Nikon video repair
Nikon video repair: what it usually means
Nikon video corruption may appear after battery loss, bad card removal, storage errors, or transfer interruptions. The file can retain data but lack the readable map players need.
If the file has real size, there may still be recoverable frames and audio inside. The safest first move is to leave the original untouched and create a separate repaired preview.
Do not trim, re-export, repeatedly convert, or overwrite the damaged file. If you need to experiment, work from a copy and keep the original exactly as it is.