About Us

Professional M3U8 Online Player

StreamFlow is a fully browser-based HLS streaming player and converter. No installation, no uploads, full privacy protection — effortless video processing.

100%

Runs Locally

Server Uploads

HLS.js

Core Engine

Languages

Core Features

▶

Online Streaming

Paste any M3U8 URL for instant playback. Live streams and VOD both supported — no plugins needed.

📊

Adaptive Bitrate

Auto-parses master playlists and lists all quality levels. Switch manually at any time.

⇄

M3U8 to MP4

Concurrent TS segment download and local merging into MP4. Fully offline, fully private.

📈

Live Playback Stats

Monitor resolution, bitrate, and buffer duration in real time.

🌐

Bilingual UI

Full Chinese and English support. One click to switch — all content updates instantly.

🔒

Local Privacy

All processing happens in your browser. Your video never touches any third-party server.

How It Works

▶ HLS Playback

Fetch Playlist — Load the .m3u8 file and parse the master or media playlist

Bitrate Selection — Auto-select the best quality based on network conditions

Segment Download — Sequentially download .ts segments into the playback buffer

MSE Injection — Feed segments into the video element via Media Source Extensions

HLS.jsMSE APIVideo ElementWeb Worker

⇄ Conversion Process

Parse M3U8 — Extract all TS segment URLs, resolve relative and absolute paths

Concurrent Fetch — Download multiple segments in parallel with configurable concurrency

In-memory Merge — Concatenate all segments in order using a Uint8Array buffer

Blob Export — Create a video/mp4 Blob and trigger download via Object URL

Fetch APIUint8ArrayBlob APIPromise.all

Use Cases

🔬

Live Stream Debugging

Quickly verify HLS live streams are working correctly — no test environment needed.

📦

Video Archiving

Convert online M3U8 videos to local MP4 files for offline viewing and storage.

🎓

E-learning Platforms

Educational platforms typically use HLS delivery. Easily preview and download courses.

🛠️

Streaming Dev & Test

Test M3U8 files from different CDNs, verify CORS settings and playlist format.

📡

IPTV Preview

Many IPTV and online TV services use M3U8. Quickly preview and validate channel content.

🔭

Media Research

Study the HLS protocol, M3U8 format spec, fragmentation strategies, and ABR algorithms.

✉️

[email protected]

Technical support & feature requests

💻

GitHub

github.com/streamflow

Submit issues & contribute code

🐦

Twitter / X

@streamflow_app