MJPEG to MTS Converter
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Supports: MJPEG
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Need help?Convert MJPEG to MTS Online
A raw .mjpeg (or .mjpg) file is a Motion JPEG stream — a sequence of standalone JPEG frames with no inter-frame compression, which makes it bitrate-hungry and bulky. This converter re-encodes those frames into MTS (the AVCHD camcorder stream: H.264 video in an MPEG-2 Transport Stream), so the same footage usually drops to a fraction of its original size and slots straight into AVCHD camcorders, Blu-ray-style disc authoring, and legacy HD editors. One honest caveat up front: a bare Motion JPEG stream carries no audio, so the MTS comes out with picture but no sound — more on that below.
How to Convert MJPEG to MTS
- Upload Your MJPEG File: Drag and drop your
.mjpegor.mjpgonto the page, or click "+ Add Files" to choose it from your computer. Queue several clips to convert with the same settings. - Pick a Quality Preset: Leave Quality Preset on "Very High (Recommended)", or open the options and switch to Constant Bitrate, Variable Bitrate, Constant Quality, or Constraint Quality to control the H.264 rate yourself. You can also target a Specific file size to cap the output.
- Set Resolution or Trim (Optional): AVCHD is HD-only, so use Preset Resolutions (1920×1080 / 1280×720 / 1440×1080), Resolution Percentage, or Keep original; the Time Range trim exports just the segment you want onto an SD card or disc.
- Convert and Download: Click "Convert" and download your
.mts. No sign-up, no watermark.
MJPEG vs MTS — Why the File Shrinks
| Property | MJPEG (source) | MTS / AVCHD (output) |
|---|---|---|
| Container | Raw stream, no wrapper | MPEG-2 Transport Stream |
| Video codec | Motion JPEG (intra-frame only) | H.264/AVC (Main / High profile) |
| Compression style | Each frame a standalone JPEG | Inter-frame — reuses data between frames |
| Typical file size | Large (intra-only is bitrate-hungry) | Often several times smaller at similar quality |
| Audio | None in the stream | AC-3 or LPCM — but empty if the source had none |
| Resolution | Whatever the camera captured | HD only — 1080p / 1080i / 720p, no 4K |
| Standardized | No single official spec | AVCHD spec (Sony / Panasonic, 2006) |
| Typical source | IP cameras, webcams, surveillance, old digicams | Sony / Panasonic HD camcorders, Blu-ray discs |
Because Motion JPEG stores every frame as a self-contained JPEG and never reuses data between frames, it needs a high bitrate to look good — embedded-vision testing puts raw MJPEG at roughly 5-20× the storage of H.264 for comparable footage. Re-encoding to AVCHD's H.264 is what claws most of that space back.
Frequently Asked Questions
Why does my MTS have video but no sound?
Because a bare .mjpeg is a video-only Motion JPEG stream — it stores JPEG frames and defines no audio track, so there is nothing for the converter to carry into the MTS. The result plays the picture fine but is silent, which is the format behaving exactly as specified, not a converter bug. If your footage was recorded with sound, that audio lived in the container the video came from — an .avi or QuickTime .mov — so convert that instead: AVI to MTS or MOV to MTS read the whole container and keep its audio track.
How much smaller will the MTS be than the MJPEG?
Usually a lot smaller. Motion JPEG uses no inter-frame compression, so it spends a high bitrate keeping every frame self-contained; H.264 — the codec AVCHD requires — reuses data across frames and reaches similar quality at a fraction of the size, often well under half. The exact ratio depends on motion and your Quality Preset: static surveillance footage shrinks the most, fast-moving scenes less. Lower the bitrate or pick a smaller Specific file size to push the output smaller still, at the cost of some detail.
Will converting lose quality, and can I get the original back?
There is a quality cost, and it is one-way. The JPEG compression already baked into every MJPEG frame is lossy and permanent — re-encoding to H.264 cannot recover detail the source never kept, and the H.264 pass itself sheds a little more. Choosing a higher Quality Preset (or a low CRF) keeps the MTS visually close to the source, but a lossy-to-lossy conversion never restores quality that was already discarded upstream. Keep your original .mjpeg if you may need to re-encode later.
Can my Sony or Panasonic camcorder play the converted MTS?
If the camcorder supports AVCHD ingest — most Sony Handycam and Panasonic HC-series bodies do — copy the .mts into the SD card's PRIVATE/AVCHD/BDMV/STREAM/ folder and it should appear. The output already targets AVCHD's required H.264 video. Stay at 1080p or 720p, since AVCHD is HD-only and older bodies reject 4K or off-spec resolutions; some camcorders also need their index files rebuilt, which a manufacturer utility usually handles.
I mainly want a file that plays everywhere — should I use MP4 instead?
Probably, yes. MTS / AVCHD is the right target only if you specifically need camcorder ingest, AVCHD disc authoring, or a legacy HD editor that demands it. For footage you just want to play on phones, browsers, and modern players, MJPEG to MP4 follows the same H.264 efficiency upgrade in a far more universal container. Going the other direction — pulling editable frames back out of an AVCHD clip — is MTS to MJPEG.
How are my files handled, and are they kept private?
Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion — never shared or made public. There is no sign-up and no watermark.