# Stream Smart Remux

Rewrap media containers with stream copy.

> Canonical page: https://elysiatools.com/en/tools/stream-smart-remux

- **Category:** Media

- **Keywords:** remux, stream copy, ffmpeg

## Overview

Fast container conversion using -c copy. It fails clearly when the selected container cannot hold the existing codecs.

## Inputs

- **Media File** (file)
- **Output Container** (select)

## When to use

- When you need to change a video container format without losing quality through re-encoding.
- When you want to repackage media streams instantly without consuming CPU resources for rendering.
- When preparing video files for devices or players that only support specific container formats like MP4 or MOV.

## How it works

- Upload your source video or audio file up to the 100MB limit.
- Select your desired output container format from MP4, MKV, MOV, or WebM.
- The tool copies the underlying audio and video streams directly into the new container and provides the processed file for download.

## Use cases

- Changing an MKV recording from OBS into an MP4 container for editing in software that does not support MKV.
- Rewrapping a MOV file from a camera into an MP4 container for wider web compatibility.
- Converting incompatible WebM files to MKV to ensure all audio and video tracks are preserved in a highly compatible container.

## Frequently asked questions

### Does this tool re-encode my video?

No, it uses stream copying to change the container without altering the original video or audio tracks.

### Why did my conversion fail?

The conversion fails if the target container does not support the codecs inside your source file. Try selecting MKV as it supports almost all codecs.

### What is the maximum file size supported?

You can upload media files up to 100MB.

### Can I convert audio-only files?

Yes, the tool supports both audio and video files as inputs.

### Does remuxing reduce the quality of the media?

No, because the streams are copied directly without decompression or compression, the quality remains identical.

## Related tools

- [Batch Video Converter](https://elysiatools.com/en/tools/video-batch-converter): Convert multiple video files between different formats like MP4, WebM, MKV, AVI, MOV with quality settings and batch processing
- [Video to GIF Optimized](https://elysiatools.com/en/tools/video-to-gif-optimized): Convert videos to optimized GIF format with advanced compression settings
- [Video Stream Extractor](https://elysiatools.com/en/tools/video-stream-extractor): Extract audio and/or video streams from a video file using stream copy (no transcoding) after probing stream availability
- [MKV to MP4 Converter](https://elysiatools.com/en/tools/mkv-to-mp4): Convert MKV video files to MP4 format
- [MOV to MP4 Converter](https://elysiatools.com/en/tools/mov-to-mp4): Convert MOV video files to MP4 format
- [MP4 to MKV Converter](https://elysiatools.com/en/tools/mp4-to-mkv): Convert MP4 video files to MKV format
- [MP4 to MOV Converter](https://elysiatools.com/en/tools/mp4-to-mov): Convert MP4 video files to MOV format
- [MP4 to WebM Converter](https://elysiatools.com/en/tools/mp4-to-webm): Convert MP4 video files to WebM format

## Samples

- [Bevy Game Engine Samples](https://elysiatools.com/en/samples/bevy-samples): Bevy Rust game engine examples with ECS, 2D/3D graphics, audio, and game mechanics implementations
- [Godot Engine Samples](https://elysiatools.com/en/samples/godot): Godot Engine examples including 2D/3D games, GDScript, C#, and engine features
- [Video AV1 Samples](https://elysiatools.com/en/samples/video-av1-samples): Sample video files encoded in AV1 format
- [Video H.264 Samples](https://elysiatools.com/en/samples/video-h264-samples): Sample video files encoded in H.264 (AVC) format

## Related content

- [Stream Copy, Remux, and Media Packaging Tools](https://elysiatools.com/en/hubs/stream-copy-remux-and-media-packaging): Compare probe, remux, trim, mux, soft-subtitle, cover-art, and batch rewrap tools in one hub for low-CPU media packaging workflows.
- [Audio Encoding and Format Conversion Tools](https://elysiatools.com/en/hubs/audio-convert): Compare audio format conversion, bitrate changes, sample-rate conversion, codec swaps, and export tools in one hub for delivery and archive workflows.
- [Video-to-Audio and Animation Conversion Tools](https://elysiatools.com/en/hubs/video-convert): Compare tools that turn video into audio, extract video streams, and convert between short-form video and animated image formats in one hub.
- [Audio Editing and Cleanup Tools](https://elysiatools.com/en/hubs/audio-utility): Compare audio trimming, silence removal, fades, mixing, and denoise tools in one hub for podcast, voiceover, and music cleanup workflows.