MikuVideo

The modern video tool for MikuMikuDance users.

MMD renders video as AVI files — huge, uncompressed, and not directly uploadable to YouTube. MikuVideo bridges that gap: convert, sync audio, and inspect your render frame by frame, all in one place.

Download MikuVideo

Features

Convert AVI to MP4 - Why this is useful

MMD outputs AVI/UtVideo or AVI/raw files. MikuVideo converts them to MP4 — dramatically smaller files, ready to upload to YouTube or share anywhere.
You can send any video format to YouTube — they have the best converter in the world. But large files mean large upload times and high data consumption, especially on a mobile data plan.

Quality	30 seconds
4K AVI / Raw	4000 MB (4 GB)
4K AVI / UtVideo	400 MB
4K MP4	40 MB

Audio sync

Add a WAV or MP4 audio track to your video, with a frame-offset control to align the music perfectly with your animation.

Frame-by-frame inspection

Review your render frame by frame with zoom up to 2000% (4000% for 4K content). Catch clipping, z-fighting, or rigging issues before publishing. Frame position is compatible with MMD frame.

Playback modes

Slow motion — 4 fps for detailed review
Fast playback — 60 fps for quick scrubbing
Frame display — shows MMD frame numbers (@30Fps) and H:M:S timecode side by side

Audio extraction

Export the audio track of any video as a WAV file at 44,100 Hz — the format MMD accepts for background music.

Export to AVI/MMD

Convert any video format to AVI format for use as a background video or on virtual screens inside MMD.

Why MikuVideo?

Problem	Solution
AVI files are too large to share	Convert to MP4 in one click
Audio is out if not start frame 0	Add audio with frame-offset adjustment
Hard to spot animation errors	Zoom in and step through frame by frame
Need audio extracted from a video	Export WAV directly
Need video on background for Motion Trace or Screen	Convert in one click
Tired of bloated software full of ads	MikuVideo is completely free and ad-free

Technical details

Built with C# (.NET / Visual Studio)
Uses FFmpeg (LGPL) for encoding and conversion
MikuVideo is independent of MikuMikuDance — no MMD installation required
Help of MikuVideo

System requirements

Windows 10 or 11 (x86/64-bit)
No additional installation required — FFmpeg is bundled

FAQ - Frequently asked questions

Is it free?

Yes, completely free, no registration or ads.

Does it work on 32-bit Windows, Arm, Linux, Android, Apple ?

No. MmdStart requires a x86/64-bit version of Windows 10 or 11.

Can I uninstall?

Yes. Use windows Settings>Apps>Installed apps to remove MikuVideo

Need to install MikuMikuDance first?

MmdStart installs MMD and all its dependencies in one click — no manual setup.

Get MmdStart