Matroska, an open multimedia container supporting nearly any codec.
| 0x00000000 | 1A45DFA3 | ·E·· | EBML header |
The EBML DocType string near the start reads 'matroska'.
Matroska is a flexible open container that can hold virtually any video/audio codec plus multiple subtitle and chapter tracks, popular for high-quality video archives. It shares the EBML header with WebM but declares the DocType 'matroska'.
Have a file that might be Matroska? Identify it with the File Type Identifier — it reads the magic number locally, nothing is uploaded. Or browse all formats.