MTS to MJPEG Converter

MTS to MJPEG Converter

MTS is the AVCHD camcorder format — H.264 video with AC-3 or PCM audio in an interframe-compressed stream. A raw MJPEG (.mjpeg) file is the opposite: every frame is stored as an independent JPEG, with no interframe compression and no audio track. This conversion exists for a narrow set of jobs — frame-accurate scrubbing, per-frame editing, and machine-vision or capture pipelines that decode one JPEG per frame. If you just want a smaller, shareable clip with sound, convert MTS to MP4 instead; MJPEG will make your file much larger and drop the audio.

MTS (AVCHD) Format at a Glance

MJPEG (Motion JPEG) Format at a Glance

Why This Conversion Is "Backward" — and When It Still Makes Sense

Going from H.264 to MJPEG abandons interframe compression. H.264 stores most frames as differences from their neighbors; MJPEG stores every frame in full as a JPEG. At the same visual quality, an MJPEG file is typically much larger than the original MTS — you are trading efficiency for per-frame independence. Two more honest caveats: the audio is discarded (raw MJPEG carries no track, so the camcorder's AC-3 or PCM sound is dropped), and the result is lossy-on-lossy — each frame is re-encoded as a JPEG on top of H.264's existing compression.

It is still the right move when per-frame access matters more than file size: every frame is a complete image, so seeking, scrubbing and cutting are exact without decoding neighboring frames. That suits frame-accurate editing tooling and machine-vision or capture pipelines that read one JPEG per frame. For everything else — sharing, archiving, playback — keep a container with audio via MTS to MP4 or MTS to AVI.

How to Convert MTS to MJPEG

1. Upload Your MTS File: Drag and drop your .mts clip onto the page, or click "+ Add Files" to pick it from your computer. Multiple files convert with the same settings.
2. Set the Quality Preset: Open Advanced Options and choose a Preset under Quality Preset — "Very High (Recommended)" keeps frames sharp, while lower presets shrink the output. This controls the per-frame JPEG quality.
3. Adjust Video Resolution (Optional): Use Resolution Percentage, a preset under Preset Resolutions, or a custom Width × Height to scale frames down and tame MJPEG's larger file size. Leave it on "Keep original" to preserve the source dimensions.
4. Convert and Download: Click "Convert" and download your .mjpeg stream. No sign-up, no watermark.

Frequently Asked Questions

Why are my MJPEG files so much bigger than the original MTS?

Because MJPEG drops interframe compression. The MTS source uses H.264, which stores most frames as small differences from neighboring frames. MJPEG stores every frame in full as an independent JPEG, so at a comparable quality the file is typically several times larger. Lowering the Quality Preset or the resolution reduces the size, at the cost of per-frame detail.

Does the MJPEG file keep the audio from my camcorder clip?

No. A raw .mjpeg stream is video-only, so the AC-3 or linear PCM audio in your AVCHD clip is discarded during conversion. If you need to keep the sound, convert to a container format instead — MTS to MP4 or MTS to AVI both carry a video and an audio track.

Will I lose quality converting MTS to MJPEG?

Some, yes. The conversion is lossy-on-lossy: the H.264 video in your MTS file was already compressed, and each frame is re-encoded as a JPEG on top of that. A high Quality Preset keeps the loss small and hard to notice, but MJPEG is not lossless and will not recover detail that H.264 already discarded.

Is there a single official MJPEG specification this outputs?

No — there is no document universally recognized as the complete Motion JPEG specification. Microsoft defines an MJPEG variant for AVI, Apple defines one for QuickTime, and RFC 2435 defines MJPEG over RTP. This tool outputs a raw .mjpeg elementary stream — a plain sequence of JPEG frames — which is the most portable form for editing and machine-vision tools that read frames directly.

What software plays a raw .mjpeg file?

Frame-oriented players and editors handle it well — VLC, FFmpeg/ffplay, and most non-linear editors open raw MJPEG, and many machine-vision libraries decode it directly. General-purpose consumer players and browsers may not, because a raw .mjpeg has no container or audio. If you need broad playback, use MTS to MP4 instead.

When should I just convert MTS to MP4 instead?

For nearly everything that is not frame-by-frame work. If your goal is a smaller file, easy sharing, sound, or playback on phones and browsers, MTS to MP4 keeps H.264's efficiency and your audio. Reserve MJPEG for frame-accurate editing and pipelines that genuinely need one independent JPEG per frame. Going the other way, convert MJPEG to MTS re-wraps a Motion JPEG source into an AVCHD-style stream.

How are my uploaded files handled?

Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion — no sign-up, no watermark, never shared or made public. In our testing, a 30-second 1080p MTS clip converted to a raw .mjpeg stream noticeably larger than the source, which is expected behavior when interframe compression is removed.