How to Convert WebM to MP4 with FFmpeg on Windows?

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

If you have specific requirements on the export video parameters, such as outputting MP4 with H.264 and MP3 codec, etc. You can use this command (change the value for your actual needs):

ffmpeg -i sample.webm -c:v libx264 -b:v 5000k -vf "scale=1920:1080,fps=24" -c:a libmp3lame output.mp4

This will generate an MP4 with the H.264 video codec and the MP3 audio codec, at a resolution of 1080p, a bitrate of 5000kbps, and a framerate of 24fps.

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.

Step 1. 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. 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.

Optional: In the Parameter settings, you can modify the video output settings, including the codec, resolution, bitrate, frame rate, volume, and more.

Also, you can just leave it by default. The Smart-Fit offers the optimal output settings for you.

Step 4. Click the triangle button at the bottom of the program to choose an output folder. Finally, click Run to start conversion immediately.