WEBM WebM media file

AI-powered detection and analysis of WebM media file files.

📂 Video

🏷️ .webm

🎯 video/webm

🔍

Instant WEBM File Detection

Use our advanced AI-powered tool to instantly detect and analyze WebM media file files with precision and speed.

File Information

File Description

WebM media file

WebM Video Format

Overview

WebM is an open, royalty-free media file format designed for the web. Developed by Google, it provides efficient compression for video and audio content while maintaining high quality. WebM is widely supported by modern web browsers and streaming platforms.

Technical Specifications

Format Type: Container format for video and audio
Video Codecs: VP8, VP9, AV1
Audio Codecs: Vorbis, Opus
File Extension: .webm
MIME Type: video/webm
Container: Based on Matroska (MKV) format
Maximum Resolution: Unlimited (codec-dependent)

Format Structure

WebM files use the Matroska container with specific codec restrictions:

EBML (Extensible Binary Meta Language) header
Segment containing tracks, clusters, and metadata
Video tracks using VP8, VP9, or AV1
Audio tracks using Vorbis or Opus
Cues for seeking support
Tags for metadata

History and Development

2010: WebM project announced by Google
2011: WebM 1.0 specification released
2013: VP9 codec added to WebM specification
2018: AV1 codec support added
2019: WebM becomes part of Alliance for Open Media initiatives

Codec Details

Video Codecs

VP8: Initial WebM video codec, good compression
VP9: Improved successor to VP8, 50% better compression
AV1: Next-generation codec with superior compression

Audio Codecs

Vorbis: Open-source audio codec, part of Ogg project
Opus: Modern, low-latency audio codec

Use Cases

Web video streaming and playback
HTML5 video elements
Real-time communication (WebRTC)
Video sharing platforms
Progressive web applications
Mobile video applications

Code Examples

HTML5 Video Element

<!DOCTYPE html>
<html>
<head>
    <title>WebM Video Example</title>
</head>
<body>
    <video controls width="640" height="480">
        <source src="video.webm" type="video/webm">
        <source src="video.mp4" type="video/mp4">
        Your browser does not support the video tag.
    </video>
</body>
</html>

JavaScript Video Control

const video = document.querySelector('video');

// Load and play WebM video
video.src = 'example.webm';
video.load();

// Event listeners
video.addEventListener('loadedmetadata', () => {
    console.log(`Duration: ${video.duration} seconds`);
    console.log(`Dimensions: ${video.videoWidth}x${video.videoHeight}`);
});

video.addEventListener('canplay', () => {
    video.play();
});

// Quality adaptation
function selectQuality() {
    const connection = navigator.connection;
    if (connection && connection.effectiveType === '4g') {
        video.src = 'high-quality.webm';
    } else {
        video.src = 'low-quality.webm';
    }
}

WebRTC with WebM

// MediaRecorder API for WebM recording
navigator.mediaDevices.getUserMedia({ video: true, audio: true })
    .then(stream => {
        const mediaRecorder = new MediaRecorder(stream, {
            mimeType: 'video/webm;codecs=vp9,opus'
        });
        
        const chunks = [];
        
        mediaRecorder.ondataavailable = (event) => {
            chunks.push(event.data);
        };
        
        mediaRecorder.onstop = () => {
            const blob = new Blob(chunks, { type: 'video/webm' });
            const url = URL.createObjectURL(blob);
            
            const downloadLink = document.createElement('a');
            downloadLink.href = url;
            downloadLink.download = 'recorded.webm';
            downloadLink.click();
        };
        
        // Start recording
        mediaRecorder.start();
        
        // Stop after 10 seconds
        setTimeout(() => {
            mediaRecorder.stop();
        }, 10000);
    });

Creation and Conversion Tools

FFmpeg Commands

# Convert MP4 to WebM with VP9 and Opus
ffmpeg -i input.mp4 -c:v libvpx-vp9 -c:a libopus output.webm

# High-quality VP9 encoding
ffmpeg -i input.mp4 -c:v libvpx-vp9 -crf 15 -b:v 0 \
       -c:a libopus -b:a 128k output.webm

# Two-pass encoding for better quality
ffmpeg -i input.mp4 -c:v libvpx-vp9 -pass 1 -b:v 1000k \
       -threads 8 -speed 4 -tile-columns 6 -frame-parallel 1 \
       -an -f webm /dev/null

ffmpeg -i input.mp4 -c:v libvpx-vp9 -pass 2 -b:v 1000k \
       -threads 8 -speed 1 -tile-columns 6 -frame-parallel 1 \
       -auto-alt-ref 1 -lag-in-frames 25 \
       -c:a libopus -b:a 64k output.webm

# AV1 encoding (slower but better compression)
ffmpeg -i input.mp4 -c:v libaom-av1 -crf 30 -b:v 0 \
       -c:a libopus output.webm

GStreamer Pipeline

# Simple WebM encoding pipeline
gst-launch-1.0 videotestsrc ! videoconvert ! vp9enc ! webmmux ! \
               filesink location=test.webm

# Camera to WebM with audio
gst-launch-1.0 v4l2src device=/dev/video0 ! videoconvert ! vp9enc ! \
               webmmux name=mux ! filesink location=output.webm \
               alsasrc ! audioconvert ! opusenc ! mux.

Quality and Compression Settings

VP9 Quality Levels

# Lossless VP9
ffmpeg -i input.mp4 -c:v libvpx-vp9 -lossless 1 output.webm

# Variable bitrate with quality control
ffmpeg -i input.mp4 -c:v libvpx-vp9 -crf 23 -b:v 0 output.webm

# Constant bitrate for streaming
ffmpeg -i input.mp4 -c:v libvpx-vp9 -b:v 2M -maxrate 2M \
       -bufsize 4M output.webm

Opus Audio Settings

# High-quality audio
ffmpeg -i input.wav -c:a libopus -b:a 192k output.webm

# Low-bitrate speech
ffmpeg -i input.wav -c:a libopus -b:a 32k output.webm

# Variable bitrate audio
ffmpeg -i input.wav -c:a libopus -vbr on -compression_level 10 output.webm

Browser Support and Compatibility

Chrome: Full support for VP8, VP9, AV1, Vorbis, Opus
Firefox: Full support for all WebM codecs
Safari: Limited support (VP8, VP9 on macOS Big Sur+)
Edge: Full support in Chromium-based versions
Mobile: Generally good support on Android, limited on iOS

Streaming and Adaptive Bitrate

DASH Manifest for WebM

<?xml version="1.0" encoding="UTF-8"?>
<MPD xmlns="urn:mpeg:dash:schema:mpd:2011">
    <Period>
        <AdaptationSet mimeType="video/webm" codecs="vp9">
            <Representation bandwidth="500000" width="640" height="360">
                <BaseURL>low_quality.webm</BaseURL>
            </Representation>
            <Representation bandwidth="1500000" width="1280" height="720">
                <BaseURL>medium_quality.webm</BaseURL>
            </Representation>
            <Representation bandwidth="3000000" width="1920" height="1080">
                <BaseURL>high_quality.webm</BaseURL>
            </Representation>
        </AdaptationSet>
    </Period>
</MPD>

JavaScript Adaptive Streaming

class WebMAdaptivePlayer {
    constructor(videoElement) {
        this.video = videoElement;
        this.qualities = [
            { url: 'low.webm', bandwidth: 500000, resolution: '360p' },
            { url: 'medium.webm', bandwidth: 1500000, resolution: '720p' },
            { url: 'high.webm', bandwidth: 3000000, resolution: '1080p' }
        ];
        this.currentQuality = 0;
    }
    
    selectQuality() {
        const connection = navigator.connection;
        if (connection) {
            const bandwidth = connection.downlink * 1000000; // Convert to bps
            
            for (let i = this.qualities.length - 1; i >= 0; i--) {
                if (bandwidth >= this.qualities[i].bandwidth * 1.5) {
                    this.currentQuality = i;
                    break;
                }
            }
        }
        
        this.video.src = this.qualities[this.currentQuality].url;
    }
}