A true MKV file must start with the EBML header 1A 45 DF A3 . If the file fails to play, checking this header confirms if it's a genuine MKV or just a renamed MP4. 3. Practical Deep Inspection Steps
Use the command ffprobe -show_packets VID_20221215_105814_430.mp4.mkv to see if there are any dropped frames or timestamp gaps, which indicate the "health" of the video stream.
If you have access to the file, I recommend running these tools to see the "deep features" for yourself: 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
Likely a millisecond or sequence identifier used by the camera software to prevent naming collisions. A true MKV file must start with the EBML header 1A 45 DF A3
To truly analyze this file, you would look for the following internal "deep" characteristics:
This "double extension" suggests the original MP4 file was re-wrapped into a Matroska (MKV) container. This often happens during: Practical Deep Inspection Steps Use the command ffprobe
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