Video · Canon exFAT memory card
Canon XFVC: recover after an interrupted recording
What can I do with Canon XFVC clips and matching DAT extents after a recording interruption?
Short answer
Usually the media extent written before the failure exists, but the MP4 header may not describe it correctly. Switch the camera off, remove the card and preserve the full Canon folder structure unchanged. Rebuild only on a copy, with an intact clip from the same camera and recording mode as reference.
The situation
Canon XFVC clips and matching DAT extents is missing, too short or unreadable after power loss, a card error or an unsafe stop.
The camera stopped writing in the middle of a take. The media extent recorded up to that point exists on the card, but the MP4 header that should describe its length and structure was either never finished or does not match what was actually written.
01 / Diagnose
Work out what actually disappeared
In normal operation the camera closes the clip by writing the final header information once recording ends. A power loss or card error cuts that step, so the header still claims an older length while the DAT extent has grown beyond it. Editing software then reads a clip that is too short, or refuses the file outright.
The payload may have been written before duration fields, indexes, directory entries or closing structures were committed. For Canon XFVC, this matters because the MP4 header and recorded media extent may need to be matched by size and card layout
Check the last known path, trash and backups without writing to the original device.
02 / Protect the source
Preserve the best recovery chance
- 1
Switch the camera off, take the card out and preserve the Canon folder structure exactly as the interruption left it.
- 2
Duplicate the card or create an image of it, and let every repair attempt run against that duplicate only.
- 3
Record an intact reference clip on the same camera in the same mode, so a tool can compare header fields against a good example.
- 4
Repair on the copy, then keep the rebuilt clip and the untouched original on two different drives.
Do not use the camera's own card repair function on the original, and do not let an editor rewrite the clip in place to make it importable. A reference clip from another camera model or recording mode leads to a header that describes the wrong material.
03 / Choose the method
Match the tool to the source
For stable, readable exFAT, NTFS and FAT16/FAT32 or uncompressed IMG, DD, RAW and BIN images.
Unconfirmed exports are marked .UNVERIFIED.
Fixing a header to match an extent is repair work on a single file, which File Recovery Hero does not do; it recovers lost files from exFAT, NTFS and FAT media read-only. Where the extent itself was never written, no tool can supply the missing seconds.
04 / Verify
Check the recovered content, not just its name
A rebuilt clip should run as long as you were actually recording, right up to the moment the power failed, and hold picture and sound together to that point. Compare its header data with the reference clip: the codec, resolution and frame rate must be identical.
Keep the source until two verified copies exist. One working preview is not enough.
Sources and technical references
FAQ
Questions about this recovery case
Can Canon exFAT memory card be recovered in this situation?+
The camera stopped writing in the middle of a take. The media extent recorded up to that point exists on the card, but the MP4 header that should describe its length and structure was either never finished or does not match what was actually written. The result still depends on what remains readable on the source.
What should I avoid before scanning?+
Do not use the camera's own card repair function on the original, and do not let an editor rewrite the clip in place to make it importable.
Does scanning write to my memory card?+
Your memory card is only read. Nothing is saved to it.
How do I know whether the result is complete?+
A rebuilt clip should run as long as you were actually recording, right up to the moment the power failed, and hold picture and sound together to that point.