to WEBM in Node.JS, we will now go over how you can apply this process in Java. This API will allow you to use Java to add WEBM conversion capabilities to your applications.

Our first step is to add a Jitpack reference to the repositories:


Next, we can add a reference for our API client to the dependency in pom.xml:


Then, we can call our function, VideoConvertToWebm:

// Import classes:
//import com.cloudmersive.client.invoker.ApiClient;
//import com.cloudmersive.client.invoker.ApiException;
//import com.cloudmersive.client.invoker.Configuration;
//import com.cloudmersive.client.invoker.auth.*;
//import com.cloudmersive.client.VideoApi;
ApiClient defaultClient = Configuration.getDefaultApiClient();// Configure API key authorization: Apikey
ApiKeyAuth Apikey = (ApiKeyAuth) defaultClient.getAuthentication("Apikey");
Apikey.setApiKey("YOUR API KEY");
// Uncomment the following line to set a prefix for the API key, e.g. "Token" (defaults to null)
VideoApi apiInstance = new VideoApi();
File inputFile = new File("/path/to/inputfile"); // File | Input file to perform the operation on.
String fileUrl = "fileUrl_example"; // String | Optional; URL of a video file being used for conversion. Use this option for files larger than 2GB.
Integer maxWidth = 56; // Integer | Optional; Maximum width of the output video, up to the original video width. Defaults to original video width.
Integer maxHeight = 56; // Integer | Optional; Maximum height of the output video, up to the original video width. Defaults to original video height.
Boolean preserveAspectRatio = true; // Boolean | Optional; If false, the original video's aspect ratio will not be preserved, allowing customization of the aspect ratio using maxWidth and maxHeight, potentially skewing the video. Default is true.
Integer frameRate = 56; // Integer | Optional; Specify the frame rate of the output video. Defaults to original video frame rate.
Integer quality = 56; // Integer | Optional; Specify the quality of the output video, where 100 is lossless and 1 is the lowest possible quality with highest compression. Default is 50.
try {
byte[] result = apiInstance.videoConvertToWebm(inputFile, fileUrl, maxWidth, maxHeight, preserveAspectRatio, frameRate, quality);
} catch (ApiException e) {
System.err.println("Exception when calling VideoApi#videoConvertToWebm");

Now, you can easily convert your video files to WEBM to meet compatibility with online video services. You can retrieve your free API Key from the Cloudmersive website. This will give you access to 800 monthly calls across our library of APIs.




There’s an API for that. Cloudmersive is a leader in Highly Scalable Cloud APIs.