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How to convert a Sony .RSV file to MP4

People search for “RSV to MP4” because an MP4 is what the camera should have made. Here’s why a .RSV won’t play as it is, and how to turn it into a video you can edit.

Why renaming doesn’t work

While recording, Sony cameras write picture and sound into a temporary .RSV file. When you press stop, the camera writes an index (a table of where every frame and sound sample is) and renames the file to .MP4. If recording ends suddenly, that index is never written. Renaming the .RSV to .MP4 gives players a file with no index, so they refuse it or play nothing.

Rebuild instead of convert

The fix is to rebuild the missing index from the data that is there. RSV Rescue does this in your browser: it finds every frame and every sound block, works out their timing from the camera’s own settings and writes a fresh index around the original data. Nothing is re-encoded, so quality is identical to what the camera recorded.

  1. Drop the .RSV on rsvrescue.com.
  2. Watch the free preview.
  3. Pay once for that file and save the full video.

Why the result is .MOV, not .MP4

Sony records sound as uncompressed LPCM. The QuickTime .MOV format carries that sound natively in every major editor, so RSV Rescue saves a .MOV to keep the original sound bit-for-bit. It opens in Premiere Pro, Final Cut Pro, DaVinci Resolve, QuickTime and VLC. If a website or app insists on .MP4, export from your editor as usual once the clip is in your timeline.

Does it work for H.265 (XAVC HS) and 10-bit?

Yes. RSV Rescue handles XAVC S (H.264), XAVC HS (H.265) and XAVC S-I, in 8-bit and 10-bit, at any frame rate, including clips where the camera changed settings partway through.

Try the free preview → Drop your .RSV and watch the first 15 seconds of your recovered clip before you pay anything.