MOS to MPEG-2 Converter
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Supports: MOS
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Need help?MOS to MPEG-2 Converter
A .mos file is a Leaf Camera RAW still — the unprocessed 16-bit sensor capture written by Leaf Aptus and Leaf Valeo medium-format digital backs. MPEG-2 (ISO/IEC 13818, also designated ITU-T H.262) is a moving-picture video standard, so this conversion does not just re-save a photo: it demosaics the RAW capture, flattens it to an 8-bit frame, and wraps that single frame into a short, silent MPEG-2 video clip. There is no animation and no audio — you set how many seconds the still should hold on screen, and the tool encodes that as video. The realistic reason to want this is DVD-authoring or feeding a still into an MPEG-2 editing timeline; if you only want a viewable photo, convert MOS to a standard image instead (see the cross-links below).
MOS Format at a Glance
| Property | Value |
|---|---|
| Full name | Leaf Camera RAW (Mamiya Leaf .mos) |
| Type | Sensor RAW still image (not video, not a finished photo) |
| Developed by | Leaf Imaging — Leaf Aptus / Aptus-II and Leaf Valeo digital backs |
| Bit depth | 16-bit linear sensor data (uncompressed or compressed RAW) |
| Typical size | ~21–115 MB per frame depending on back and compression |
| Opens in | Capture One, Leaf Raw Converter, Adobe Camera Raw / Lightroom (uncompressed) |
| Best for | Maximum tonal latitude for raw editing before export |
MPEG-2 Format at a Glance
| Property | Value |
|---|---|
| Standard | ISO/IEC 13818-2 (H.262), first published 1996 |
| Type | Lossy video codec / program-stream container |
| DVD-Video profile | Main Profile @ Main Level, 720×480 (NTSC) or 720×576 (PAL) |
| Bitrate | Up to 9.8 Mbit/s video peak on DVD-Video |
| Color depth | 8-bit per channel, 4:2:0 chroma |
| Browser playback | Not natively decoded by Chrome, Firefox, Safari, or Edge |
| Best for | DVD-Video, broadcast, and legacy editing-timeline source |
How to Convert MOS to MPEG-2
- Upload Your MOS File: Drag and drop your
.mosfile or click "+ Add Files." You can queue several frames; each is encoded independently unless you change the merge strategy. - Set Image Duration and Background Color: Pick how long the still holds on screen (the default is 5 seconds per frame) and the padding color used when the frame's aspect ratio does not match the output — Black is the default.
- Choose Quality Preset and Resolution: Select a Quality Preset (Constant Quality with a preset such as "Very High") and a Video Resolution — keep the original dimensions, or pick a fixed/preset size like 720×480 if you are targeting DVD-Video.
- Convert and Download: Click "Convert" and download the silent MPEG-2 clip. No sign-up, no watermark.
Why This Conversion Loses Some of the RAW
A Leaf MOS holds 16-bit linear sensor data with far more tonal range than any 8-bit video frame can display. During conversion the RAW is demosaiced and tone-mapped down to MPEG-2's 8-bit, 4:2:0 frame, so highlight and shadow latitude that you would normally recover in Capture One is baked in permanently. MPEG-2 is also older and less efficient than H.264/AVC or H.265/HEVC, so the file is larger than a modern codec would produce at the same quality. Because of this, MPEG-2 is worth choosing only when a downstream tool specifically needs it — DVD authoring or an MPEG-2 timeline. For everything else, exporting the RAW to a high-quality image preserves more detail.
Frequently Asked Questions
Will the MPEG-2 file I get be a playable DVD?
No. This produces a bare .mpeg2 elementary/program stream, not a finished disc. A DVD-Video disc needs a VIDEO_TS folder with IFO/BUP navigation files and the video remuxed into VOB. Use this output as the source you feed into DVD-authoring software, or convert MOS to VOB (MOS to VOB) to get the DVD container directly.
Does the MPEG-2 clip have sound?
No. A MOS file is a single still image with no audio track, so the resulting clip is silent. The tool simply holds your frame on screen for the duration you set; there is nothing to encode an audio stream from.
Why convert a RAW photo to video at all instead of an image?
The only practical reasons are DVD-Video authoring and dropping a still onto an MPEG-2 editing timeline that expects video, not images. If you just want a shareable, viewable photo, convert to a standard image instead — MOS to JPG for a small file or MOS to PNG for lossless quality.
Will I lose image quality going from MOS to MPEG-2?
Yes, some. The 16-bit RAW is demosaiced and reduced to an 8-bit, 4:2:0 MPEG-2 frame, and MPEG-2's lossy compression discards further detail. Use the highest Quality Preset and keep the original resolution to minimize visible loss, but the RAW's full editing latitude cannot survive the trip.
What resolution should I pick for DVD-Video?
Standard DVD-Video uses MPEG-2 Main Profile at Main Level — 720×480 for NTSC regions or 720×576 for PAL — at up to 9.8 Mbit/s. Choose the matching Fixed Resolution preset so your authoring software does not have to rescale the frame.
Is my file kept private during conversion?
Your MOS file is uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours. There is no sign-up, no watermark, and files are never shared or made public. In our testing, a single Leaf Aptus-II frame held for 5 seconds encodes to a small MPEG-2 clip in well under a minute once the upload finishes.