How to Convert WebM to MP4 with FFmpeg on Windows?

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Steps to Convert WebM to mp4 with FFmpeg

WebM is an open, royalty-free, media file format designed for the browser or the internet. This format is commonly found on HTML5 sites like YouTube. But it is not supported by many players. In case you want to play your downloaded .webm file on a PC or phone, you’d better convert it to a universally adopted format, such as MP4. To do this, you’ll need a handy video converter. In the following part, we’ll share with you two powerful video converters. Let’s dive in now!

Steps to Let FFmpeg Convert WebM to MP4

Let’s get started with FFmpeg.

FFmpeg is a free yet powerful command line tool available for Windows, Linux, and Mac. It can be used to make fast audio and video conversions with high quality preserved. Enter the command line to process the format conversion. It seems easy to do but many fail as they often input the wrong command. Don’t worry! To help you convert WebM to MP4 with FFmpeg successfully, we have prepared a guide for you. Follow the steps here:

Step 1. Let’s assume that you have installed FFmpeg on your Windows PC. If not, get the latest FFmpeg here.

Step 2. Press Windows key + R and enter “CMD” in the search box. Hit OK to bring up the Command Prompt.

Step 3. Now, in the CMD window, type the “cd” command to specify the directories for the source .webm file. Simply enter cd, a space, paste the directory name, then press the Enter key. Here is how it looks:

cd “Paste the directory’s name here”

Check the image below:

Pro-tips: There is a quicker way to open up the CMD window and start the conversion, without using the cd command. Take the steps as follows:

Open the location of your desired .webm file. Then, change the full file path to CMD and press Enter to open the command line tool.

As shown in the picture:

Step 3. Then press Enter. Now, you’re ready to start the conversion. Run this command line to let FFmpeg convert WebM to MP4:

ffmpeg -i file’name.webm file’name.mp4

Here is how it looks in an actual process:

Now, press Enter key to activate the conversion process. Bingo! You get the MP4 video in the same directory as the original one (as shown in the picture).

By using different commands, you can use FFmpeg to extract the audio from the WebM video, reduce its file size, cut it into clips, or modify its resolution.

Here is the command line for downscaling its resolution when converted to MP4.

ffmpeg -i sample.webm -c:a copy -s 1280x720 output.mp4

Run it and you will quickly get a 720p MP4 video file.

Best Alternative Way to Convert WebM to MP4

If you are daunted by its confusing command language and are looking for a simpler FFmpeg alternative to make format conversion, then look no further than WonderFox Free HD Video Converter Factory. This Windows-based video converter is strongly recommended for its simplicity and excellent performance. It supports a wide range of video and audio files and can convert a WebM file to MP4, AVI, MKV, and other 500+ formats with no fuss.

Moreover, it provides advanced settings to let you modify its parameters to control the output quality and size. You can also use it to download videos from YouTube, Vimeo, TikTok, and 500+ hot video-sharing sites.

Step 1. Add WebM Files to the Converter Program

Free downloadFree download the reliable video converter to your PC first.

Then open it and enter the Converter module. Press Add Files button to import the source WebM file into the converter. Also, you can drag the video into the conversion list directly.

Step 2. Select MP4 as the Output Format

On the right side of the converter, hit on the format image to open the output format list. Head to the Video category and choose the MP4 profile below.