ERF to FLV Converter

Converting ERF to FLV: What This Tutorial Covers

This page walks you through turning an Epson R-D1 RAW photo (an ERF still) into an FLV — Adobe's Flash Video container. Before you start, know two things: an ERF is a single RAW still, so the FLV holds one rendered frame as a short silent clip with no motion; and FLV is a retired format whose host, Flash Player, reached end of life on December 31, 2020. If you only want a viewable photo from your R-D1, convert ERF to JPG; if you need a clip that plays everywhere, ERF to MP4 is far better than dead FLV. Choose FLV only when a legacy Flash-era pipeline specifically demands the .flv extension.

How to Convert ERF to FLV

1. Upload Your ERF File: Drag and drop your R-D1 file onto the page or click "+ Add Files". RAW files are large, so the main wait is the upload, not the conversion; you can queue several at once.
2. Set Merge strategy and Image Duration: Choose Merge images to combine multiple ERFs into one FLV, or Video per image for a separate clip each. Then set Image Duration (default 5 seconds per frame) to control how long each photo stays on screen.
3. Pick Background Color, Quality Preset, and Video resolution: Background Color (default Black) fills letterbox bars when the photo's aspect ratio differs from the video frame. Leave the Quality Preset on Very High (Recommended), and use Video resolution to cap the output size. To carry a modern codec, open Video Codec and switch from the default to H.264.
4. Convert and Download: Click "Convert" and download your FLV. No sign-up, no watermark. The clip is silent by design.

Walk-through: choosing the FLV video codec

The single decision that matters most on this page is which codec goes inside the .flv container, because FLV supports several and they age very differently:

• If a legacy Flash tool needs a "true" FLV (an old Flash authoring environment, a SWF pipeline, or an FLV player): leave the default FLV codec. That is FLV1, also known as Sorenson Spark — a proprietary variant of the H.263 video standard and the codec Flash Player 6 and 7 required. It is the most "authentic" FLV but the oldest and lowest quality.
• If you just need the .flv extension on a watchable file: open the Video Codec menu and pick H.264. Adobe added H.264 support in Flash Player 9 Update 3 (December 3, 2007), so a modern .flv can carry it, and H.264 gives a far better quality-to-size ratio than Sorenson Spark. VLC and ffmpeg play both.
• Either way the clip is silent. An ERF is a still photo with no audio, so the converter writes no audio track and hides the audio codec for image sources — there is nothing to fill it.

Because demosaicing an ERF bakes in white balance, exposure, and tone, and the frame is then scaled down to a video resolution, treat the FLV as a one-off delivery file and keep the original ERF as your master.

Common Errors and How to Fix Them

• "The FLV won't open / nothing happens when I double-click it" — Browsers and operating systems no longer ship Flash, so most default apps cannot open an FLV. Play it in VLC, which decodes FLV (Sorenson Spark, VP6, and H.264) without extra plug-ins.
• "The video is just one frozen image" — That is expected. A single ERF is one still, so a single-file conversion is a freeze-frame held for your Image Duration. To get a sequence, upload several ERFs and choose Merge images; even then there are no transitions, just each photo in turn.
• "There's no sound" — Also expected. A still photo carries no audio, so the FLV is video-only by design. Add a soundtrack afterward in a video editor if you need one.
• "The photo looks soft or cropped" — Even a 6.1-megapixel R-D1 frame is larger than a standard-definition video frame, so it gets scaled down. Raise the Video resolution preset, or convert ERF to JPG to keep full photo resolution.
• "Colors or exposure look off" — The demosaic step locked in a generic render. Develop the ERF in a RAW editor (Lightroom, RawTherapee, darktable) first, export, then convert.

When This Doesn't Work

FLV is the wrong target for almost every modern goal. Flash Player reached end of life on December 31, 2020, and Adobe began blocking Flash content on January 12, 2021, so an .flv will not embed in a web page or play in a browser the way it did in the Flash era. If your real aim is a shareable clip, convert ERF to MP4 for H.264 that plays on phones, browsers, and editors; if you want a normal viewable photo — what most R-D1 owners actually need — convert ERF to JPG. Use FLV only when a specific legacy Flash-era workflow refuses anything but the .flv extension. Note too that DRM-protected or corrupted RAW files cannot be rendered, and a single still can never become true motion footage.

Frequently Asked Questions

What is ERF, and why do so few tools convert it to video?

ERF stands for Epson RAW Format, the proprietary RAW file written by the Epson R-D1 — introduced in March 2004 as the first commercially produced digital rangefinder, a Leica M-mount camera aimed at film shooters moving to digital. Only the R-D1 and its successors, the R-D1s (March 2006) and the Japan-only R-D1x / R-D1xG (April 2009), ever wrote ERF, and Epson then left the camera business, so no other body uses it. Because an ERF is a single RAW still, most converters only offer image outputs like JPG; turning one into a video at all is unusual. ERF is TIFF/EP-based, so the files still open in Adobe Lightroom, RawTherapee, darktable, and the dcraw / libraw decoders this tool relies on.

Should I really convert ERF to FLV, or to JPG or MP4 instead?

For almost every purpose, no. This pairing mismatches three ways at once: a RAW still becomes a video, a high-quality archival photo becomes a consumer clip, and the target is a dead Flash container. To view, print, or share the photo, convert ERF to JPG. If you need a playable clip, ERF to MP4 produces H.264 that plays on phones, browsers, and modern editors. Choose FLV only when a legacy Flash-era tool insists on the .flv extension.

Which codec does the FLV output use, and can I change it?

By default the video uses the FLV codec — FLV1, also known as Sorenson Spark, a proprietary variant of the H.263 standard that was the original Flash Video codec required by Flash Player 6 and 7. Under the Video Codec menu you can switch to H.264, which Adobe added to Flash in Player 9 Update 3 (December 3, 2007) and which gives much better quality for the same size. Both play in VLC and ffmpeg. Because the source is a single still, no audio codec is offered and the clip is silent.

Will my FLV even play, now that Flash is gone?

Not in a browser the way it once did. Adobe ended support for Flash Player on December 31, 2020, and began blocking Flash content on January 12, 2021, so an .flv no longer embeds in web pages or plays through the old plug-in. It still plays in standalone players that bundle their own decoders — VLC and ffmpeg open FLV directly. If you need broad, future-proof playback, use ERF to MP4 instead.

Will I lose image quality going from RAW ERF to FLV?

Yes, substantially, and that is inherent. An ERF holds 12-bit unprocessed data from the R-D1's Bayer-pattern CCD that must be demosaiced to become viewable; that render bakes in white balance, exposure, and tone — the editing latitude that is the whole reason to keep RAW. Even a 6.1-megapixel R-D1 frame exceeds a standard-definition video frame, so it is scaled down, and the FLV codec adds lossy compression on top — the default Sorenson Spark especially, as an older codec. Keep the original ERF as your master and treat the FLV as a one-off delivery file.

What happens to my uploaded ERF file after conversion?

Your file is uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after the conversion — no sign-up, no watermark, never shared or made public. In our testing, a single 6.1-megapixel R-D1 ERF held for 5 seconds produced a short, silent FLV of roughly 1-2 MB, since one repeated frame compresses efficiently.