March 4th 2025
We received an Apple watch audio recording file today, the file format is M4A and the size is 70MB, it shows 2 hours and 40 seconds on Apple watch,but only the first 4 seconds can be played on watch, and iPhone after sync by iCloud. The watch user told us the recording was corrupted due to the power off suddenly, she asked for help to restore the full audio recording.
We checked the hexadecimal code and found that the recording packaging technology was different from the normal M4A file, it has a very different structure, so the general technology could not fix it well. We spent some time on the media structure and made a new programming to repair the broken M4A file, it was fixed perfectly.