HTML5 Video Streaming Technology: Current Status and Solutions for RTSP/RTP Protocol Support

Overview of HTML5 Video Tag Protocol Support

The HTML5 <video> tag is designed to be protocol-agnostic, theoretically capable of supporting any video streaming protocol. From a specification perspective, the W3C HTML5 standard explicitly states: "User agents may support any video and audio codecs and container formats." This means developers can specify RTSP or RTP protocol URLs in the src attribute, for example:

<video src="rtsp://example.com/path/to/stream">
    Your browser does not support the VIDEO tag and/or RTP streams.
</video>

However, there is a significant gap between theoretical specifications and practical implementation.

Current Browser Compatibility Status

Despite the flexibility allowed by HTML5 specifications, mainstream browsers have extremely limited support for RTSP/RTP protocols. The Chromium development team has explicitly stated that they will not add RTSP streaming support to Chrome, a position that applies to other Chromium-based browsers as well. Other major browsers like Firefox also lack native support for RTSP protocol.

This limitation primarily stems from technical architecture considerations: RTSP/RTP protocols require specific network stacks and processing logic, while modern browsers prefer to support HTTP-based streaming protocols like HLS and MPEG-DASH.

Practical Solutions

Solution 1: Protocol Conversion Technology

The most reliable solution involves server-side protocol conversion, transforming RTSP streams into browser-native supported formats. Using FFmpeg tool enables real-time transcoding:

ffmpeg -v info -i rtsp://ip:port/h264.sdp -c:v copy -c:a copy \
       -bufsize 1835k -pix_fmt yuv420p -flags -global_header \
       -hls_time 10 -hls_list_size 6 -hls_wrap 10 \
       -start_number 1 /var/www/html/stream.m3u8

This command converts RTSP streams to HLS format in real-time, generating .m3u8 playlist files. The converted streams can be distributed through standard HTTP servers and played using JavaScript player libraries like Video.js.

Solution 2: WebRTC Technology Stack

WebRTC provides another viable technical path. Since WebRTC uses SRTP (Secure Real-time Transport Protocol) at its core, it can be considered as an encrypted version of RTP protocol. The implementation requires deploying WebRTC signaling servers and media servers:

// WebRTC connection establishment example
const peerConnection = new RTCPeerConnection(configuration);
peerConnection.ontrack = (event) => {
    const videoElement = document.getElementById('video');
    videoElement.srcObject = event.streams[0];
};

Although this method has higher technical complexity, it enables low-latency real-time video transmission.

Solution 3: WebSocket Transmission

For custom streaming applications, WebSocket provides flexible transmission mechanisms. Video data can be transmitted through WebSocket connections and played using MediaSource Extensions API:

const ws = new WebSocket('ws://server/video-stream');
const mediaSource = new MediaSource();
const video = document.querySelector('video');
video.src = URL.createObjectURL(mediaSource);

Technology Selection Recommendations

When choosing specific solutions, developers need to consider the following factors: latency requirements, browser compatibility, server resources, and technical complexity. For most web application scenarios, the protocol conversion solution (RTSP to HLS) provides the best balance, ensuring wide browser compatibility while maintaining good real-time performance.

Future Development Trends

As new technologies like WebCodecs API and WebTransport mature, more direct streaming solutions may emerge in the future. However, at the current stage, protocol conversion and WebRTC remain the most reliable methods for implementing RTSP/RTP streaming in web applications.