ts-to-mp4

A pure Rust library and CLI tool for remuxing MPEG-TS to MP4 without transcoding, similar to ffmpeg -c copy.

Features

• No transcoding - Copies H.264 video and AAC audio streams directly
• Pure Rust - No external dependencies like ffmpeg
• Simple API - Just remux(input, output)
• CLI included - Convert files from the command line

What it does

1. Demuxes MPEG-TS - Parses transport stream packets, PAT/PMT tables, and PES packets
2. Processes H.264 - Converts from Annex B format (start codes) to AVCC format (length-prefixed NAL units)
3. Processes AAC - Strips ADTS headers from audio frames
4. Muxes to MP4 - Writes a valid MP4 container with proper metadata

Browser Demo

Try the converter in your browser: rajbot.github.io/ts-to-mp4

All processing happens locally in your browser using WebAssembly - no files are uploaded.

Command Line Usage

Install

cargo install --git https://github.com/rajbot/ts-to-mp4 --features cli

Run

# Convert input.ts to input.mp4
ts-to-mp4 input.ts

# Specify output filename
ts-to-mp4 input.ts -o output.mp4

# Show help
ts-to-mp4 --help

Library Usage

Add to your Cargo.toml:

[dependencies]
ts-to-mp4 = { git = "https://github.com/rajbot/ts-to-mp4" }

From file paths

ts_to_mp4::remux_file("input.ts", "output.mp4")?;

From readers/writers

use std::fs::File;
use std::io::BufReader;

let input = BufReader::new(File::open("input.ts")?);
let mut output = File::create("output.mp4")?;
ts_to_mp4::remux(input, &mut output)?;

Supported formats

• Video: H.264/AVC
• Audio: AAC (ADTS)
• Container: MPEG-TS input, MP4/M4V output

Building WebAssembly

To build and run the web version locally:

# Build WASM module
./build-wasm.sh

# Start local server
cd web && python3 -m http.server 8000

# Open http://localhost:8000

Limitations

• Video-only files must contain H.264
• Audio-only files are not supported (video track required)
• Does not support other codecs (H.265/HEVC, VP9, etc.)

License

GNU Affero General Public License v3.0 (AGPL-3.0)