These tools ignore the file system index entirely. They scan raw sectors for MP4 headers ( ftyp ), AVI headers ( RIFF ), and AAC syncwords.
untrunc -f reference_working.mp4 corrupted_titanic.mp4 You need a similar working MP4 as a template for the header. Symptom: Media Player Classic shows "AVI index not found or broken. Rebuilding?"
| Cause | Description | Typical Error | |-------|-------------|----------------| | | Your browser or wget stopped at 98% | "moov atom not found" | | Fragmented Storage | HDD bad sectors or USB ejection | "Invalid index offset" | | Timestamp Clash | System clock changed after file copy | "Last modified > creation date" | | Codec Mismatch | WMA reported as AAC in the index | "Unsupported format" | | Corrupt Directory Index | The Index of / page listed wrong byte sizes | File plays partially then stops |
#!/bin/bash # Universal Titanic Index Fixer for file in *.mp4 *.avi .wma .aac; do ext="$file## ." base="$file%. " echo "Processing $file ..."
ffmpeg -i corrupted.aac -c copy -f adts fixed.aac Use MP4Box: