How do I find the M3U8 URL of a video?

Open the video page in Chrome, press F12 to open DevTools, go to the Network tab, type .m3u8 in the filter box, then start playing the video. The M3U8 request will appear — right-click it and copy the URL.

Will the converted MP4 lose quality?

No — using stream copy (-c copy, the default in both StreamFlow and FFmpeg) directly copies the video data without re-encoding. Quality and file size are identical to the original segments. Quality loss only occurs if you explicitly re-encode (e.g., to change resolution).

Why does the converted video not play?

Most common causes: ① TS-wrapped H.265 video that some players do not support — use VLC; ② AC-3 audio that Windows Media Player cannot decode — use VLC or PotPlayer; ③ Missing -bsf:a aac_adtstoasc flag in FFmpeg causing a broken audio header.

How to Convert M3U8 to MP4: 3 Methods Compared

— 广告位 In-Article —

Why Convert M3U8 to MP4?

M3U8 is a streaming playlist — the actual video is split into dozens of .ts segments scattered across a server. While ideal for online streaming, this format is inconvenient for offline use: it cannot be imported into video editors, cannot be played without internet, and is not suitable for archiving. Converting to MP4 solves all of these problems.

⚠ Copyright notice: Only convert content you have the right to download — content you recorded yourself, public domain material, or content the platform explicitly allows for offline use.

Method 1: StreamFlow Online Converter (Recommended)

Visit the StreamFlow converter. Everything runs in your browser — no data is sent to any server.

Copy the M3U8 URL (usually ending in .m3u8)
Paste it into the input field and set an output filename
Choose concurrency (5 recommended; use 8 on a fast connection)
Click "Start Converting" and wait for download and merge to complete
Click "Download MP4" to save the file

✓ Advantage: No installation needed, works on Windows / Mac / Linux. Processing happens entirely in your browser — your video never leaves your device.

Method 2: FFmpeg Command Line

# Simplest conversion (stream copy, no re-encoding — fastest)
ffmpeg -i "https://example.com/video/index.m3u8" -c copy output.mp4

# Fix audio issues with AAC streams
ffmpeg -i "https://example.com/video/index.m3u8" -c copy -bsf:a aac_adtstoasc output.mp4

# Re-encode (use when changing resolution or format)
ffmpeg -i "https://example.com/video/index.m3u8" -c:v libx264 -c:a aac output.mp4

✓ Advantage: Supports encrypted M3U8, custom output formats, multiple audio tracks and subtitles. Best for users comfortable with the command line.

Method 3: N_m3u8DL-RE (Fastest)

An open-source tool built specifically for M3U8 downloads, with multi-threaded parallel downloading for maximum speed:

N_m3u8DL-RE "https://example.com/video/index.m3u8" -sv best

Download from: github.com/nilaoda/N_m3u8DL-RE (Windows, Linux, macOS)

Method Comparison

Method	Difficulty	Speed	Encrypted M3U8	Best for
StreamFlow Online	⭐ Easiest	Medium	✗	General users
FFmpeg	⭐⭐ Medium	Medium	✓	Developers
N_m3u8DL-RE	⭐⭐ Medium	Fastest	✓	Power users

💡 Troubleshooting Common Conversion Failures

CORS error: The server blocks cross-origin requests. Browser tools cannot bypass this — switch to FFmpeg, which is not subject to CORS restrictions.
Some segments fail to download: StreamFlow skips failed segments and continues merging. The final video may have brief black frames at those points.
Video plays but no audio: Add -bsf:a aac_adtstoasc to the FFmpeg command to fix the AAC audio container header.
Progress stalls at a percentage: A segment download timed out. Lower the concurrency setting and retry, or wait for better network conditions.
File is large but very short: You may have downloaded a master playlist URL that points to another M3U8 instead of actual segments. Verify the URL.