Vid_20221215_105814_430.mp4.mkv

If the original MP4 was corrupted (e.g., missing a "moov atom"), recovery software often outputs to MKV to stabilize the stream. 2. Forensic & Deep Feature Extraction

MKV files can store rich metadata that MP4s cannot, such as "Writing Application" (e.g., mkvmerge v70.0.0 ) or "Writing Library" (e.g., libebml ). This reveals which software handled the file after it left the phone. VID_20221215_105814_430.mp4.mkv

Tools like MKVToolNix often wrap MP4s into MKV to edit without re-encoding. If the original MP4 was corrupted (e