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Need help?MOS to MPEG Converter
A MOS file is a Leaf medium-format camera RAW photo — a single still image, not a video. Converting it to MPEG wraps that one frame in an MPEG-2 video clip that holds the image on screen for a set duration. This is the right choice when you specifically need a video file (for a player, a timeline, or a kiosk loop); if you just want a normal, openable photo, convert MOS to a still image instead.
Is MOS to MPEG What You Actually Want?
MOS holds wide-latitude raw sensor data at high bit depth. MPEG is an 8-bit lossy video format, so the conversion bakes the raw down to standard video range — you lose the editing headroom that made the RAW useful. Two honest paths:
- You need a still photo (sharing, printing, archiving, editing): use MOS to JPG for a universally openable image, or MOS to TIFF to keep more detail. Most people want this.
- You genuinely need a video clip of that frame (a freeze-frame intro, a slate, a single-image loop): MOS to MPEG is correct. The output is a silent clip — image-to-video conversions carry no audio track.
MOS Format at a Glance
| Property | Value |
|---|---|
| Type | Raw still image (single frame) |
| Origin | Leaf medium-format digital backs (later Leaf/Mamiya Aptus) |
| Container | Based on TIFF / EXIF structure |
| Payload | Uncompressed or lossless-compressed raw sensor data, high bit depth |
| Opens in | Capture One, Adobe Camera Raw / Lightroom, RawTherapee |
| Best converted to | JPG / TIFF / PNG for a photo; MPEG / MP4 only when a video is required |
MPEG (MPEG-2) Format at a Glance
| Property | Value |
|---|---|
| Standard | ISO/IEC 13818 (MPEG-2) |
| First published | 1996 |
| Video codec (xconvert default) | MPEG-2, lossy |
| Audio | MP2 in the program stream — but image-to-video output is silent |
| Bit depth | 8-bit |
| Best for | DVD-Video, broadcast, legacy players that expect an MPEG program stream |
How to Convert MOS to MPEG
- Upload Your MOS File: Drag and drop your
.mosfile onto the page or click "+ Add Files" to browse from your computer. - Set Image Duration: Use the Image Duration dropdown to choose how long the still frame is held on screen (default is 5 seconds per frame) — this sets the length of the output clip.
- Adjust Quality, Background, and Resolution (Optional): Pick a Quality Preset (Very High is recommended), set the Background Color used to pad non-matching aspect ratios, and choose a Resolution under Advanced Options. The output uses the MPEG-2 video codec by default.
- Convert and Download: Click "Convert" and download your MPEG file. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark.
Frequently Asked Questions
Why is my converted MPEG video silent?
Because a MOS file is a still photo with no sound. Image-to-video conversions produce a video track only — there is no audio to carry over, so the resulting MPEG clip is silent by design. If you need a soundtrack, add one afterward in a video editor.
Will I lose image quality converting MOS to MPEG?
Yes, some. MOS stores high-bit-depth raw sensor data; MPEG-2 is an 8-bit lossy video format. The wide tonal latitude that makes RAW useful for editing is baked down during conversion. For a high-fidelity still you can edit, convert MOS to TIFF instead.
Should I convert MOS to MPEG or to a photo format?
If your goal is to view, share, print, or edit the picture, convert to a photo format — MOS to JPG is the most compatible. Choose MPEG only when a downstream tool, player, or workflow specifically requires a video file rather than an image.
How long is the output MPEG clip?
It equals the Image Duration you set multiplied by the number of frames. With a single MOS file at the default 5 seconds per frame, you get a 5-second clip. Raise or lower the duration to make a longer or shorter freeze-frame video.
Can I merge several MOS files into one MPEG video?
Yes. Upload multiple MOS files and use the Merge strategy option set to "Merge images" to combine them into a single MPEG slideshow, each frame shown for the Image Duration you chose. Choose "Video per image" to get a separate clip per file instead.
Should I choose MPEG or MP4 for the clip?
MP4 (H.264) for almost anything you will actually watch or share — it produces smaller, sharper files and plays natively on modern phones, browsers, and TVs. The MPEG output here uses MPEG-2, a 1990s DVD-era codec with larger files and patchy support outside dedicated players like VLC. Pick MPEG only when a DVD-authoring tool, set-top box, or legacy system specifically needs an MPEG program stream; otherwise convert MOS to MP4 instead.
Which cameras and software produce MOS files?
MOS is the raw format written by Leaf medium-format digital backs — the Leaf Aptus and later Leaf/Mamiya and Phase One (Credo) backs used on studio and landscape cameras. Because it is a proprietary Leaf RAW rather than a standard image, it opens in Capture One, Adobe Camera Raw / Lightroom, and RawTherapee, but not in ordinary photo viewers. That limited reach is the usual reason people convert a MOS at all — to a still image for viewing, or, in the rare case a workflow needs video, to an MPEG clip.
Is the conversion private?
Yes. Your MOS file is uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours. Files are never shared or made public, and there is no sign-up or watermark.