Video · VFR camera media
variable-frame-rate MP4: recover after an interrupted recording
What can I do with VFR MP4 camera clips after a recording interruption?
Short answer
Repair a copy, not the card: an interrupted VFR clip usually lacks the moov index that stores each frame's timestamp. Reference-based repair tools can rebuild playable video but may assume a fixed frame rate, so check whether picture and sound drift apart. Note the recording device and app to pick a matching reference clip.
The situation
VFR MP4 camera clips is missing, too short or unreadable after power loss, a card error or an unsafe stop.
An interrupted VFR recording loses more than its index. The moov atom holds the timestamp of every single frame, so when it is missing there is no record of how fast the camera was actually filming at each moment of the take.
01 / Diagnose
Work out what actually disappeared
Variable frame rate means the device changes capture speed while recording, for example when the light drops, and stores the presentation time for each frame at the end of the file. A power loss or a card error cuts the recording before that table is written. The frames survive; the information that would put them back on a timeline does not.
The payload may have been written before duration fields, indexes, directory entries or closing structures were committed. For variable-frame-rate MP4, this matters because timestamps rather than a fixed frame count define the presentation timeline
Check the last known path, trash and backups without writing to the original device.
02 / Protect the source
Preserve the best recovery chance
- 1
Power the device down cleanly and take the card out, or leave a phone alone until the file has been copied off.
- 2
Note the exact model and recording app, plus the mode used, so the reference clip really matches this footage.
- 3
Copy the clip to a disk and keep that copy untouched; every repair attempt runs on a further duplicate.
- 4
Shoot the reference in the same mode on the same device, then repair the duplicate and compare it with the reference.
Do not let the phone or camera clear its cache or repair the recording itself, and do not use an unrelated clip as a reference. A reference from another device or mode can force a fixed frame rate onto footage that was never filmed at one.
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.
File Recovery Hero exports files from stable exFAT, NTFS and FAT media read-only and does not rebuild a container or reconstruct per-frame timing. Repair tools can produce playable video with an approximated frame rate rather than the original one. Export needs the 50 € license.
04 / Verify
Check the recovered content, not just its name
Play the repaired copy with the audio turned on and follow a moving subject. Picture and sound that hold together to the end mean the rebuild fits. If the clip runs too fast or too slow, or sound leaves the picture behind, the tool assumed a constant rate the recording never used.
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 VFR camera media be recovered in this situation?+
An interrupted VFR recording loses more than its index. The moov atom holds the timestamp of every single frame, so when it is missing there is no record of how fast the camera was actually filming at each moment of the take. The result still depends on what remains readable on the source.
What should I avoid before scanning?+
Do not let the phone or camera clear its cache or repair the recording itself, and do not use an unrelated clip as a reference.
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?+
Play the repaired copy with the audio turned on and follow a moving subject.