MOS to MOV Converter

Convert MOS to MOV Online

Turn a Leaf medium-format raw photograph into a QuickTime MOV clip that holds the developed frame on screen for as long as you choose. The converter demosaics the .mos, applies white balance and a standard tone curve to make it viewable, then encodes that single frame as H.264 inside a MOV container — the format Final Cut Pro, Premiere and iMovie ingest without complaint. It is silent and motionless by nature, because a raw photograph contains neither sound nor motion, and that is the point: this is how you get a still onto a video timeline.

How to Convert MOS to MOV

1. Upload Your MOS File: Drag and drop your .mos onto the page or click "+ Add Files". Queue several backs at once and they convert with the same settings; the upload is the slow part with medium-format files.
2. Set the Image Duration: Image Duration controls how long the frame is held, and therefore the length of the clip. It defaults to 5 seconds per frame and runs from a single frame at 60 fps up to 10 seconds per frame.
3. Choose the Codec, Quality and Background (Optional): Video Codec defaults to H.264. Quality Preset defaults to Very High (Recommended). Background Color defaults to White and fills any padding. Video resolution starts on Keep original.
4. Convert and Download: Click "Convert" and save the MOV. Files upload over an encrypted connection, are processed on our servers, and are deleted automatically after a few hours. No sign-up, no watermark.

Codec Choice and Which Quality Control Actually Works

The MOV target exposes eighteen video codecs, and the File Compression controls do not behave identically across them. We walked the option surface codec by codec; this is what each combination actually gives you:

The practical rule is short: stay on H.264 unless something downstream demands otherwise, and Quality Preset will do exactly what it says. If you must use one of the legacy codecs, switch to Constraint Quality and set a Max bitrate, because that is the mode that genuinely constrains those encoders.

What the MOV Actually Contains

Picking a Duration

The duration is the only setting that changes the shape of the result, because everything else is a single fixed picture. Choose it for where the clip is going. A fraction of a second up to one second gives you a stinger or a cut-in you can drop between shots. Three to five seconds reads as a deliberate hold — a title card, an establishing still, a beat to let the image land. Up to ten seconds suits a slideshow segment or a frame you intend to narrate over. If you need longer than ten seconds, pick a comfortable length here and extend or loop the clip on your editor's timeline; since there is no audio to stay in sync with, looping a still is free.

Uploading several .mos files at once brings the Merge strategy control into play. Merge images is the default and strings every frame into one clip, each held for the duration you set. Video per image gives you a separate MOV per frame instead.

Frequently Asked Questions

Why does the MOV show a still image instead of playing video?

Because a MOS file is a photograph. There is no motion recorded anywhere in it, so the clip holds one developed frame for the duration you chose. The file is a completely valid MOV and every player will open it — there is simply nothing moving to display. This is expected behaviour, not a failed conversion.

Why is there no audio track?

A raw photograph carries no sound, so the converter writes no audio stream. On this page the audio codec controls are hidden from the interface entirely rather than being set to silence, which is the honest reflection of a source that has nothing to encode. Add music or voiceover on the timeline after you import the clip.

Which codec should I choose for Final Cut Pro or Premiere?

Leave it on H.264. That is the default, it is what both applications ingest most reliably, and it is one of only two codecs on this page where the Quality Preset control actually does anything. H.265 also works with Quality Preset and produces a smaller file, but it decodes more slowly on a timeline and gains you nothing on a single-frame clip, since H.265's advantage comes from predicting motion between frames.

Why doesn't the clip keep my back's full resolution?

Images are capped at 4096 pixels on the long edge before encoding, so an 80-megapixel Leaf frame — around 10000 pixels wide — is downscaled before the encoder ever sees it. Whatever you set under Video resolution then applies on top of that. This is not adjustable. If you need the full pixel count, the video path is the wrong one; export the frame with MOS to PNG or MOS to TIFF instead.

Where do the white bars around my image come from?

From the Background Color option, which defaults to White for image sources. Medium-format backs shoot close to square or 4:3, so asking for a 16:9 output pads the sides to fill the frame. You can choose a different colour from the 25 available, pick a fixed resolution matching your frame's proportions, or leave Video resolution on Keep original so no padding is needed at all.

Does the converter develop the raw the way Capture One would?

No, and it is worth being clear about the difference. It applies a neutral standard development — demosaic, as-shot white balance, standard tone curve — with none of your profile or recipe attached. There is also no HDR tone-mapping stage, so a frame you exposed to protect a bright sky may clip where your own workflow would have recovered it. For colour-critical work, develop in Capture One first, export a rendered TIFF or JPG, and convert that file.

Should I use MOV or MP4 for this?

MOV if the clip is going into Final Cut Pro or another Apple-centric workflow, which is the container those tools were built around. MOS to MP4 if the clip is going onto the web, into a browser, or onto a phone, since MP4 is the more universally accepted wrapper. The two are closely related — the ISO base media file format that MP4 is defined on was derived from QuickTime — so the underlying H.264 video is identical either way.

What happens to my MOS file after conversion?

It is uploaded over an encrypted connection, developed and encoded on our servers, and both the uploaded raw and the finished clip are deleted automatically after a few hours. No sign-up, no watermark, and nothing you upload is shared or made public. Keep the original .mos — encoding to video discards the raw's editing latitude along with most of its resolution, so the MOV is a delivery file rather than an archive.