Lazaclip

ZV-E1 RSV file: recovering a clip that didn't save

Updated 7 November 2026

The ZV-E1 switched off in the middle of a vlog, a review or a long take on a tripod: the battery ran out, the power bank cable came loose, or the card came out too early. The clip isn't where you expect it, and on the card there is a file ending in .RSV. This guide explains what that file is and how to get the video back as a normal .MP4.

Why the clip is an .RSV

While the camera records, it writes the video and sound into a working file with the .RSV extension. When you stop recording, it writes the index (the list of where every frame and every piece of audio is) and renames the file to .MP4. If the power goes first, that never happens. The recording is in the file, but players can't read it without the index. Background: What is an RSV file?

The ZV-E1 records XAVC S and XAVC HS (and, depending on settings, XAVC S-I) into .MP4 files, so an interrupted clip in any of these formats ends up as an .RSV.

If you move clips with your phone

Many ZV-E1 owners send clips to a phone with a companion app. The interrupted recording is not a finished video, so it most likely won't show up there, and the camera's playback may not show it either. That doesn't mean it is lost. To see and copy the .RSV, put the card into a card reader on a computer.

Keep the card safe

  • Don't format the card, in the camera or anywhere else.
  • Don't record your retake on the same card. The ZV-E1 has a single SD slot, so this card holds the only copy of the clip. Use another card for the retake.
  • Don't delete the .RSV.
  • Copy it to a computer. Open the card in File Explorer and copy the whole PRIVATE folder. Video files are in PRIVATE/M4ROOT/CLIP; photos are in DCIM.

Try the camera first

Some Sony cameras try to recover an interrupted clip on their own when you put the card back into the same camera with a charged battery. It doesn't happen every time, and we don't know in advance whether your ZV-E1 will do it for your clip, but it is free. After copying the card, charge the battery, put the card back into the same camera, switch on and wait. If a message about recovering data appears, let it finish and don't switch off. Then check the CLIP folder for a new .MP4.

Turn the .RSV into an MP4 on Windows

If the .RSV is still there, it needs a new index. Lazaclip is our Windows 10/11 program for exactly this (we make it, so this is our own product we are describing). It works offline and doesn't upload your video:

  1. Open the card or the folder you copied. The program shows each .RSV and whether it can be rebuilt.
  2. Click Preview 10 s: the first ten seconds of your clip, watermarked, open in your video player. The scan and preview are free.
  3. With a license, save the full video as an .MP4 on your PC and edit it like any other clip.

The video and audio are not re-encoded: the program keeps the recorded data as it is and only writes the missing index around it. The original .RSV stays untouched.

Has it been tested with the ZV-E1?

No, not yet. Our tests so far are on A7S III recordings (XAVC S, XAVC S-I and XAVC HS, rebuilt without a reference clip, with frames and audio identical to the original up to the last unfinished group of frames) and on the original a7S. The ZV-E1 uses the same XAVC S / XAVC HS recording format; the free preview shows whether the program can read your file before you pay.

What you get back

  • Everything up to the last second or so before the cut. That final moment was never completely written and can't be rebuilt.
  • Your original sound, from the camera's microphone or the mic you plugged in.
  • An .MP4 about the same size as the .RSV, so make sure your PC has the space.
  • If you recorded in XAVC HS, your editor or player needs H.265 support.

Making it less likely

  • Long 4K takes empty a battery quickly. Start them with a full one, or use external power with a cable that can't be pulled out by accident.
  • Don't pull the card or switch off until the camera has stopped recording and finished writing.
  • Carry a second SD card, so a card with an .RSV on it can be put aside without stopping your shoot.
  • In hot weather or long sessions, let the camera rest if it warns about temperature, rather than recording until it shuts down.

Also using a ZV-E10 II as a second camera? See the ZV-E10 II guide. For a full-frame body with two slots, the A7 IV guide.