Video Dual Audio Merger

Video Dual Audio Merger | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Media
Input types: file, select, text
Output type: file
Sample coverage: 4
API ready: Yes

Overview

The Video Dual Audio Merger allows you to mux two separate audio tracks into a single video file using copy mode, preserving the original video and audio quality without time-consuming re-encoding. You can customize the output container to MKV or MP4 and assign specific language codes and track titles to both the primary and secondary audio streams.

When to use

When you want to add a secondary language track or commentary track to an existing video file.
When you need to combine separate video and audio recordings into a single multi-track file without losing quality through re-encoding.
When preparing dual-audio media files for players that support switching between multiple language tracks.

How it works

1Upload your source video file along with the primary and secondary audio files.
2Select your preferred output container format, either MKV or MP4.
3Specify the language codes and track titles for both audio streams to ensure proper identification in media players.
4Process the files to mux the audio tracks directly into the video container using copy mode.

Use cases

Creating dual-language movies or educational videos with switchable English and Japanese audio tracks.
Adding a director's commentary track as a secondary audio option alongside the main movie audio.
Muxing high-quality external microphone recordings and backup audio tracks into a single video file.

Examples

1. Creating a Dual-Language Anime Episode

Anime Fan Subber

Background

A subber has a high-definition video file of an episode, a Japanese voice track, and an English dub track.

Problem

They need to combine these elements into a single MKV file where viewers can easily switch between English and Japanese audio.

How to use

Upload the raw video file, select the English audio as the primary track, and the Japanese audio as the secondary track. Set the output container to MKV, set the primary language to 'eng' (titled 'English Dub'), and the secondary language to 'jpn' (titled 'Japanese Original').

Output Container: MKV, Primary Language: eng, Primary Title: English Dub, Secondary Language: jpn, Secondary Title: Japanese Original

Outcome

A single MKV video file containing both audio tracks, allowing media players to toggle between the English and Japanese audio streams.

2. Adding Director Commentary to an Indie Film

Indie Filmmaker

Background

A filmmaker has the final cut of their short film and a separate audio recording of the director's commentary.

Problem

They want to distribute the film as an MP4 file containing both the main stereo mix and the commentary track without re-rendering the video.

FAQ

Does this tool re-encode the video or audio?

No, it uses copy mode to mux the tracks, which preserves the original quality and processes the files quickly.

What output formats are supported?

You can export the final dual-audio video as either an MKV or MP4 file.

Can I label the audio tracks with specific languages?

Yes, you can set three-letter language codes (like 'eng' or 'jpn') and custom titles for both tracks.

Is there a file size limit for the uploads?

Yes, the video and audio files must each be under 100 MB.

Can I add more than two audio tracks?

No, this tool is specifically designed to merge exactly one primary and one secondary audio track into the video.

Output Container: MP4, Primary Language: eng, Primary Title: Main Mix, Secondary Language: eng, Secondary Title: Director Commentary

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Inputs

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Creating a Dual-Language Anime Episode

2. Adding Director Commentary to an Indie Film

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