3FR to AV1 Converter

Convert 3FR to AV1: What This Tutorial Covers

A .3fr file is a Hasselblad medium-format raw still, and AV1 is a video codec — so this is a still-to-video job, not a photo-to-photo one. The result is a short, silent AV1 clip that holds your rendered frame on screen for a length you choose, wrapped in a Matroska container that carries a .av1 name. This walk-through covers the three settings that decide what you get, the playback quirk that catches everyone out, and when you should be converting to a still format instead.

How to Convert 3FR to AV1

1. Upload Your 3FR File: Drag and drop your .3fr onto the page or click "Add Files". You can queue several Hasselblad frames and convert them under one set of settings.
2. Set Image Duration: Under Advanced Options, Duration decides how long the frame is held — it starts at "5 seconds per frame" and ranges from a fraction of a second up to 10 seconds.
3. Pick Quality Preset and Resolution (Optional): Leave the Quality Preset on "Very High (Recommended)", or switch File Compression to Constant Quality and set the AV1 CRF yourself, where the control starts at 30 on a 16-63 scale. Video resolution defaults to "Keep original"; use "Fixed Resolutions" (for example 1920 x 1080) to bring a medium-format frame down to a normal video size.
4. Convert and Download: Click convert and download the file. It uploads over an encrypted connection, is encoded on our servers, and is deleted automatically after a few hours — no sign-up, no watermark.

What the .av1 File Actually Contains

Walk-through: Getting a File That Actually Plays

The surprise in this conversion is the file name, not the codec. The bytes we write are ordinary Matroska carrying an AV1 video track, but the .av1 extension is not a container name anyone standardised — AV1 is normally delivered inside MP4, WebM, or MKV, and most players and browsers decide what to do from the extension before they ever look inside the file.

• If you just want it to play: open it in VLC, mpv, or ffplay, which read the container rather than the name. For anything else, rename the file to .mkv — the bytes do not change — or convert it with AV1 to MP4 or AV1 to WebM, both of which re-encode rather than repackage.
• If you want a longer hold: raise Duration before converting. A longer clip is more identical frames, and AV1's inter-frame prediction encodes repeats very cheaply, so the file grows far less than the runtime suggests.
• If the picture looks flat: that is the raw render, not the codec. A 3FR carries 16 bits per channel of highlight and shadow latitude; making it viewable bakes white balance, exposure and tone into 8-bit video. Do any recovery in a raw editor first.
• If there are white bars: the photo's aspect ratio does not match the Fixed Resolution you chose. Either go back to "Keep original" or change the Background Color, which fills the letterbox bars and defaults to White.

Common Errors and How to Fix Them

• "Codec not supported: av01" or a black window — the player has no AV1 decoder. Update to a current VLC or mpv build, or re-encode to MP4 with H.264 for a player that will never learn AV1.
• The file will not open at all, in any player — the .av1 extension is being rejected before the container is read. Rename it to .mkv and try again.
• The video has no sound — correct and unavoidable. Our image-to-video pipeline hides the audio codec control entirely for still-image sources, so the muxer writes a video-only file. Add a soundtrack afterwards in an editor.
• Highlight detail has vanished — the raw's latitude does not survive an 8-bit video encode. Recover highlights in Phocus or Lightroom first, or keep a still with 3FR to PNG.
• The output is enormous — "Keep original" kept the full medium-format frame size. Pick a Fixed Resolution; no video pipeline needs a 100-megapixel frame.

Choosing the Right Target for a Hasselblad Raw

When This Doesn't Work

If all you ever wanted was a picture — to edit, print, email, or post — AV1 is the wrong target and hands you a playback problem you did not have. Convert to a still format instead. AV1 output earns its place only when the Hasselblad frame has to live inside a video timeline, an AV1 encoding pipeline, or a montage; and even then, plan to rename the result to .mkv or re-encode it before you hand it to anyone else.

Frequently Asked Questions

Why is my converted AV1 file silent?

Because a 3FR is one still photograph and carries no audio. On image-to-video conversions the Audio Codec control is hidden rather than set to "none", so the encode never even offers you a track to fill — the muxer writes video only. That is correct behaviour for this pairing, not a dropped stream. If the clip needs sound, add it afterwards in a video editor.

Will the .av1 file play in my browser or in VLC?

VLC and mpv open it; browsers generally do not. The file is AV1 video inside a Matroska container that we name .av1, and browsers expect AV1 delivered in MP4 or WebM. VLC gained AV1 decoding in the 3.0.4 update, so anything current handles the stream, and older builds report "codec not supported: av01". For dependable playback anywhere, rename to .mkv or convert with AV1 to MP4.

Does converting 3FR to AV1 keep the raw's dynamic range?

No. A 3FR stores 16-bit-per-channel sensor data, which is what gives Hasselblad files their highlight and shadow recovery headroom. The clip we write is standard 8-bit video, so that headroom is baked off the moment the frame is rendered — the same thing happens exporting a JPEG. Do exposure, white balance and highlight work in a raw editor before converting, and keep the .3fr as the master.

How long is the clip, and what changes its length?

Duration alone. Each image is held for the Duration you set — 5 seconds per frame by default, adjustable from a fraction of a second to 10 seconds — so a single upload gives you a clip of exactly that length. Upload several 3FR files with Merge strategy on "Merge images" and you get one clip of duration times frame count; switch it to "Video per image" to get a separate file per raw instead.

Is AV1 actually better than H.264 or HEVC for a single still?

For video in general AV1 wins on efficiency: MDN puts it at higher compression than VP9 and HEVC, and as much as 50% higher than H.264, with royalty-free licensing that HEVC does not offer. For one held frame that advantage largely evaporates — there is almost nothing to predict across time, so the codecs converge — while AV1's slower encoding and thinner player support remain. If the file is going to a person rather than a pipeline, MP4 is the more practical share.

Can I make an actual slideshow from several Hasselblad frames?

Yes. Upload the set, leave Merge strategy on "Merge images", and each raw becomes one held frame in a single clip, in upload order, with Duration deciding how long each stays on screen. There are no transitions or motion — it is a hard cut between stills. If you want each capture as its own file instead, set Merge strategy to "Video per image" before converting.

Why does the frame get letterboxed with white bars?

Because a medium-format capture is usually 4:3 and the video resolution you picked is usually 16:9, so the encoder pads the sides. The Background Color control chooses the pad colour and starts on White. Two ways out: leave Video resolution on "Keep original" so the frame keeps its own shape, or choose a Fixed Resolution closer to 4:3, such as 1024 x 768 or 1280 x 1024.

What happens to my 3FR file after the conversion?

It is uploaded over an encrypted connection, rendered and encoded on our servers, and deleted automatically a few hours later — no sign-up, no watermark, never shared or made public. Hasselblad raws are large, so the upload is normally the slowest part of the job; that transfer time, not anything on the encoding side, is what you are waiting on.