How to Convert WebM to MP4 Using FFmpeg [Step-by-Step Guide]
- Last updated on 2025-02-19
Table Of Content
What is FFmpeg?
FFmpeg is a free, open-source software project that enables conversion, editing, and processing of video, audio, and other multimedia files. Known for its versatility, FFmpeg supports a wide range of formats, making it a popular choice for file conversions like converting WebM to MP4.
WebM vs. MP4: What's the Difference?
Understanding the differences between WebM and MP4 can clarify why you might want to convert from one to the other.
- WebM: A format primarily designed for web streaming, WebM is optimized for online video playback and supports VP8/VP9 codecs. However, it has limited compatibility outside web browsers and select media players.
- MP4: MP4 is a widely supported format compatible with nearly all devices and platforms, including smartphones, consoles, and streaming services. It typically uses H.264 or HEVC for video compression, delivering high-quality output suitable for both online and offline use.
Why Convert WebM to MP4?
✅ Greater Device Compatibility – MP4 files work on almost any device, while WebM has limited support, especially on Apple devices.
✅ Improved Offline Accessibility – MP4 is better for offline viewing and sharing, making it more versatile across platforms.
✅ Better Quality and Codec Support – MP4 supports high-quality encoding with widely used codecs like H.264 and H.265, ensuring better playback and compression efficiency.
✅ Broader Software Compatibility – MP4 files are supported by most video editing software, whereas WebM may require additional codecs or conversions.
How to Convert WebM to MP4 Using FFmpeg
Follow these steps to convert WebM to MP4 with FFmpeg:
Install FFmpeg
If FFmpeg isn’t already installed, download it from the official FFmprg website. Installation instructions:
- Windows: Download from the website and follow installation steps.
- macOS: Use Homebrew:
brew install ffmpeg - Linux: Install via your package manager:
sudo apt updatesudo apt install ffmpeg
Open Command Prompt or Terminal
After installation, open Command Prompt (Windows) or Terminal (macOS/Linux).
Run the Conversion Command
Convert your WebM file to MP4 with this command:ffmpeg -i input.webm output.mp4
Replace input.webm with the path to your WebM file, and output.mp4 with your desired file name.
Adjust Quality and Bitrate (Optional)
FFmpeg lets you set the output quality by adjusting the bitrate: ffmpeg -i input.webm -b:v 1000k output.mp4
Here, 1000k sets the video bitrate to 1000 kbps. Adjust this value to suit your quality requirements.
Add Audio Codec (If Needed)
For greater compatibility, specify the audio codec: ffmpeg -i input.webm -c:v libx264 -c:a aac output.mp4
This ensures MP4 uses H.264 for video and AAC for audio, widely supported across devices.
Run the Command and Wait for Conversion
FFmpeg will process the file. Conversion time depends on file size and quality settings.
Simple FFmpeg Alternative for WebM to MP4: UniFab Video Converter
For beginners or those seeking a simpler interface, UniFab Video Converter is highly recommended. UniFab supports WebM to MP4 and many other formats, including MKV, MOV, AVI, WMV, WAV, FLAC, MP3, and more. It offers fast conversion speeds by using multi-core CPU and GPU acceleration.
Key Features
✅ Supports 1000+ Video Formats: Ensures compatibility with all devices, including mobile and portable options.
✅ Resize Without Quality Loss: Adjusts video size for platform requirements while maintaining high quality.
✅ Lossless Compression: Retains high-quality video and audio (TrueHD, DTS-HD, DTS X) for smooth sharing.
✅ Built-in Editor: Trim, rotate, crop, adjust aspect ratio, apply effects, add watermark, subtitles, audio, and speed adjustments.
✅ Advanced Settings: Customize resolution, codec, frame rate, bitrate, channels, and more.
- UniFab Client with Upscaler, HDR Upconverter, Smoother & More
- Experience up to 3 watermark-free videos on each AI model
- Enjoy Free AI Tools: Vocal Remover & Video Background Remover
- 30-Day Free Trial—Download Now to Convert and Enhanc Your Videos!
Effortlessly Convert WebM to MP4 With UniFab
Open UniFab and Select 'Converter' module
Open UniFab, click "All Features" to select the "Converter" module.
Import Your WebM File
Add your WebM file from a local folder. On the current interface, you'll see the features of UniFab Video Converter.
Select MP4 Format
Click the dropdown list on the right side of "Output" in the Step 2 interface, and select "Choose other format" to choose MP4 as your output format.
Adjust Output Settings (Optional)
Click "settings icon" to customize bitrate, resolution, and more if needed.
Edit Your Video
UniFab also offers a built-in editor that allows you to make various adjustments to your video.
Start Conversion
Click Start, and let UniFab handle the WebM to MP4 conversion swiftly.
Conclusion
With FFmpeg, converting WebM to MP4 is straightforward for users comfortable with command-line tools. However, if you prefer a more user-friendly option, UniFab Video Converter provides an intuitive and efficient way to achieve the same results with additional format support and customization options.
FAQs about WebM to MP4
Is WebM or MP4 Better Quality?
The quality of WebM and MP4 depends on the codec and bitrate. MP4 (H.264/H.265) generally offers excellent quality with efficient compression and wide compatibility. WebM (VP8/VP9) might provide slightly better quality at lower bitrates but isn't as universally supported. In most cases, the quality difference is minimal unless working with very high or low bitrates.
How Do I Change a WebM File to MP4?
To change a WebM file to MP4, you can use UniFab Video Converter, which offers a simple and user-friendly solution. With just a few clicks, you can easily convert your WebM files to MP4 format, ensuring high-quality output. UniFab supports various formats and provides customization options, making it an efficient tool for all your video conversion needs.
Is it safe to use FFmpeg?
FFmpeg is safe to use. It's a trusted open-source command-line tool designed for converting and processing video, audio, and other compressed media formats without any hidden threats.
What are the limitations of FFmpeg?
Some limitations in FFmpeg arise from codec and container compatibility, which may restrict video frame size, frame rate, or bitrate. Always review the specifications of your chosen codec and container format to ensure they meet your needs.
Do I need a powerful computer for FFmpeg or UniFab?
FFmpeg runs well on most computers, but performance and conversion speed can vary. For faster processing, UniFab leverages CPU and GPU acceleration on multi-core systems, enabling quicker results, especially on more advanced setups.